Biomolecules Chapter-Wise Test 17

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which protein structure is disrupted by heat without breaking peptide bonds?

The tertiary structure, stabilized by weak interactions (e.g., hydrogen bonds, hydrophobic interactions), is disrupted by heat during denaturation.

Primary
Secondary
Quaternary
Tertiary
4

What is the product when glucose is reduced with hydrogen?

Reduction of glucose (an aldohexose) with hydrogen converts the aldehyde group to an alcohol, forming sorbitol.

Mannitol
Sorbitol
Fructose
Galactose
2

What type of bond links the monosaccharide units in sucrose?

Sucrose has a glycosidic bond between the anomeric carbon of glucose (C1) and fructose (C2), making it a non-reducing sugar.

Glycosidic bond
Peptide bond
Ester bond
Hydrogen bond
1

Which monosaccharide is a component of lactose?

Lactose is composed of galactose and glucose, linked by a β-1,4-glycosidic bond.

Fructose
Ribose
Galactose
Mannose
3

Which disaccharide is a reducing sugar?

Lactose is a reducing sugar because it has a free anomeric carbon on the glucose unit.

Sucrose
Maltose
Lactose
Fructose
3

Which amino acid is involved in forming disulfide bridges?

Cysteine forms disulfide bridges (-S-S-) via oxidation of its sulfhydryl groups, stabilizing protein structure.

Methionine
Serine
Cysteine
Tyrosine
3

Which disaccharide does not react with Tollens’ reagent?

Sucrose is a non-reducing sugar because it lacks a free anomeric carbon, so it does not react with Tollens’ reagent.

Maltose
Sucrose
Lactose
Glucose
2

Which monosaccharide differs from glucose only at C2?

Mannose is an epimer of glucose, differing only in the configuration at C2.

Galactose
Fructose
Mannose
Ribose
3

Which protein is a hormone?

Insulin is a protein hormone that regulates blood glucose levels by facilitating glucose uptake.

Insulin
Hemoglobin
Collagen
Keratin
1

Which base pairs with adenine in DNA?

In DNA, adenine pairs with thymine via two hydrogen bonds, following base-pairing rules.

Guanine
Thymine
Cytosine
Uracil
2

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