Biomolecules (Biology)

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.

The figure given below shows the conversion of a substrate into product by an enzyme. In which one of the four options (1 – 4) the components of reaction labelled as A, B, C and D are identified correctly? [figure]

1. array|l|l|l|l| A & B & C & D \ Potential energy & Transition state & Activation energy & Activation energy without enzyme \ array
2. array|l|l|l|l| A & B & C & D \ Transition state & Potential energy & Activation energy without enzyme & Activation energy with enzyme \ array
3. array|l|l|l|l| A & B & C & D \ Potential energy & Transition state & Activation energy with enzyme & Activation energy without enzyme \ array
4. array|l|l|l|l| A & B & C & D \ Activation energy with enzyme & Transition state & Activation energy without enzyme & Potential energy \ array

Carbohydrates are commonly found as starch in plant storage organs. Which of the following five properties of starch (A – E) make it useful as a storage material? The useful properties are

1. (A), (C) and (E)
2. (A) and (E)
3. (B) and (C)
4. (B) and (D)