Biomolecules Chapter-Wise Test 9

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about phospholipids is incorrect?

Phospholipids are major components of cell membranes.
Phospholipids have hydrophobic tails and hydrophilic heads.
Phospholipids store genetic information.
Phospholipids form bilayers in aqueous solutions.
3

Phospholipids form structural components of cell membranes but do not store genetic information.

Which of the following is the most abundant protein in the animal world?

Keratin
Hemoglobin
Collagen
Actin
3

Collagen is the most abundant structural protein found in the animal kingdom.

Which of the following statements about DNA is incorrect?

DNA contains adenine, thymine, cytosine, and guanine.
DNA has a double-helix structure.
DNA is composed of glucose monomers.
DNA is responsible for genetic information storage.
3

DNA is composed of nucleotides, not glucose monomers.

Which of the following is a high-energy molecule involved in cellular metabolism?

AMP
ADP
ATP
NADP
3

ATP (adenosine triphosphate) is the primary energy carrier in cells, used in metabolic processes.

Which macromolecule forms the primary structure of enzymes?

Carbohydrates
Lipids
Proteins
Nucleic acids
3

Enzymes are primarily composed of proteins, which act as biological catalysts.

Which of the following statements about lipids is correct?

Lipids are insoluble in water.
Lipids are composed of amino acids.
Lipids serve as the genetic material of cells.
Lipids contain peptide bonds.
1

Lipids are hydrophobic and do not dissolve in water. They do not contain amino acids or peptide bonds.

Which of the following is a reducing sugar?

Sucrose
Lactose
Starch
Cellulose
2

Lactose is a reducing sugar because it has a free aldehyde or ketone group.

Which of the following statements about enzyme inhibition is correct?

Competitive inhibitors bind to the enzyme's active site.
Non-competitive inhibitors bind to the active site of the enzyme.
All inhibitors permanently deactivate enzymes.
Enzyme inhibition cannot be reversed.
1

Competitive inhibitors compete with the substrate by binding to the enzyme's active site. Non-competitive inhibitors bind elsewhere, and some inhibitors are reversible.

Which of the following statements about phospholipids is incorrect?

Phospholipids are major components of cell membranes.
Phospholipids have hydrophobic tails and hydrophilic heads.
Phospholipids store genetic information.
Phospholipids form bilayers in aqueous solutions.
3

Phospholipids are structural components of membranes but do not store genetic information.

Which of the following statements about amino acids is correct?

Amino acids are linked by glycosidic bonds.
Amino acids contain an amino group and a carboxyl group.
Amino acids do not contain nitrogen.
All amino acids are synthesized by the human body.
2

Amino acids contain an amino (-NH₂) group and a carboxyl (-COOH) group. They are linked by peptide bonds, not glycosidic bonds.

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