Biomolecules Chapter-Wise Test 12

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which nucleic acid base is exclusive to RNA?

Uracil is found only in RNA, replacing thymine, which is exclusive to DNA.

Thymine
Guanine
Uracil
Adenine
3

Which protein is denatured by changes in pH?

Globular proteins like hemoglobin are denatured by pH changes, disrupting ionic and hydrogen bonds in their structure.

Collagen
Hemoglobin
Keratin
Myosin
2

How many nitrogen atoms are present in the adenine base?

Adenine, a purine, has five nitrogen atoms in its double-ring structure (three in the pyrimidine ring, two in the imidazole ring).

3
4
5
6
3

Which amino acid has a hydroxyl group in its side chain?

Serine has a hydroxyl group (-OH) in its side chain (-CH₂OH), making it polar.

Glycine
Serine
Methionine
Valine
2

Which protein structure involves beta-pleated sheets?

The secondary structure of proteins includes beta-pleated sheets, stabilized by hydrogen bonds between backbone atoms.

Primary
Tertiary
Quaternary
Secondary
4

Which monosaccharide is an epimer of galactose at C4?

Glucose is an epimer of galactose, differing only at C4 in their open chain structures.

Fructose
Mannose
Glucose
Ribose
3

Which protein structure involves hydrophobic interactions?

The tertiary structure of proteins is stabilized by hydrophobic interactions, among other forces, folding nonpolar side chains inward.

Primary
Secondary
Quaternary
Tertiary
4

Which of the following is a pyrimidine base?

Pyrimidine bases in nucleic acids include cytosine, thymine, and uracil; cytosine is common to both DNA and RNA.

Adenine
Guanine
Cytosine
Purine
3

Which nucleic acid serves as a template for RNA synthesis?

DNA serves as the template for RNA synthesis during transcription.

RNA
Protein
Carbohydrate
DNA
4

Which amino acid contains a sulfur atom in its side chain?

Methionine has a sulfur atom in its side chain (-CH₂-CH₂-S-CH₃), distinguishing it from other amino acids.

Glycine
Serine
Methionine
Tyrosine
3

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