Biomolecules (Biology)

Transition state structure of the substrate formed during an enzymatic reaction is

1. transient and unstable
2. permanent and stable
3. transient but stable
4. permanent but unstable.

The essential chemical components of many coenzymes are

1. carbohydrates
2. vitamins
3. proteins
4. nucleic acids.

Which of the following statements about enzymes is wrong?

1. Enzymes are denaturated at high temperatures.
2. Enzymes are mostly proteins but some are lipids also.
3. Enzymes are highly specific.
4. Enzymes require optimum pH and temperature for maximum activity.

Uridine, present only in RNA is a

1. nucleoside
2. nucleotide
3. purine
4. pyrimidine.

The figure shows a hypothetical tetrapeptide portion of a protein with parts labelled A - D. Which one of the following options is correct? [figure]

1. D is an acidic amino acid-glutamic acid.
2. C is an aromatic amino acid-tryptophan.
3. A is the C-terminal amino acid and D is N-terminal amino acid.
4. A is a sulphur containing amino acid methionine.

Which one of the following biomolecules is correctly characterized?

1. Lecithin – a phosphorylated glyceride found in cell membrane.
2. Palmitic acid – an unsaturated fatty acid with 18 carbon atoms.
3. Adenylic acid – adenosine with a glucose phosphate molecule.
4. Alanine amino acid – contains an amino group and an acidic group anywhere in the molecule.

For its activity, carboxypeptidase requires

1. Zinc
2. iron
3. niacin
4. copper

Which one out of A - D given below correctly represents the structural formula of the basic amino acid? [figure]

1. C
2. D
3. A
4. B

Which one is the most abundant protein in the animal world?

1. Trypsin
2. Haemoglobin
3. Collagen
4. Insulin

The given diagrammatic representation shows one of the categories of small molecular weight organic compounds in the living tissues. Identify the category shown and the one blank component “X” in it. [figure]

1. [figure]
2. [figure]
3. [figure]
4. [figure]