Biomolecules Chapter-Wise Test 5

Correct answer Carries: 4.

Wrong Answer Carries: -1.

The linkage between amino acids in proteins is called?

Amino acids in proteins are linked by peptide bonds formed between the carboxyl group of one amino acid and the amino group of another.

Glycosidic linkage
Hydrogen bond
Disulfide linkage
Peptide bond
4

Which nucleic acid base is a purine with a double-ring structure?

Adenine is a purine base with a double-ring structure (fused pyrimidine and imidazole rings), found in both DNA and RNA.

Cytosine
Thymine
Uracil
Adenine
4

What functional group is present in the open chain form of fructose?

Fructose, a ketohexose, has a ketone group (-C=O) at C2 in its open chain form.

Aldehyde
Ketone
Carboxyl
Hydroxyl
2

Which amino acid has an aromatic side chain?

Phenylalanine contains an aromatic benzene ring in its side chain, distinguishing it from others.

Glycine
Alanine
Phenylalanine
Proline
3

Which biomolecule stores genetic information?

DNA (deoxyribonucleic acid) is the primary biomolecule responsible for storing genetic information in cells.

DNA
RNA
Protein
Carbohydrate
1

Which vitamin is produced by gut bacteria?

Vitamin K is synthesized by gut bacteria and absorbed in the intestines, aiding in blood clotting.

Vitamin A
Vitamin C
Vitamin D
Vitamin K
4

Which amino acid has a side chain with a positive charge at physiological pH?

Arginine has a guanidinium group in its side chain, which is positively charged at pH ~7 due to protonation.

Aspartic acid
Arginine
Glutamic acid
Serine
2

What is the sugar moiety in RNA?

RNA contains ribose, a five-carbon sugar, unlike DNA which has 2-deoxyribose.

Deoxyribose
Glucose
Fructose
Ribose
4

Which of the following is an aldopentose?

An aldopentose is a five-carbon monosaccharide with an aldehyde group. Ribose fits this description.

Ribose
Fructose
Glucose
Galactose
1

Which vitamin deficiency causes pellagra?

Vitamin B₃ (Niacin) deficiency leads to pellagra, characterized by dermatitis, diarrhea, and dementia.

Vitamin B₁
Vitamin B₂
Vitamin B₃
Vitamin B₆
3

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