Biomolecules Chapter-Wise Test 12

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about polysaccharides is correct?

Starch and glycogen serve as energy storage molecules.
Chitin is a storage polysaccharide.
Glycogen is found only in plants.
Cellulose is easily digestible by humans.
1

Starch (plants) and glycogen (animals) are storage polysaccharides. Chitin is structural, and humans cannot digest cellulose.

Which of the following is NOT a component of a nucleotide?

Phosphate group
Nitrogenous base
Amino acid
Pentose sugar
3

A nucleotide consists of a phosphate group, a nitrogenous base, and a pentose sugar, but not an amino acid.

Which of the following macromolecules contains phosphodiester bonds?

Proteins
Carbohydrates
Nucleic acids
Lipids
3

Nucleic acids (DNA and RNA) contain phosphodiester bonds that link nucleotides together.

Which of the following statements about carbohydrates is correct?

Cellulose is a structural polysaccharide in plants.
Glycogen is a storage polysaccharide found in plants.
Starch is composed of fructose monomers.
Chitin is found only in plants.
1

Cellulose provides structural support in plants. Glycogen is found in animals, starch is made of glucose, and chitin is found in fungi and arthropods.

Which of the following statements about amino acids is correct?

Amino acids are linked by phosphodiester bonds.
Amino acids contain an amino group and a carboxyl group.
Amino acids are the building blocks of nucleic acids.
Amino acids do not contain nitrogen.
2

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

Which type of enzyme inhibition occurs when an inhibitor binds to the enzyme at a site other than the active site?

Competitive inhibition
Non-competitive inhibition
Uncompetitive inhibition
Allosteric activation
2

In non-competitive inhibition, the inhibitor binds to a site other than the active site, altering the enzyme's function.

Which of the following statements about amino acids is correct?

Amino acids are the monomers of nucleic acids.
All amino acids contain an amino group and a carboxyl group.
Amino acids do not contain nitrogen.
Amino acids are linked by glycosidic bonds.
2

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

Which of the following elements is a major component of nucleic acids but is not found in carbohydrates?

Carbon
Oxygen
Nitrogen
Hydrogen
3

Nitrogen is a key component of nucleic acids (DNA & RNA) but is absent in carbohydrates.

Which type of chemical reaction involves the removal of a water molecule to form a new bond?

Hydrolysis
Oxidation
Condensation
Reduction
3

Condensation reactions involve the removal of water to form bonds, such as peptide and glycosidic bonds.

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.

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