Biomolecules Chapter-Wise Test 15

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which type of bond links the sugar and nitrogenous base in a nucleotide?

A glycosidic bond connects the sugar (ribose or deoxyribose) to the nitrogenous base in a nucleotide.

Phosphodiester bond
Glycosidic bond
Peptide bond
Hydrogen bond
2

Which nucleic acid contains a sugar with a missing hydroxyl group at C2?

DNA contains deoxyribose, which lacks an -OH group at C2, unlike ribose in RNA.

mRNA
tRNA
DNA
rRNA
3

Which sugar is present in milk?

Lactose, a disaccharide, is the primary sugar found in milk.

Sucrose
Maltose
Lactose
Glucose
3

Which vitamin supports the conversion of pyruvate to acetyl-CoA?

Vitamin B₁ (Thiamine), as part of TPP, aids in the decarboxylation of pyruvate to acetyl-CoA.

Vitamin B₂
Vitamin B₆
Vitamin B₅
Vitamin B₁
4

What type of bond stabilizes the secondary structure of proteins?

The secondary structure (e.g., alpha-helix, beta-sheet) of proteins is stabilized by hydrogen bonds between the backbone atoms.

Peptide bond
Hydrogen bond
Disulfide bond
Ionic bond
2

Which nucleic acid base pairs with two hydrogen bonds in DNA?

Adenine pairs with thymine in DNA via two hydrogen bonds, contributing to the double helix stability.

Adenine
Guanine
Cytosine
Uracil
1

What is the number of chiral carbons in the open chain form of glucose?

Glucose, an aldohexose, has four chiral carbons in its open chain form at C2, C3, C4, and C5.

2
3
5
4
4

Which vitamin deficiency leads to pernicious anemia?

Vitamin B₁₂ (cobalamin) deficiency causes pernicious anemia due to impaired red blood cell production.

Vitamin B₆
Vitamin B₁₂
Vitamin B₃
Vitamin C
2

Which monosaccharide has the same number of carbon atoms as glucose but a different functional group?

Fructose is a ketohexose with 6 carbons like glucose (an aldohexose), but it has a ketone group instead of an aldehyde.

Galactose
Ribose
Mannose
Fructose
4

Which monosaccharide reacts with Benedict’s solution to give a red precipitate?

Glucose, a reducing sugar with a free aldehyde group, reduces Cu²⁺ in Benedict’s solution to form a red Cu₂O precipitate.

Glucose
Sucrose
Fructose-1-phosphate
Deoxyribose
1

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