Biomolecules Chapter-Wise Test 9

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which protein is involved in oxygen transport?

Hemoglobin, a globular protein, transports oxygen in the blood by binding it to its heme groups.

Collagen
Keratin
Insulin
Hemoglobin
4

Which nucleic acid base forms a triple hydrogen bond with its complement?

Guanine pairs with cytosine in DNA via three hydrogen bonds, enhancing stability.

Guanine
Adenine
Thymine
Uracil
1

Which monosaccharide is a hexose with a ketone group?

Fructose is a ketohexose, a six-carbon sugar with a ketone group at C2.

Glucose
Galactose
Fructose
Ribose
3

Which amino acid has a side chain that can act as a buffer in physiological pH?

Histidine’s imidazole side chain has a pKa near physiological pH (~6.0), allowing it to act as a buffer.

Lysine
Serine
Methionine
Histidine
4

Which vitamin deficiency causes inflammation of the tongue?

Vitamin B₂ (Riboflavin) deficiency leads to glossitis (tongue inflammation) and other symptoms like cheilosis.

Vitamin B₂
Vitamin B₆
Vitamin C
Vitamin D
1

Which vitamin is a component of coenzyme A?

Vitamin B₅ (Pantothenic acid) is a key component of coenzyme A, involved in acyl group transfer reactions.

Vitamin B₅
Vitamin B₁
Vitamin B₆
Vitamin C
1

How many oxygen atoms are present in a sucrose molecule?

Sucrose (\( \ce{C12H22O11} \)) has 11 oxygen atoms, as indicated by its molecular formula.

10
12
11
6
3

Which monosaccharide is a reducing sugar?

Glucose is a reducing sugar because it has a free aldehyde group in its open chain form that can reduce oxidizing agents like Tollens’ or Fehling’s reagents.

Glucose
Sucrose
Fructose-1-phosphate
Galactose-6-phosphate
1

Which hormone is responsible for regulating blood glucose levels by decreasing it?

Insulin lowers blood glucose levels by facilitating glucose uptake into cells.

Glucagon
Epinephrine
Insulin
Thyroxine
3

Which protein facilitates muscle contraction?

Myosin, a fibrous protein, interacts with actin to enable muscle contraction in muscle fibers.

Myosin
Hemoglobin
Collagen
Insulin
1

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