Biomolecules Chapter-Wise Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about nucleic acids is correct?

DNA contains ribose sugar instead of deoxyribose.
RNA is usually single-stranded.
DNA and RNA both contain uracil.
DNA is composed of amino acids.
2

RNA is usually single-stranded, while DNA contains deoxyribose and thymine instead of uracil.

Which of the following statements about enzymes is correct?

Enzymes are consumed during a chemical reaction.
Enzymes increase activation energy to speed up reactions.
Enzymes remain unchanged after the reaction.
Enzymes work at any temperature and pH.
3

Enzymes remain unchanged after catalyzing a reaction. They lower activation energy and function within specific temperature and pH ranges.

Which of the following statements about lipids is incorrect?

Lipids are insoluble in water.
Lipids play a role in cell membrane structure.
Lipids contain peptide bonds.
Steroids are a type of lipid.
3

Peptide bonds are found in proteins, not lipids.

Which of the following is an essential cofactor for catalase?

Calcium
Iron
Zinc
Magnesium
2

Iron is a necessary cofactor for catalase, an enzyme that breaks down hydrogen peroxide.

Which enzyme catalyzes the hydrolysis of lactose into glucose and galactose?

Amylase
Lactase
Maltase
Sucrase
2

Lactase catalyzes the breakdown of lactose into glucose and galactose.

Which polysaccharide is stored in plant tissues as an energy reserve?

Cellulose
Starch
Glycogen
Chitin
2

Starch is the primary storage polysaccharide in plants, serving as an energy reserve.

Which of the following is a conjugated protein?

Albumin
Myosin
Hemoglobin
Keratin
3

Hemoglobin is a conjugated protein because it consists of a protein part and a non-protein heme group.

Which of the following statements is correct about polysaccharides?

Cellulose is a branched polysaccharide.
Glycogen is more branched than starch.
Starch is a polymer of fructose.
Chitin is found only in plants.
2

Glycogen has more branches than starch. Cellulose is unbranched, starch is a polymer of glucose, and chitin is found in fungi and arthropods.

What is the role of chaperone proteins in cells?

Catalyzing metabolic reactions
Assisting in protein folding
Transporting lipids
Synthesizing nucleotides
2

Chaperone proteins assist in the proper folding of newly synthesized proteins.

Which of the following is a property of enzymes?

They are consumed in reactions
They lower activation energy
They work at any temperature
They are non-specific in action
2

Enzymes function by lowering the activation energy of biochemical reactions.

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