Biomolecules (Biology)

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]

The curve given below shows enzymatic activity in relation to three conditions (pH, temperature and substrate concentration). What do the two axes (x and y) represent? [figure]

1. array|l|l| x-axis & y-axis \ enzymatic activity & pH \ array
2. array|l|l| x-axis & y-axis \ temperature & enzyme activity \ array
3. array|l|l| x-axis & y-axis \ substrate concentration & enzymatic activity \ array
4. array|l|l| x-axis & y-axis \ enzymatic activity & temperature \ array

Which one of the following structural formulae of two organic compounds is correctly identified along with its related function? [figure]

1. B : Adenine – A nucleotide that makes up nucleic acids
2. A : Triglyceride – Major source of energy
3. B : Uracil – A component of DNA
4. A : Lecithin – A component of cell membrane

Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?

1. Enzymes require optimum pH for maximal activity.
2. Enzymes are denatured at high temperature but in certain exceptional organisms they are effective even at temperatures 80 –90 .
3. Enzymes are highly specific.
4. Most enzymes are proteins but some are lipids.