NEET Biology Biomolecules MCQs Set 22

Answer: (b) A heteropolymer

Explanation:
1. Peptidoglycan is a heteropolysaccharide made up of two alternate amino sugar molecules i.e., N-acetyl glucosamines and N-acetyl muramic acid.

Answer: (b) Collagen

Explanation:
1. This is so because chitin, peptidoglycan and hyaluronic acid, are polysaccharide, not protein.

Answer: (c) Peptide bond

Explanation:
1. Glycosidic bond : Formed between the two monosaccharides (sugar molecule).
2. Phosphodiester bond : This bond is formed in nucleic acid i.e.
3. DNA or RNA, between the phosphate and hydroxyl group of sugar.

Answer: (b) Haemoglobin

Explanation:
1. Myoglobin : Tertiary structure Keratin : Secondary structure.

Answer: (b) Phospholipid

Explanation:
1. This is so because lecithin made up of a molecule of glycerol, a phosphate group, 2 fatty acid molecules, choline (N-containing alcohol molecule) O O CH₂ O C R1 R2 C O CH O CH3 CH₂ O P O CH₂ CH₂ N CH3 OH CH3 Lecithin.

Answer: (a) Acetic acid

Explanation:
1. In biosynthetic pathway or anabolic pathway, the acetic acid is converted into cholesterol in liver.

Answer: (c) Ribose

Explanation:
1. Ribose is a monosaccharide sugar present in RNA. Deoxyribose is a derived monosaccharide sugar present in DNA.

Answer: (a) Sugar + Nitrogenous base

Explanation:
1. Nucleoside = Sugar + Nitrogenous base Nucleotide = Sugar + Nitrogenous base + Phosphate.

Answer: (c) 10 base pairs

Explanation:
1. A form → 11 base pairs B form → 10 base pairs C form → 9 base pairs D form → 8 base pairs.

Answer: (b) Thymine

Explanation:
1. In DNA, A T, C G.

Answer: (c) 3.4 Å

Explanation:
1. In B-DNA, the rise per base pair would be 3.4 Å.

Answer: (b) Hydrogen bond

Explanation:
1. Hydrogen bond : The bond formed between two polynucleotide strands of DNA. Glycosidic bond : Formed between the two monosaccharides (sugar).
2. Peptide bond : Formed between 2 amino acids.
3. Phosphodiester bond : Bond formed in nucleic acid i.e.
4. DNA or DNA, between the phosphate and hydroxyl group of sugar.

Answer: (b) Watson and Crick

Explanation:
1. The double helix model of DNA was proposed by Watson and Crick.

Answer: (c) The fifth carbon of pentose sugar is free

Explanation:
1. One end of the strand is called 5′ end where the fifth carbon of the pentose sugar is free and the other is called 3'end where the third carbon of pentose sugar is free.

Answer: (c) 34 Å

Explanation:
1. In B-DNA, one turn of helical strand has 10 nucleotides.
2. The base pairs of DNA are stacked 3.4 Å part. ∴ Pitch of the DNA = 3.4 Å × 10 = 34 Å.

Answer: (d) A hydrogen

Explanation:
1. Glycine is a simplest amino acid in which R-group is replaced by hydrogen.

Answer: (d) All of these

Explanation:
1. This is so because amino acid can carry both +ve and –ve charges simultaneously, hence they are termed as Zwitterions.

Answer: (d) Both (2) & (3)

Explanation:
1. This is so because non-essential amino acid are synthesised in our body, so there is no need to take it in our diet.

Answer: (a) Enzymes

Explanation:
1. Metabolic flux is the rate of turn over of molecules through a metabolic pathway.

Answer: (b) Ribonucleic acids

Explanation:
1. This is so because ribozymes are the RNA which act as an enzyme.

Answer: (c) It gets converted into lactic acid

Explanation:
1. Under anaerobic condition, the glucose is converted into lactic acid in muscle.

Answer: (a) Prosthetic group

Explanation:
1. Enzyme (Holoenzyme) Protein part Non-protein part (Apozyme) (Cofactor) Organic compound Inorganic It includes metal ions 2+ 2+ Tightly bound Loosely bound i.e., Zn , Mg , etc. (Prosthetic group).

Answer: (c) Sulphanilamide

Explanation:
1. Sulpha drugs are derivatives of sulphanilamide, which inhibit the synthesis of folic acid in bacteria by competing with p-amino benzoic acid (PABA) required for the synthesis of folic acid by folic acid synthetase.