Biomolecules Chapter-Wise Test 6

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is an example of a cofactor required for enzyme activity?

Zn²⁺
Mg²⁺
Both A and B
None of the above
3

Both Zn²⁺ and Mg²⁺ act as cofactors for various enzymes, helping in their catalytic activity.

Which of the following is a coenzyme?

Zn²⁺
NAD
Haem
Mg²⁺
2

NAD (Nicotinamide Adenine Dinucleotide) is a coenzyme that plays a key role in redox reactions.

Which of the following statements about nucleotides is incorrect?

Nucleotides contain a phosphate group.
Adenosine triphosphate (ATP) is a nucleotide.
Nucleotides do not contain any sugar molecules.
DNA nucleotides contain nitrogenous bases.
3

Nucleotides contain a pentose sugar, a nitrogenous base, and a phosphate group.

Which of the following nitrogenous bases is a purine?

Adenine
Thymine
Cytosine
Uracil
1

Adenine is a purine, characterized by a two-ring structure, while thymine, cytosine, and uracil are pyrimidines.

Which enzyme catalyzes the conversion of substrate into product by binding to its active site?

Ligase
Transferase
Enzyme-substrate complex
Isomerase
3

The enzyme-substrate complex forms when an enzyme binds to its substrate, facilitating the reaction.

What type of macromolecule is glycogen?

Protein
Polysaccharide
Nucleic acid
Lipid
2

Glycogen is a polysaccharide that serves as a storage form of glucose in animals.

Which of the following statements about amino acids is correct?

Amino acids are the monomers of proteins.
Amino acids do not contain nitrogen.
Amino acids do not have a carboxyl (-COOH) group.
Amino acids are linked by glycosidic bonds.
1

Amino acids are the building blocks of proteins. They contain nitrogen, a carboxyl group, and are linked by peptide bonds, not glycosidic bonds.

Which protein is most abundant in the human body?

Actin
Collagen
Hemoglobin
Keratin
2

Collagen is the most abundant protein in the human body, providing structural support to connective tissues.

Which of the following statements about enzymes is true?

They are consumed in reactions
They work best at any temperature
They lower the activation energy of reactions
They can function even after being denatured
3

Enzymes function by lowering the activation energy required for a chemical reaction to occur.

Which of the following statements about lipids is true?

They are polymers of fatty acids
They are soluble in water
They are important components of cell membranes
They contain peptide bonds
3

Lipids are essential components of cell membranes, forming the phospholipid bilayer.

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