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  4. Biomolecules Chapter-Wise Test 2

Biomolecules Chapter-Wise Test 2

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about ATP is incorrect?

ATP is an energy carrier in cells.
ATP contains three phosphate groups.
ATP is a protein that catalyzes reactions.
ATP releases energy when a phosphate bond is broken.
3

ATP is a nucleotide, not a protein, and does not act as an enzyme.

Which of the following statements about lipids is incorrect?

Lipids are insoluble in water.
Lipids function as a primary energy source.
Lipids form structural components of cell membranes.
Lipids contain peptide bonds.
4

Lipids do not contain peptide bonds; these are found in proteins.

Which nitrogenous base is found in RNA but absent in DNA?

Adenine
Guanine
Thymine
Uracil
4

Uracil replaces thymine in RNA, whereas thymine is present in DNA.

Which of the following components is found in DNA but NOT in RNA?

Ribose
Thymine
Uracil
Adenine
2

DNA contains thymine, whereas RNA contains uracil instead of thymine.

Which of the following bonds holds nucleotides together in a DNA strand?

Peptide bond
Glycosidic bond
Phosphodiester bond
Hydrogen bond
3

Phosphodiester bonds link nucleotides in a DNA strand by joining the phosphate group of one nucleotide to the sugar of another.

Which of the following is a characteristic of enzymes?

They are consumed in reactions
They lower activation energy
They function only at high temperatures
They catalyze all chemical reactions
2

Enzymes function by lowering the activation energy required for biochemical reactions.

Which of the following statements about carbohydrates is incorrect?

Glucose is a monosaccharide.
Sucrose is a polymer of glucose.
Starch is a storage polysaccharide in plants.
Cellulose provides structural support in plant cell walls.
2

Sucrose is a disaccharide composed of glucose and fructose, not a polymer of glucose.

Which of the following statements about lipids is correct?

Lipids are hydrophobic molecules.
Lipids are polymers like proteins and nucleic acids.
Lipids do not play any structural role in cells.
Lipids are highly soluble in water.
1

Lipids are hydrophobic and do not dissolve in water. They are not polymers and play structural roles, such as forming cell membranes.

Which of the following statements about proteins is incorrect?

Proteins are composed of amino acids linked by peptide bonds.
Proteins serve as enzymes, structural components, and hormones.
Proteins store genetic information in cells.
The function of a protein is determined by its three-dimensional structure.
3

Proteins do not store genetic information; nucleic acids (DNA and RNA) perform this function.

Which enzyme is responsible for breaking peptide bonds in proteins?

Amylase
Lipase
Protease
Ligase
3

Proteases (also called peptidases) break peptide bonds in proteins.

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