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Test: Biomolecules 4 - From Past 28 Years Questions


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25 Questions MCQ Test Biology 31 Years NEET Chapterwise Solved Papers | Test: Biomolecules 4 - From Past 28 Years Questions

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Test: Biomolecules 4 - From Past 28 Years Questions - Question 1

In double helix of DNA, the two DNA strands are

[1988]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 1

The two chains comprising the DNA are sprially coiled around a common axis to form a regular, right handed double helix.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 2

RNA does not possess

[1988]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 2

In RNA, pyrimidine thymine is replaced by uracil.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 3

Which is not consistent with double helical structure of DNA ?

[1990]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 3

The ratios  for the (A+ G)/ (T+C) are constant at approximately  1.0 for the different organisms. Each of these organisms contains a double  stranded genome. The percentage of Guanine and Cytosine are almost equal to each other, similarly the percentages of Adenine and Thymine are almost equal to each other as well. In other words, the percentage of purines should be equal to the percentage of pyrimidines for double stranded  DNA. This means that (A + G) = (C + T)
The (A+T) / (C + G) ratios are not constant. The relative numbers of (A + T) base pairs and (G + C) base pairs are unique to each organism and can  vary between the different species.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 4

A nucleotide is formed of

[1991, 05]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 4

The nucleic acid (DNA and RNA) are repeating units of nucleotides i.e. polynucleotides. Each nucleotide comprises of nitrogenous heterocyclic bases viz. purines or pyrimidi

Test: Biomolecules 4 - From Past 28 Years Questions - Question 5

Mineral associated with cytochrome is

[1991]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 5

Cytochromes are a type of chromoproteins. Chromoproteins are conjugated proteins which are composed of a protein molecule joined to nonprotein group (Prosthetic group).

Test: Biomolecules 4 - From Past 28 Years Questions - Question 6

In RNA, thymine is replaced by

[1991, 92]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 6

RNA is a single chain of ribonucleotides. Each ribonucleotide consists of nitrogenous bases (adenine, guanine, cytosine and uracil), ribose sugar and phosphoric acid.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 7

The basic unit of nucleic acid is

[1991]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 7

Nucleic acid (DNA and RNA) comprises of polynucleotides. Each nucleotide consist of nitrogenous bases, pentose sugar and phosphoric acid.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 8

A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is

[1991]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 8

According to Chargaff ’s rule, the amount of adenine is always equal to thymine and that of guanine equal to cytosine. Moreover, A + G = T + C.
120 + 120 = 120 + 120
240 = 240
So there will be 480 nucleotides in all.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 9

DNA is composed of repeating units of

[1991]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 9

DNA is a long, double helix consisting of repeating units of deoxyribonucleotides.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 10

Enzymes having slightly different molecular structure but performing identical activity are

[1991]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 10

There are certain enzymes which have slightly different molecular structure but have similar catalytic function such enzymes are known as isoenzymes. Holoenzymes is the active compound formed by combination of a coenzyme and an apoenzyme. Apoenzyme is the protein component of an enzyme, to which the coenzyme attaches to form an active enzyme. Coenzyme are organic non-protein molecules  that bind with the protein molecule (apoenzyme) to form the active enzyme (holoenzyme).

Test: Biomolecules 4 - From Past 28 Years Questions - Question 11

Adenine is

[1992]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 11

The nitrogenous bases are constituents of DNA. The nitrogenous bases may be pruines or pyrimidines. Purines are 9 membered, double winged structures eg. adenine or guanine.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 12

Living cell contains 60 – 75% water. Water present in human body is

[1992]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 12

Water is the most abundant compound in the most majority of cells. About 65-70% of human body is water. Major portion of water found in human body occurs in the cells as intracellular water.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 13

Amino acids are produced from

[1992]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 13

An amino acid molecule consists of a central a carbon bonded to an amino group (–NH2), a carboxylic group (–COOH), a hydrogen atom and a carbon chain or ring on its sides.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 14

Which is distributed more widely in a cell ?

[1992]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 14

Bulk of RNA occurs in the cytoplasm and a small amount in the nucleus in eukaryotic cells. In prokaryotic cell RNA is found in the cytoplasm.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 15

Which is wrong about nucleic acids ?

[1993]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 15

Length of one helix is 34Å in B-DNA.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 16

An enzyme brings about

[1993]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 16

Enzymes accelerate chemical reaction by lowering the activation energy.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 17

The four elements making 99% of living system are

[1994]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 17

Principal or major elements include oxygen, carbon, hydrogen and nitrogen. They are so named because they alone constitute 99% of living system.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 18

Which one contains four pyrimidine bases ?

[1994]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 18

The pyrimidine bases include cytosine, thymine and uracil.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 19

Two free ribonucleotide units are interlinked with

[1995]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 19

In a phosphodiester bond, linkage takes place between the phosphate group of one nucleotide and the hydroxyl group of sugar (ribose or deoxyribose) of the adjacent nucleotide.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 20

A polysaccharide, which is synthesized and stored in liver cells, is

[1995]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 20

Glycogen is a polysaccharide, which is synthesized and stored in the liver. It is released into the blood by breakdown of simple glucose, and energy is released.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 21

the pyrenoids are made up of

[1995]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 21

The pyrenoids are small spherical protein bodies, surrounded by starch deposition found singly or in numbers embedded in the chloroplast of many algae and bryophytes.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 22

The nitrogenous organic base purine occuring in RNA is

[1996]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 22

The nitrogenous bases forming the nucleoside in RNA are adenine, guanine  (purines) and cytosine and uracil (pyrimidines).

Test: Biomolecules 4 - From Past 28 Years Questions - Question 23

In which one of the following groups, all the three are examples of polysaccharides?

[1996]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 23

Polysaccharides are complex carbohydrates formed by polymerization of a large number of units called monosaccharides, starch is a glucosan polysaccharide and is the major reserve food  of animals. Cellulose is the structural polysaccharide of  plant cell wall. Sucrose is a disaccharide formed of one unit of D-glucose and one unit of D-fructose. Maltose is a disaccharide formed of two molecules of glucose held together, lactose is disaccharide formed through condensation of  D-glucose and  D-glucose. Glucose and  fructose are monosaccharides.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 24

Most diverse macromolecules, found in the cell both physically and chemically are 

[1996]

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 24

Proteins are polymers of amino acids. There are only 20 amino acids which can be arranged in different orders in a polypeptide chain to form a wide array of proteins.

Test: Biomolecules 4 - From Past 28 Years Questions - Question 25

Genes are packaged into a bacterial chromosome by

[1997] 

Detailed Solution for Test: Biomolecules 4 - From Past 28 Years Questions - Question 25

Bacteria are prokaryotic organisms. Polyamines (basic proteins) like spermidine and cadaverine (instead of histones) are associated with DNA packaging in bacteria.

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