Biomolecules Chapter-Wise Test 10

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about nucleotides is correct?

Nucleotides consist of a sugar, phosphate group, and nitrogenous base.
Nucleotides do not contain phosphorus.
Nucleotides are the building blocks of proteins.
DNA does not contain nucleotides.
1

Nucleotides consist of a pentose sugar, phosphate group, and nitrogenous base and serve as the building blocks of nucleic acids.

Which of the following is an example of a secondary metabolite?

Glucose
Ribulose bisphosphate
Starch
Morphine
4

Morphine is a secondary metabolite, commonly found in plants, and has medicinal properties.

Which of the following statements about lipids is correct?

Lipids are hydrophobic molecules.
Lipids contain nitrogen as a major component.
Lipids have peptide bonds like proteins.
Lipids dissolve easily in water.
1

Lipids are hydrophobic and do not dissolve in water. They do not contain nitrogen as a major component or peptide bonds.

Which of the following is an example of a heteropolymer?

Cellulose
Glycogen
Protein
Starch
3

Proteins are heteropolymers as they are composed of different amino acids.

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 enzyme is responsible for synthesizing DNA from a template strand?

DNA polymerase
RNA polymerase
Ligase
Helicase
1

DNA polymerase is the enzyme responsible for synthesizing new DNA strands during replication.

Which of the following statements about enzymes is incorrect?

Enzymes catalyze reactions by lowering activation energy.
Enzymes are consumed in the reaction and cannot be reused.
Enzymes are highly specific to their substrates.
Enzymes can be regulated by inhibitors and activators.
2

Enzymes are not consumed in reactions; they remain unchanged and can be reused.

Which of the following statements about nucleotides is correct?

Nucleotides are composed of a phosphate group, a nitrogenous base, and a sugar.
Nucleotides do not contain any phosphorus.
DNA contains ribose sugar instead of deoxyribose.
RNA does not contain nitrogenous bases.
1

Nucleotides consist of a phosphate group, a nitrogenous base, and a sugar. They contain phosphorus, DNA contains deoxyribose, and RNA contains nitrogenous bases.

Which of the following statements about phospholipids is correct?

Phospholipids are components of cell membranes.
Phospholipids contain peptide bonds.
Phospholipids store genetic information.
Phospholipids are composed of amino acids.
1

Phospholipids form the bilayer structure of cell membranes but do not contain peptide bonds or store genetic information.

Which of the following is an example of a reducing sugar?

Sucrose
Glucose
Starch
Cellulose
2

Glucose is a reducing sugar as it has a free aldehyde or ketone group that can donate electrons.

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