Who among the following scientists had no contribution in the development of the double helix model for the structure of DNA?
DNA has genetic properties was revealed for the first time by
The beginning of understanding genetic transformation in bacteria was made by
Transformation was discovered in Streptococcus pneumoniae in 1928 by Frederick Griffith; in 1944, Oswald T. Avery, Colin M. MacLeod, and Maclyn McCarty demonstrated that the “transforming principle” was DNA. Both results are milestones in the elucidation of the molecular nature of genes.
DNA contains nucleobases, sugar and phosphate. Removal of which among these from a DNA sample will not significantly affect the length of DNA?
According to Chargaff’s rule, which one is correct?
According to Chargaff’s rule in all cellular DNA, regardless of the species, number of adenosine residues is equal to the number of thymidine residues which means that A = T and the number of guanosine residues is equal to the number of cytidine residues; G = C . Hence, that the sum of the purine residues equals the sum of the pyrimidine residues; i.e., A + G = T + C.
Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a triplet?
In Hershey and Chase experiments, radioactive 32P was used to culture bacteriophages which resulted in radioactive
In Hershey and Chase experiment, some bacteriophage viruses where grown in a medium which contained radioactive phosphorus(32P) and some in radioactive sulphur(35S) medium. Viruses grown under radioactive (32P) contained radioactive DNA and Viruses grown under radioactive (35S) contained radioactive protein. When infected in E.coli separately, bacterial cells were gently agitated in blender to remove viralcoats from the bacteria. Culture was also centrifuged. Radioactive 32P was found to be associated with the bacterial cell whereas Radioactive 35S was found in the surrounding medium. Hence, the process resulted in viral DNA.
Which of the following is a structural subunit of DNA?
Nucleotides are organic molecules that serve as the monomers, or subunits, of nucleic acids like DNA and RNA. The building blocks of nucleic acids, nucleotides are composed of a nitrogenous base, a five-carbon sugar and at least one phosphate group.
Which of the following are the functions of RNA?
mRNA carries genetic information from DNA to ribosomes for synthesising polypeptide chains. tRNA carries amino acids to mRNA for translation. rRNA is a vital component of ribosomes.
While analysing the DNA of an organism, a total number of 5386 nucleotides were found out of which the proportion of different bases were Adenine = 29%, Guanine = 17%, Cytosine = 32% and Thymine = 17%. Considering the Chargaff’s rule, it can be concluded that
In the DNA of an organism a total number of 5386 nucleotides were found out of which the proportion of different bases were: Adenine = 29%, Guanine = 17%, Cytosine = 32%, Thymine = 17%. Considering the Chargaff’s rule it can be concluded that it is a single stranded DNA.
Nitrogenous bases present in DNA:
Beadle and Tatum showed that each kind of mutant bread mould they studied lacked a specific enzyme. Their experiments demonstrated that
Beadle and Tatum proposed their one gene one enzyme hypothesis on the basis of biochemical genetics in Neurospora crassa. Beadle and Tatum showed that each kind of mutant bread mould lacke a specific enzyme. Their experiments demonstrated that genes carry information for making proteins.
A typical nucleosome contains
Nucleosomes can be said when the DNA is wrapped around the histone protein, so this structure is called nucleosome and it has 200 base pairs of the DNA helix.
Which one of the following is a base analogue
5-bromo uracil (Bu) is base analogue of thymine. Transitions are caused by base analogues.
In the DNA molecule,