Biomolecules (Biology)

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:

1. Statement I is incorrect but Statement II is correct
2. Both Statement I and Statement II are correct
3. Both Statement I and Statement II are incorrect
4. Statement I is correct but Statement II is incorrect

In the enzyme which catalyses the breakdown of: 2H2O2 2H2O + O2 the prosthetic group is :

1. Niacin
2. Nicotinamide adenine dinucleotide
3. Haem
4. Zinc

Which of the following are not secondary metabolites in plants?

1. Rubber, gums
2. Morphine, codeine
3. Amino acids, glucose
4. Vinblastin, curcumin

Match List-I with List-II. Choose the correct answer from the options given below.

1. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
2. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
3. (a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
4. (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

Identify the incorrect pair

1. Drugs - Ricin
2. Alkaloids - Codeine
3. Toxin - Abrin
4. Lectins - Concanavalin A

Following are the statements with reference to 'lipids'. Choose the correct answer from the options given below.

1. B and E only
2. A and B only
3. C and D only
4. B and C only

Identify the substances having glycosidic bond and peptide bond, respectively in their structure

1. Glycerol, trypsin
2. Cellulose, lecithin
3. Inulin, insulin
4. Chitin, cholesterol

Which one of the following is the most abundant protein in the animals?

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

Match the following Choose the correct option from the following

1. (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
2. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
3. (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
4. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

Identify the basic amino acid from the following

1. Valine
2. Lysine
3. Tyrosine
4. Glutamic Acid

Concanavalin A is:

1. a lectin
2. a pigment
3. an alkaloid
4. an essential oil

Consider the following statements: Select the correct option

1. Both A and B are false
2. A is false but B is true
3. Both A and B are true
4. A is true but B is false

The two functional groups characteristic of sugars are

1. carbonyl and methyl
2. carbonyl and hydroxyl
3. hydroxyl and methyl
4. carbonyl and phosphate

Which of the following statements is correct with reference to enzymes?

1. Holoenzyme = Apoenzyme + Coenzyme
2. Coenzyme = Apoenzyme + Holoenzyme
3. Holoenzyme = Coenzyme + Co-factor
4. Apoenzyme = Holoenzyme + Coenzyme

Which of the following are not polymeric?

1. Proteins
2. Polysaccharides
3. Lipids
4. Nucleic acids

A typical fat molecule is made up of

1. one glycerol and one fatty acid molecule
2. three glycerol and three fatty acid molecules
3. three glycerol molecules and one fatty acid molecule
4. one glycerol and three fatty acid molecules.

Which one of the following statements is wrong?

1. Uracil is a pyrimidine.
2. Glycine is a sulphur containing amino acid.
3. Sucrose is a disaccharide.
4. Cellulose is a polysaccharide.

A non-proteinaceous enzyme is

1. lysozyme
2. ribozyme
3. ligase
4. deoxyribonuclease.

Which of the following is the least likely to be involved in establishing the three-dimensional folding of most proteins?

1. Hydrogen bonds
2. Electrostatic interaction
3. Hydrophobic interaction
4. Ester bonds

Which of the following describes the given graph correctly? [figure]

1. Endothermic reaction with energy A in presence of enzyme and B in absence of enzyme.
2. Exothermic reaction with energy A in presence of enzyme and B in absence of enzyme.
3. Endothermic reaction with energy A in absence of enzyme and B in presence of enzyme.
4. Exothermic reaction with energy A in absence of enzyme and B in presence of enzyme.

The chitinous exoskeleton of arthropods is formed by the polymerisation of

1. N-acetyl glucosamine
2. lipoglycans
3. keratin sulphate and chondroitin sulphate
4. D-glucosamine.

Which of the following biomolecules does have a phosphodiester bond?

1. Amino acids in a polypeptide
2. Nucleotides in a nucleic acid
3. Fatty acids in a diglyceride
4. Monosaccharides in a polysaccharide

Which one of the following statements is incorrect?

1. The competitive inhibitor does not affect the rate of breakdown of the enzyme-substrate complex.
2. The presence of the competitive inhibitor decreases the Km of the enzyme for the substrate.
3. A competitive inhibitor reacts reversibly with the enzyme to form an enzyme-inhibitor complex.
4. In competitive inhibition, the inhibitor molecule is not chemically changed by the enzyme.

Select the option which is not correct with respect to enzyme action.

1. Substrate binds with enzyme at its active site.
2. Addition of a lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate.
3. A non-competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate.
4. Malonate is a competitive inhibitor of succinic dehydrogenase.

Which one of the following is a non-reducing carbohydrate?

1. Maltose
2. Sucrose
3. Lactose
4. Ribose 5-phosphate

A phosphoglyceride is always made up of

1. a saturated or unsaturated fatty acid esterified to glycerol molecule to which a phosphate group is also attached.
2. a saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol molecule.
3. only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.
4. only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.

Macromolecule chitin is

1. sulphur containing polysaccharide
2. simple polysaccharide
3. nitrogen containing polysaccharide
4. phosphorus containing polysaccharide.

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.