Biomolecules Chapter-Wise Test 2

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which vitamin is a precursor to NAD+?

Vitamin B₃ (Niacin) is converted into nicotinamide, a component of NAD+, a coenzyme in redox reactions.

Vitamin B₁
Vitamin B₂
Vitamin B₅
Vitamin B₃
4

Which amino acid contains an imidazole ring in its side chain?

Histidine has an imidazole ring in its side chain, which can act as a proton donor or acceptor.

Tyrosine
Phenylalanine
Histidine
Tryptophan
3

Which protein structure is a sequence of amino acids?

The primary structure of a protein is the linear sequence of amino acids linked by peptide bonds.

Secondary
Tertiary
Quaternary
Primary
4

Which vitamin aids in the synthesis of FAD?

Vitamin B₂ (Riboflavin) is a precursor to flavin adenine dinucleotide (FAD), a coenzyme in redox reactions.

Vitamin B₁
Vitamin B₂
Vitamin B₅
Vitamin B₆
2

Which amino acid has an acidic side chain?

Aspartic acid has an acidic side chain (-CH₂-COOH), capable of donating protons.

Lysine
Serine
Aspartic acid
Glycine
3

The primary structure of a protein is held together by which type of bond?

The primary structure of a protein is the sequence of amino acids linked by peptide bonds between carboxyl and amino groups.

Peptide bond
Hydrogen bond
Disulfide bond
Ionic bond
1

Which vitamin is a coenzyme in transamination reactions?

Vitamin B₆ (Pyridoxine), as pyridoxal phosphate (PLP), is a coenzyme in transamination, aiding amino acid metabolism.

Vitamin B₁
Vitamin B₆
Vitamin B₃
Vitamin B₁₂
3

Which base pairs with adenine in RNA?

In RNA, adenine pairs with uracil via two hydrogen bonds, unlike DNA where it pairs with thymine.

Thymine
Guanine
Cytosine
Uracil
4

Which monosaccharide gives a positive Fehling’s test?

Galactose, an aldohexose with a free aldehyde group, reduces Cu²⁺ in Fehling’s solution, producing a red precipitate.

Galactose
Sucrose
Deoxyribose
Fructose-6-phosphate
1

What is the functional group at C1 of glucose in its open chain form?

Glucose, an aldohexose, has an aldehyde group (-CHO) at C1 in its open chain form.

Ketone
Aldehyde
Carboxyl
Hydroxyl
2

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