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  4. Biomolecules Chapter-Wise Test 3

Biomolecules Chapter-Wise Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What is the molecular formula of sucrose?

Sucrose, a disaccharide, has the molecular formula \( \ce{C12H22O11} \), formed by glucose and fructose.

\( \ce{C6H12O6} \)
\( \ce{C12H24O12} \)
\( \ce{C12H22O11} \)
\( \ce{C10H20O10} \)
3

Which base pairs with guanine in DNA?

In DNA, guanine pairs with cytosine via three hydrogen bonds, following base-pairing rules.

Adenine
Thymine
Uracil
Cytosine
4

Which type of bond can form between cysteine residues in a protein?

Cysteine residues can form disulfide bonds (-S-S-) via oxidation of their sulfhydryl (-SH) groups, stabilizing protein structure.

Hydrogen bond
Disulfide bond
Peptide bond
Ionic bond
2

Which protein structure is unaffected by denaturation?

The primary structure (amino acid sequence linked by peptide bonds) remains intact during denaturation, unlike higher-order structures.

Secondary
Tertiary
Quaternary
Primary
4

Which type of sugar is glucose?

Glucose is an aldose sugar due to the presence of an aldehyde group at C1 in its open chain form.

Aldose
Ketose
Pentose
Disaccharide
1

What is the product formed when glucose is oxidized with bromine water?

Bromine water, a mild oxidizing agent, oxidizes the aldehyde group of glucose to a carboxylic acid, forming gluconic acid.

Gluconic acid
Saccharic acid
n-Hexane
Fructose
1

Which type of bond stabilizes the tertiary structure of proteins?

Disulfide bonds, formed between cysteine residues, help stabilize the tertiary structure of proteins.

Peptide bond
Disulfide bond
Glycosidic bond
Phosphodiester bond
2

What is the glycosidic linkage in sucrose?

Sucrose has an α-1,2-glycosidic linkage between C1 of glucose and C2 of fructose, making it non-reducing.

β-1,4
α-1,4
α-1,2
β-1,6
3

Which protein is a component of hair and nails?

Keratin, a fibrous protein, provides structural support in hair, nails, and skin.

Hemoglobin
Insulin
Collagen
Keratin
4

Which monosaccharide is an isomer of glucose?

Fructose is an isomer of glucose, both having the molecular formula \( \ce{C6H12O6} \), but differing in functional groups (aldose vs. ketose).

Ribose
Fructose
Deoxyribose
Galactose
2

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