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All questions of Chapter 6 - Molecular Basis of Inheritance for NEET Exam
Transformation was discovered by: [2014]- a)Meselson and Stahl
- b)Hershey and Chase
- c)Griffith
- d)Watson and Crick
Correct answer is option 'C'. Can you explain this answer?
Transformation was discovered by: [2014]
a)
Meselson and Stahl
b)
Hershey and Chase
c)
Griffith
d)
Watson and Crick
|
Yash Saha answered |
(c) Frederick Griffith (in 1928), a British Medical officer described the phenomenon of bacterial transformation. He carried out experiment with Streptococcus pneumoniae (bacterium causing pneumonia) which is used to infect mice. By using S Strain (heat killed) and R strain (live) it was concluded that R strain has been transformed by some material of S strain which makes R strain virulent and enable to synthesize smooth polysachharide.
Which one of the following is wrongly matched? [2014]- a)Transcription – Writing information from DNA to tRNA.
- b)Translation – Using information in mRNA to make protein
- c)Repressor protein – Binds to operator to stop enzyme synthesis.
- d)Operon – Structural genes, operator and promoter
Correct answer is option 'A'. Can you explain this answer?
Which one of the following is wrongly matched? [2014]
a)
Transcription – Writing information from DNA to tRNA.
b)
Translation – Using information in mRNA to make protein
c)
Repressor protein – Binds to operator to stop enzyme synthesis.
d)
Operon – Structural genes, operator and promoter
|
Aman Sharma answered |
(a) Process of copying genetic information from DNA to RNA is called transcription. At a time only one DNA strand is being transcribed into RNA. The strand of DNA with polarity 3' → 5' act as template strand and the DNA strand with polarity 5' → 3' act as coding strand.
Jacob and Monod studied lactose metabolism in E.coli and proposed operon concept. Operon concept is applicable for[2002]- a)all prokaryotes
- b)all prokaryotes and some eukaryotes
- c)all prokaryotes and all eukaryotes
- d)all prokaryotes and some protozoans
Correct answer is option 'B'. Can you explain this answer?
Jacob and Monod studied lactose metabolism in E.coli and proposed operon concept. Operon concept is applicable for
[2002]
a)
all prokaryotes
b)
all prokaryotes and some eukaryotes
c)
all prokaryotes and all eukaryotes
d)
all prokaryotes and some protozoans
|
Nilanjan Chakraborty answered |
Gene regulation of eukaryotes is complex as compared to that of prokaryotes.
Commonly used vectors for human genome sequencing are: [2014]- a)T-DNA
- b)BAC and YAC
- c)Expression Vectors
- d)T/A Cloning Vectors
Correct answer is option 'B'. Can you explain this answer?
Commonly used vectors for human genome sequencing are: [2014]
a)
T-DNA
b)
BAC and YAC
c)
Expression Vectors
d)
T/A Cloning Vectors
|
Anirudh Datta answered |
(b) Human genome sequencing is a process that determines the complete DNA sequence of an organism's genome at a single time. This requires sequencing all of an organism's chromosomal DNA as well as DNA contained in the mitochondria and, for plants, in the chloroplast. Commonly used vectors for human genome sequencing are BAC (Bacterial artificial chromosomes) and YAC (Yeast artificial chromosomes).
An abnormal human baby with 'XXX' sex chromosomes was born due to- a)formation of abnormal sperms in the father
- b)formation of abnormal ova in the mother
- c)fusion of two ova and one sperm
- d)fusion of two sperms and one ovum
Correct answer is option 'B'. Can you explain this answer?
An abnormal human baby with 'XXX' sex chromosomes was born due to
a)
formation of abnormal sperms in the father
b)
formation of abnormal ova in the mother
c)
fusion of two ova and one sperm
d)
fusion of two sperms and one ovum
|
Mrinalini Bajaj answered |
Alleles are different molecular forms of a gene, representing altemate forms of a given character.
Height of a pea plant-T for tallness and t for dwarfness.
T and t are altemate forms for given character of height.
Heterozygotes and homozygotes refers to inheritance of two different and similar travels for a character respectively.
A complex of ribosomes attached to a single strand of RNA is known as [2016]- a)Polysome
- b)Polymer
- c)Polypeptide
- d)Okazaki fragment
Correct answer is option 'A'. Can you explain this answer?
A complex of ribosomes attached to a single strand of RNA is known as [2016]
a)
Polysome
b)
Polymer
c)
Polypeptide
d)
Okazaki fragment
|
Dipika Das answered |
(a) A polysome or polyribosome is a complex of an mRNA molecule and two or more ribosomes, which is formed during the active translation process. They were initially named as ergosomes in 1963. However, further research by Jonathan Warner and Alex Rich characterized polysome.
A pleiotropic gene: [2015 RS]- a)is a gene evolved during Pliocene.
- b)controls a trait only in combination with another gene
- c)controls multiple traits in an individual.
- d)is expressed only in primitive plants
Correct answer is option 'C'. Can you explain this answer?
A pleiotropic gene: [2015 RS]
a)
is a gene evolved during Pliocene.
b)
controls a trait only in combination with another gene
c)
controls multiple traits in an individual.
d)
is expressed only in primitive plants
|
Arindam Khanna answered |
(c) A pleiotropic gene regulates multiple traits (characte- ristics) in an individual.
In a DNA percentage of thymine is 20% then what will be the percentage of guanine?[2002]- a)20%
- b)40%
- c)30%
- d)60%
Correct answer is option 'C'. Can you explain this answer?
In a DNA percentage of thymine is 20% then what will be the percentage of guanine?
[2002]
a)
20%
b)
40%
c)
30%
d)
60%
|
Tejas Chavan answered |
According to Chargaff's rule, the ratio of purine bases to pyrimidine bases is equal.
A = T, C = G.
If T is 20% then A is 20% and C and G are 30%, 30%.
A = T, C = G.
If T is 20% then A is 20% and C and G are 30%, 30%.
In E.coli during lactose metabolism repressor binds to[2002]- a)regulator gene
- b)operator gene
- c)structural gene
- d)promoter gene
Correct answer is option 'B'. Can you explain this answer?
In E.coli during lactose metabolism repressor binds to
[2002]
a)
regulator gene
b)
operator gene
c)
structural gene
d)
promoter gene
|
Vaibhav Basu answered |
Regulator gene for ms a biochemical for suppressing the activity of operator gene. Promoter gene is the gene which provides point of attachment to RNA polymerase required for transcription of structural genes. Structural genes are genes which transcribe m RNA for polypeptide synthesis.
The number of base substitution possible in amino acid codons is[1994]- a)261
- b)264
- c)535
- d)549
Correct answer is option 'D'. Can you explain this answer?
The number of base substitution possible in amino acid codons is
[1994]
a)
261
b)
264
c)
535
d)
549
|
Sarthak Saini answered |
Codons are 6 in number. Each codon possess 3 bases, each of which can undergo transition and transversion. (1 × 32 = 549)
Which of the following important biochemical reactions in living systems is catalyzed by a ribozyme?
a)Formation of peptide bondb)Repair of DNAc)Electron transfer chaind)Organization of MTOC during cell divisonCorrect answer is option 'A'. Can you explain this answer?
|
Gaurav Kumar answered |
In prokaryotes (bacteria) the 23srRNA of the larger subunit of ribosome is the enzyme ribozyme that catalyzes peptide bond formation.
Hence, the correct option is A.
NCERT Reference: Page no. 115 of topic “6.7 TRANSLATION” of chapter 6.
NCERT Reference: Page no. 115 of topic “6.7 TRANSLATION” of chapter 6.
The chromosomes in which centromere is situated close to one end are: [2015 RS]- a)Acrocentric
- b)Telocentric
- c)Sub-metacentric
- d)Metacentric
Correct answer is option 'A'. Can you explain this answer?
The chromosomes in which centromere is situated close to one end are: [2015 RS]
a)
Acrocentric
b)
Telocentric
c)
Sub-metacentric
d)
Metacentric
|
|
Aman Sharma answered |
(a) In acrocentric chromosomes, one arm is very short but another is long.
In sea urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are :- [2015 RS]- a)G 17%, A 16.5%, T 32.5%
- b)G 17%, A 33%, T 33%
- c)G 8.5%, A 50%, T 24.5%
- d)G 34%, A 24.5%, T 24.5%
Correct answer is option 'B'. Can you explain this answer?
In sea urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are :- [2015 RS]
a)
G 17%, A 16.5%, T 32.5%
b)
G 17%, A 33%, T 33%
c)
G 8.5%, A 50%, T 24.5%
d)
G 34%, A 24.5%, T 24.5%
|
Diya Datta answered |
(b) Chargaff's rule states that A = T and G º C. The molar amount of adenine = molar amount of thymine. The molar amount of guanine = molar amount of cytosine. Hence, G is 17%, so, C = 17% A = 33%, so, T = 33%
Which one of the following triplet codes, is correctly matched with its specificity for an amino acid in protein synthesis or as ‘start’ or ‘stop’codon ?[2003]- a)UAC – Tyrosine
- b)UCG – Start
- c)UUU – Stop
- d)UGU – Leucine
Correct answer is option 'A'. Can you explain this answer?
Which one of the following triplet codes, is correctly matched with its specificity for an amino acid in protein synthesis or as ‘start’ or ‘stop’codon ?
[2003]
a)
UAC – Tyrosine
b)
UCG – Start
c)
UUU – Stop
d)
UGU – Leucine
|
Palak Khanna answered |
AUG is initiating codon. UCG codes for serine, UUU codes for phenylalan, UGU codes for cysteine.
Which of the following is not required for any of the techniques of DNA fingerprinting available at present ? [2016]- a)Polymerase chain reaction
- b)Zinc finger analysis
- c)Restriction enzymes
- d)DNA-DNA hybridization
Correct answer is option 'B'. Can you explain this answer?
Which of the following is not required for any of the techniques of DNA fingerprinting available at present ? [2016]
a)
Polymerase chain reaction
b)
Zinc finger analysis
c)
Restriction enzymes
d)
DNA-DNA hybridization
|
Pooja Choudhary answered |
(b) Zinc-finger analysis is used for protein analysis. The zinc finger proteins are a super family of proteins involved in numerous activities of plant growth and development.
Khorana first deciphered the triplet codons of[1992]- a)serine and isoleucine
- b)cysteine and valine
- c)tyrosine and tryptophan
- d)phenylalanine and methionine
Correct answer is option 'B'. Can you explain this answer?
Khorana first deciphered the triplet codons of
[1992]
a)
serine and isoleucine
b)
cysteine and valine
c)
tyrosine and tryptophan
d)
phenylalanine and methionine
|
Rohit Jain answered |
Hargonind Khurana first deciphered the triplet codon of cysteine and valine.
Who proved that DNA is basic genetic material?[1993]- a)Griffith
- b)Watson
- c)Boveri and Sutton
- d)Hershey and Chase
Correct answer is option 'D'. Can you explain this answer?
Who proved that DNA is basic genetic material?
[1993]
a)
Griffith
b)
Watson
c)
Boveri and Sutton
d)
Hershey and Chase
|
Preeti Iyer answered |
Hershey and Chase did two experiments to prove that DNA is the carrier of the genetic information. First, they grew phages (viruses which infect bacteria) in a medium containing radioactive sulphur (35^S). This marked all the proteins of the phage (the hull) radioactive. They then used this phage to infect bacteria.
Which one of the following also acts as a catalyst in a bacterial cell ?[2011]- a)5 sr RNA
- b)sn RNA
- c)hn RNA
- d)23 sr RNA
Correct answer is option 'D'. Can you explain this answer?
Which one of the following also acts as a catalyst in a bacterial cell ?
[2011]
a)
5 sr RNA
b)
sn RNA
c)
hn RNA
d)
23 sr RNA
|
Abhishek Choudhary answered |
23sr RNA acts as a catalyst in a bacterial cell.
Frequency of an allele in a isolated population may change due to[2001]- a)genetic Drift
- b)gene flow
- c)mutation
- d)natural selection
Correct answer is option 'A'. Can you explain this answer?
Frequency of an allele in a isolated population may change due to
[2001]
a)
genetic Drift
b)
gene flow
c)
mutation
d)
natural selection
|
Soumya Ahuja answered |
Mutations are sudden inheritable variations which develop in the genetic system. Natural selection operates through differential reproduction.
DNA replication is[1989, 2000]- a)conservative and discontinuous
- b)semiconservative and semi discontinuous
- c)semiconservative and discontinuous
- d)conservative
Correct answer is option 'B'. Can you explain this answer?
DNA replication is
[1989, 2000]
a)
conservative and discontinuous
b)
semiconservative and semi discontinuous
c)
semiconservative and discontinuous
d)
conservative
|
Anu Bajaj answered |
In semi conservative replication of DNA in each replica one half is the old strand and the other half is a new strand synthesized over it.
How many base pairs (bp) are found in the haploid genome of humans?[1999]- a)2.9 × 109
- b)4 × 108
- c)7 × 109
- d)3 × 109
Correct answer is option 'A'. Can you explain this answer?
How many base pairs (bp) are found in the haploid genome of humans?
[1999]
a)
2.9 × 109
b)
4 × 108
c)
7 × 109
d)
3 × 109
|
|
Rohit Shah answered |
Three billion
Haploid human genomes, which are contained in germ cells (the egg and sperm gamete cells created in the meiosis phase of sexual reproduction before fertilization creates a zygote) consist of three billion DNA base pairs, while diploid genomes (found in somatic cells) have twice the DNA content.
Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?[2008]- a)Thymine, Uracil - Pyrimidines
- b)Uracil, Cytosine - Pyrimidines
- c)Guanine, Adenine - Purines
- d)Adenine, Thymine - Purines
Correct answer is option 'D'. Can you explain this answer?
Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?
[2008]
a)
Thymine, Uracil - Pyrimidines
b)
Uracil, Cytosine - Pyrimidines
c)
Guanine, Adenine - Purines
d)
Adenine, Thymine - Purines
|
Lekshmi Banerjee answered |
Purine is an organic nitrogenous base sparingly soluble in water, that gives rise to a group of biologically important derivatives, notably adenine and guanine, which occur in nucleotides and nucleic acids (DNA and RNA).
A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings ? [2015 RS]- a)A,B and AB only
- b)A,B,AB and O
- c)O only
- d)A and B only
Correct answer is option 'B'. Can you explain this answer?
A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings ? [2015 RS]
a)
A,B and AB only
b)
A,B,AB and O
c)
O only
d)
A and B only
|
Shruti Chauhan answered |
(b) Possible × Possible genotype genotype of man with blood of woman with group A blood group B I A IA, IA IO × IB IB, IB IO If the genotype is I A IO × IB IO The possibility of resultant blood group may be A, B, AB and O.
Removal of introns and joining the exons in a defined order in a transcription unit is called:[2009]- a)tailing
- b)transformation
- c)capping
- d)splicing
Correct answer is option 'D'. Can you explain this answer?
Removal of introns and joining the exons in a defined order in a transcription unit is called:
[2009]
a)
tailing
b)
transformation
c)
capping
d)
splicing
|
Ayush Choudhury answered |
Splicing is the removal of introns and joining the exons in a defined order in a transcription unit. In molecular biology, splicing is a modification of RNA after transcription, in which introns are removed and exons are joined.
Which one of the following is not applicable to RNA? [2015 RS]- a)5' phosphoryl and 3' hydroxyl ends
- b)Heterocyclic nitrogenous bases
- c)Chargaff's rule
- d)Complementary base pairing
Correct answer is option 'C'. Can you explain this answer?
Which one of the following is not applicable to RNA? [2015 RS]
a)
5' phosphoryl and 3' hydroxyl ends
b)
Heterocyclic nitrogenous bases
c)
Chargaff's rule
d)
Complementary base pairing
|
Priyanka Iyer answered |
(c) Chargaff's rule is not applicable to RNA
In split genes, the coding sequences are called[1995]- a)introns
- b)operons
- c)exons
- d)cistrons
Correct answer is option 'C'. Can you explain this answer?
In split genes, the coding sequences are called
[1995]
a)
introns
b)
operons
c)
exons
d)
cistrons
|
Rajeev Sharma answered |
The region of a gene, which becomes part of m-RNA and code for different regions of the proteins are called exons.
Trans for mation experiment was first performed on which bacteria?[2002]- a)E.coli
- b)Diplococcus pneumoniae
- c)Salmonella
- d)Pasteurella pestis
Correct answer is option 'B'. Can you explain this answer?
Trans for mation experiment was first performed on which bacteria?
[2002]
a)
E.coli
b)
Diplococcus pneumoniae
c)
Salmonella
d)
Pasteurella pestis
|
|
Rajeev Sharma answered |
Transfor mation is change in genetic material of an organism by obtaining genes from outside.
Multiple alleles are present : [2015 RS]- a)At different loci on the same chromosome
- b)At the same locus of the chromosome
- c)On non-sister chromatids
- d)On different chromosomes
Correct answer is option 'B'. Can you explain this answer?
Multiple alleles are present : [2015 RS]
a)
At different loci on the same chromosome
b)
At the same locus of the chromosome
c)
On non-sister chromatids
d)
On different chromosomes
|
Krish Patel answered |
(b) All alleles of a gene are situated on the same loci of chromosome in organisms.
Gene regulation governing lactose operon of E.coli that involves the lac I gene product is : [2015 RS]- a)Negative and inducible because repressor protein prevents transcription
- b)Negative and repressible because repressor protein prevents transcription
- c)Feedback inhibition because excess of bgalactosidase can switch off trascription
- d)Positive and inducible because it can be induced by lactose
Correct answer is option 'A'. Can you explain this answer?
Gene regulation governing lactose operon of E.coli that involves the lac I gene product is : [2015 RS]
a)
Negative and inducible because repressor protein prevents transcription
b)
Negative and repressible because repressor protein prevents transcription
c)
Feedback inhibition because excess of bgalactosidase can switch off trascription
d)
Positive and inducible because it can be induced by lactose
|
|
Raza Great answered |
In negative inducible operons, a regulatory repressor protein is normally bound to the operator, which prevents the transcription of the genes in the operon. If an inducer molecule is present, it binds to the repressor and changes its conformation so that it is unable to bind to the operator. This allows for expression of the operon. The lac operon is a negatively controlled inducible operon, where the inducer molecule is allolactose
The movement of a gene from one linkage group to another is called : [2015 RS]- a)Duplication
- b)Translocation
- c)Crossing over
- d)Inversion
Correct answer is option 'B'. Can you explain this answer?
The movement of a gene from one linkage group to another is called : [2015 RS]
a)
Duplication
b)
Translocation
c)
Crossing over
d)
Inversion
|
Harshitha Dey answered |
(b) In translocation, the movement of a gene takes place from one linkage group to another between non-homologous chromosomes.
A gene showing codominance has: [2015 RS]- a)alleles tightly linked on the same chromosome
- b)alleles that are recessive to each other
- c)both alleles independently expressed in the heterozygote
- d)one allele dominant on the other
Correct answer is option 'C'. Can you explain this answer?
A gene showing codominance has: [2015 RS]
a)
alleles tightly linked on the same chromosome
b)
alleles that are recessive to each other
c)
both alleles independently expressed in the heterozygote
d)
one allele dominant on the other
|
|
Diya Datta answered |
(c) In codominance both alleles are independently expressed in the heterozygote
The process of transfer of genetic information from DNA to RNA/formation of RNA from DNA is[1991]- a)transversion
- b)transcription
- c)translation
- d)translocation
Correct answer is option 'B'. Can you explain this answer?
The process of transfer of genetic information from DNA to RNA/formation of RNA from DNA is
[1991]
a)
transversion
b)
transcription
c)
translation
d)
translocation
|
Mamali . answered |
Transcription is the first step of gene expression, in which a particular segment of DNA is copied into RNA (especially mRNA) by the enzyme RNA polymerase. Both DNA and RNA are nucleic acids, which use base pairsof nucleotides as a complementary language. During transcription, a DNA sequence is read by an RNA polymerase, which produces a complementary, antiparallel RNA strand called a primary transcript....
Genetic code consists of[1988]- a)cdenine and guanine
- b)cytosine and uracil
- c)cytosine and guanine
- d)all the above
Correct answer is option 'D'. Can you explain this answer?
Genetic code consists of
[1988]
a)
cdenine and guanine
b)
cytosine and uracil
c)
cytosine and guanine
d)
all the above
|
Kunal Rane answered |
Genetic code is the relationship of amino acid sequence in a polypeptide chain and base sequence of mRNA. It includes adenine, guanine, cytosine and thymine.
The wild type E. coli cells are growing in normal medium with glucose. They are transferred to a medium containing only lactose as sugar. Which of the following changes takes place? [1995]- a)The lac operon is repressed
- b)All operons are induced
- c)The lac operon is induced
- d)E.coli cells stop dividing
Correct answer is option 'C'. Can you explain this answer?
The wild type E. coli cells are growing in normal medium with glucose. They are transferred to a medium containing only lactose as sugar. Which of the following changes takes place?
[1995]
a)
The lac operon is repressed
b)
All operons are induced
c)
The lac operon is induced
d)
E.coli cells stop dividing
|
|
Lekshmi Banerjee answered |
If Escherichia coli bacteria grow in normal glucose medium and when transferred to a medium containing lactose, then the lac operon is induced.
At time of organogenesis genes regulate the process at different levels and at different time due to[2001]- a)promoter
- b)Exon
- c)intron
- d)Regulator
Correct answer is option 'B'. Can you explain this answer?
At time of organogenesis genes regulate the process at different levels and at different time due to
[2001]
a)
promoter
b)
Exon
c)
intron
d)
Regulator
|
|
Ramesh Chand answered |
In process of organogenesis, genes regulate the process at different time and levels because of Exon. An exon is the region that has useful information. Exon are the one with useful information while introns are removed from DNA by various enzymes. Therefore, option 'B' is the correct answer.
Escherichia coli fully labelled with 15N is allowed to grow in 14N medium. The two strands of DNA molecule of the first generation bacteria have[1992]- a)different density and do not resemble parent DNA
- b)different density but resemble parent DNA
- c)same density and resemble parent DNA
- d)same density but do not resemble parent DNA
Correct answer is option 'A'. Can you explain this answer?
Escherichia coli fully labelled with 15N is allowed to grow in 14N medium. The two strands of DNA molecule of the first generation bacteria have
[1992]
a)
different density and do not resemble parent DNA
b)
different density but resemble parent DNA
c)
same density and resemble parent DNA
d)
same density but do not resemble parent DNA
|
Maheshwar Saini answered |
After one generation in 14N medium DNA of bacteria settled at a level intermediate between heavy and light bands due to semi conservative DNA replication.
Which one of the following is the starter codon? [2016]- a)AUG
- b)UGA
- c)UAA
- d)UAG
Correct answer is option 'A'. Can you explain this answer?
Which one of the following is the starter codon? [2016]
a)
AUG
b)
UGA
c)
UAA
d)
UAG
|
|
Aman Sharma answered |
(a) The start codon is the first codon of a messenger RNA (mRNA) transcript translated by a ribosome. The start codon always codes for methionine in eukaryotes and a modified Met (fMet) in prokaryotes. The most common start codon is AUG
What base is responsible for hot spots for spontaneous point mutations?[1998]- a)Adenine
- b)5-bromouracil
- c)5-methylcytosine
- d)Guanine
Correct answer is option 'C'. Can you explain this answer?
What base is responsible for hot spots for spontaneous point mutations?
[1998]
a)
Adenine
b)
5-bromouracil
c)
5-methylcytosine
d)
Guanine
|
Subhankar Datta answered |
The term "hot spots" was used by Benzer for the sites which are more mutable than other sites. Studies in 1978 revealed that 5-methylcytosine residues occur at the position of each hot spot.
The lac operon is an example of[1995]- a)arabinose operon
- b)inducible operon
- c)repressible operon
- d)overlapping genes
Correct answer is option 'B'. Can you explain this answer?
The lac operon is an example of
[1995]
a)
arabinose operon
b)
inducible operon
c)
repressible operon
d)
overlapping genes
|
|
Dasari Pragna answered |
In the lac operon the inducer binds to the repressor RNA produced by I gene so the lac operon is in actived when the inducer binds to it so it is the example of inducible operon
In the DNA molecule[2008]- a)the total amount of purine nucleotides and pyrimidine nucleotides is not always equal
- b)there are two strands which run parallel in the 5′ → 3′ direction
- c)the proportion of Adenine in relation to thymine varies with the organism
- d)there are two strands which run anti parallel one in 5′ → 3′ direction and other in 3′ → 5′
Correct answer is option 'D'. Can you explain this answer?
In the DNA molecule
[2008]
a)
the total amount of purine nucleotides and pyrimidine nucleotides is not always equal
b)
there are two strands which run parallel in the 5′ → 3′ direction
c)
the proportion of Adenine in relation to thymine varies with the organism
d)
there are two strands which run anti parallel one in 5′ → 3′ direction and other in 3′ → 5′
|
Subham Chavan answered |
In the DNA molecule, there are two strands which run anti parallel one is 5' - 3' direction and other in 3' -5' direction, the two chains are held together by hydrogen bonds between their bases. Adenine (A), a purine of one chain his exactly opposite thymine (T), a pyramidine of the other chain. Similarly, cytosine (C), a pyrimidine lies opposite guanine (G), a purine. This allows a sort of lock & key arrangment between large sized purine & small sized pyrimidine. It is strengthened by the appearance of hydrogen bonds between the two.
Semi-conservative replication of DNA was first demonstrated in:[2009]- a)Escherichia coli
- b)Streptococcus pneumoniae
- c)Salmonella typhimurium
- d)Drosophila melanogaster
Correct answer is option 'A'. Can you explain this answer?
Semi-conservative replication of DNA was first demonstrated in:
[2009]
a)
Escherichia coli
b)
Streptococcus pneumoniae
c)
Salmonella typhimurium
d)
Drosophila melanogaster
|
|
Harshitha Dey answered |
Semiconservative replication of DNA was first demonstrated in Escherichia coli. E. coli is a common type of bacteria that can get into food, like beef and vegetables. The strange thing about these bacteria is that they are not always harmful to you. E. coli normally lives inside your intestines, where it helps your body breakdown and digest the food you eat.
DNA template sequence of CTGATAGC is transcribed over mRNA as[1994, 95, 2004]- a)GUCTUTCG
- b)GACUAUCG
- c)GAUTATUG
- d)UACTATCU
Correct answer is option 'B'. Can you explain this answer?
DNA template sequence of CTGATAGC is transcribed over mRNA as
[1994, 95, 2004]
a)
GUCTUTCG
b)
GACUAUCG
c)
GAUTATUG
d)
UACTATCU
|
|
Tejas Chavan answered |
During transcription, from the DNA template complementary mRNA is formed and thymine is replaced by uracil.
A DNA with unequal nitrogen bases would most probably be[1993]- a)single stranded
- b)double stranded
- c)triple stranded
- d)four stranded
Correct answer is option 'A'. Can you explain this answer?
A DNA with unequal nitrogen bases would most probably be
[1993]
a)
single stranded
b)
double stranded
c)
triple stranded
d)
four stranded
|
Anjali Iyer answered |
A DNA with unequal nitrogen bases would most probably be single stranded because unequal nitrogen bases can not make bonds to form double strand.
In transgenics, expression of transgene in target tissue is determined by
[2004]
- a)enhancer
- b)promoter
- c) reporter
- d)transgene
Correct answer is option 'B'. Can you explain this answer?
In transgenics, expression of transgene in target tissue is determined by
[2004]
a)
enhancer
b)
promoter
c)
reporter
d)
transgene
|
|
Raza Great answered |
In a transgenic organism, reporter genes are used to determine whether a particular DNA construct has been successfully introduced into a cell, organ or tissue. Whereas promoter is the region of DNA that initiates the DNA transcription, an enhancer is the sequence of DNA that enhances the transcription when binds to the specific proteic and transgene is the gene that taken from the genome of one organism and introduces into the genome of another organism.
The Pneumococcus experiment proves that[1999]- a)DNA is the genetic material
- b)Bacteria undergo binary fission
- c)Bacteria do not reproduce sexually
- d)RNA sometime controls the production of DNA and proteins
Correct answer is option 'A'. Can you explain this answer?
The Pneumococcus experiment proves that
[1999]
a)
DNA is the genetic material
b)
Bacteria undergo binary fission
c)
Bacteria do not reproduce sexually
d)
RNA sometime controls the production of DNA and proteins
|
|
Subhankar Datta answered |
Griffith’s experiment with Pneumococcus proves that DNA is the genetic material.
Gene and cistron words are sometimes used synonymously because[2001]- a)one cistron contains many genes
- b)one gene contains many cistrons
- c)one gene contains one cistron
- d)one gene contains no cistron
Correct answer is option 'C'. Can you explain this answer?
Gene and cistron words are sometimes used synonymously because
[2001]
a)
one cistron contains many genes
b)
one gene contains many cistrons
c)
one gene contains one cistron
d)
one gene contains no cistron
|
Ayush Chavan answered |
Cistron is that segment of DNA which specifies synthesis of a polypeptide.
A mutation at one base of the first codon, of a gene, produces a non-functional protein. Such a mutation is called[1997]- a)nonsense mutation
- b)missense mutation
- c)frameshift mutation
- d)reverse mutation
Correct answer is option 'B'. Can you explain this answer?
A mutation at one base of the first codon, of a gene, produces a non-functional protein. Such a mutation is called
[1997]
a)
nonsense mutation
b)
missense mutation
c)
frameshift mutation
d)
reverse mutation
|
|
Rohan Singh answered |
A mutation at one base of the first codon of a gene produces a non-functional protein. Such a mutation is known as missense mutation. Hence,option (b) is correct.
Hope this information will clear your doubts about the topic.
Satellite DNA is useful tool in:[2010]- a)organ transplantation
- b)sex determination
- c)forensic science
- d)genetic engineering
Correct answer is option 'C'. Can you explain this answer?
Satellite DNA is useful tool in:
[2010]
a)
organ transplantation
b)
sex determination
c)
forensic science
d)
genetic engineering
|
|
Lekshmi Banerjee answered |
Satellite DNA is useful in forensic science. The polymorphism of minisatellite, microsatellite and minivariant repeats is analysed for DNA finger printing, DNA profiling. It helps in the resolution of crimes, legal disputes etc.
The term 'linkage' was coined by : [2015 RS]- a)T. Boveri
- b)G. Mendel
- c)W. Sutton
- d)T.H. Morgan
Correct answer is option 'D'. Can you explain this answer?
The term 'linkage' was coined by : [2015 RS]
a)
T. Boveri
b)
G. Mendel
c)
W. Sutton
d)
T.H. Morgan
|
|
Subham Chavan answered |
(d) Thomas Hunt Morgan won the Nobel Prize (1933) in physiology or medicine for the function of chromosomes in heredity
Chapter doubts & questions for Chapter 6 - Molecular Basis of Inheritance - Biology 31 Years NEET/AIPMT Question Papers of Class 12 2025 is part of NEET exam preparation. The chapters have been prepared according to the NEET exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for NEET 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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Biology 31 Years NEET/AIPMT Question Papers of Class 12
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