Biomolecules Chapter-Wise Test 10

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which amino acid contributes to the yellow color of some proteins?

Tyrosine, with its aromatic phenol side chain, can contribute to protein coloration due to its light-absorbing properties.

Glycine
Tyrosine
Cysteine
Lysine
2

Which nucleic acid forms a cloverleaf structure?

Transfer RNA (tRNA) has a cloverleaf secondary structure due to intramolecular hydrogen bonding.

mRNA
rRNA
DNA
tRNA
4

Which nucleic acid base is a pyrimidine with a methyl group?

Thymine, a pyrimidine base in DNA, has a methyl group (-CH₃) attached to its ring structure.

Thymine
Uracil
Cytosine
Adenine
1

What type of structure is disrupted during protein denaturation?

Denaturation disrupts the secondary and tertiary structures of proteins due to the breaking of hydrogen bonds and other interactions, while the primary structure remains intact.

Primary
Quaternary
Tertiary
Peptide linkage
3

How many hydrogen bonds are formed between adenine and thymine in DNA?

Adenine and thymine form two hydrogen bonds in DNA, contributing to base pairing stability.

3
1
4
2
4

Which enzyme hydrolyzes sucrose into glucose and fructose?

Invertase (also called sucrase) catalyzes the hydrolysis of sucrose into glucose and fructose.

Lactase
Invertase
Maltase
Amylase
2

Which monosaccharide is found in RNA?

Ribose, a five-carbon sugar, is the monosaccharide component of RNA nucleotides.

Ribose
Deoxyribose
Glucose
Fructose
1

Which vitamin enhances the absorption of iron in the intestine?

Vitamin C (ascorbic acid) reduces Fe³⁺ to Fe²⁺, improving iron absorption in the gut.

Vitamin C
Vitamin D
Vitamin B₆
Vitamin E
1

Which monosaccharide forms a pentaacetate when reacted with acetic anhydride?

Glucose, with five -OH groups in its open chain form, reacts with acetic anhydride to form a pentaacetate, confirming its structure.

Glucose
Fructose
Ribose
Sucrose
1

Which of the following is a reducing disaccharide?

Maltose is a reducing disaccharide because it has a free anomeric carbon on one glucose unit.

Sucrose
Lactose
Fructose
Maltose
4

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