BITSAT Chemistry Biomolecules MCQs

Question: Which has glycosidic linkage?

a) Amylopectin

b) Amylase

c) Cellulose

d) All of these

Answer: All of these

Question: Which one of the following is an amine hormone ?

a) Thyroxine

b) Oxypurin

c) Insulin

d) Progesterone

Answer: Thyroxine

Question: Fructose on reduction gives a mixture of two alcohols which are related as

a) Diastereomers

b) Epimers

c) Both (a) and (b)

d) Anomers

Answer: Both (a) and (b)

Question: What will happen when D-(+)-glucose is treated with methanolic —HCl followed by Tollens’ reagent ?

a) A black ppt. will be formed

b) A red ppt. will be formed

c) A green colour will appear

d) No characteristic colour or ppt. will be formed

Answer: No characteristic colour or ppt. will be formed

Question: The metal present in vitamin B₁₂ is

a) Magnesium

b) Cobalt

c) Copper

d) Zinc

Answer: Cobalt

Question: A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid?

a) Three

b) Four

c) One

d) Two

Answer: Three

Question: Which functional group participates in disulphide bond formation in proteins?

a) Thioester

b) Thioether

c) Thiol

d) Thiolactone

Answer: Thiol

Question: Insulin production and its action in human body are responsible for the level of diabetes. This compound belongs to which of the following categories ?

a) An enzyme

b) A hormone

c) A co-enzyme

d) An antibiotic

Answer: A hormone

Question: Which statement is incorrect about peptide bond?

a) C–N bond length in proteins is longer than usual C–N bond length

b)

spectroscopic analysis shows planar structure of bond

c) C–N bond length in proteins is smaller than usual C–N bond length

d) None of these

Answer: C–N bond length in proteins is longer than usual C–N bond length

Question: The helical structure of protein is stabilised by

a) Peptide bonds

b) Dipeptide bonds

c) Hydrogen bonds

d) Vander waals forces

Answer: Hydrogen bonds

Question: Complete hydrolysis of cellulose gives

a) D-ribose

b) D-glucose

c) L-glucose

d) D-fructose

Answer: D-glucose

Question: The structural feature which distinguishes proline from natural a-amino acids?

a) Proline is optically inactive

b) Proline contains aromatic group

c) Proline is a dicarboxylic acid

d) Proline is a secondary amine

Answer: Proline is a secondary amine

Question: The secondary structure of a protein refers to

a) fixed configuration of the polypeptide backbone

b) α – helical backbone

c) hydrophobic interactions

d) sequence of α – amino acids

Answer: α – helical backbone

Question: Which of the following statements about vitamin B-12 is incorrect?

a) It has a cobalt atom

b) It also occurs in plants

c) It is also present in rain water

d) It is needed for human body in very small amounts

Answer: It also occurs in plants

Question: The hormone which controls the processes of burning of fats, proteins and carbohydrates to liberate energy in the body is

a) Cortisone

b) Adrenaline

c) Thyroxine

d) Insulin

Answer: Insulin

Question: The water soluble vitamin is

a) B₁

b) K

c) E

d) D

Answer: B₁

Question: Scurvy is caused by the deficiency of vitamin

a) D

b) C

c) B₆

d) A

Answer: C

Question: Which of the following hormones contain iodine?

a) Thyroxine

b) Progesterone

c) Adrenaline

d) Estron

Answer: Thyroxine

Question: Deficiency of vitamin E causes

a) Loss of fertility

b) Impaired clotting

c) Scurvy

d) Night blindness

Answer: Loss of fertility

Question: A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid?

a) Three

b) Four

c) One

d) Two

Answer: Three