Biomolecules
Test 2

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which type of biomolecule is responsible for catalyzing biochemical reactions in cells?

Carbohydrates
Lipids
Proteins
Nucleic acids
3

Proteins function as enzymes that catalyze biochemical reactions in living organisms.

Which of the following is NOT a function of proteins?

Structural support
Enzyme activity
Genetic information storage
Hormonal function
3

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

Which type of biomolecule includes steroid hormones?

Proteins
Carbohydrates
Lipids
Nucleic acids
3

Steroid hormones, such as testosterone and estrogen, are classified as lipids.

Which component of a nucleotide differentiates RNA from DNA?

Phosphate group
Nitrogenous base
Pentose sugar
Both B and C
3

RNA contains ribose, whereas DNA contains deoxyribose. The presence of ribose differentiates RNA from DNA.

Which of the following amino acids contains a sulfur atom?

Glycine
Alanine
Cysteine
Proline
3

Cysteine contains sulfur and can form disulfide bonds, stabilizing protein structure.

Which enzyme catalyzes the interconversion of isomers?

Hydrolase
Ligase
Isomerase
Oxidoreductase
3

Isomerases catalyze the interconversion of isomeric forms of molecules.

Which of the following statements about lipids is true?

They are polymers
They are soluble in water
They are involved in membrane formation
They contain phosphodiester bonds
3

Lipids are important components of cell membranes, forming the lipid bilayer structure.

Which enzyme catalyzes the fixation of carbon dioxide in the Calvin cycle?

Pepsin
RuBisCO
Hexokinase
Lipase
2

RuBisCO (Ribulose-1,5-bisphosphate carboxylase-oxygenase) is the enzyme responsible for fixing carbon dioxide in the Calvin cycle.

Which of the following statements about DNA and RNA is incorrect?

DNA contains thymine, whereas RNA contains uracil.
RNA is usually single-stranded, while DNA is double-stranded.
DNA is made up of amino acids.
RNA contains ribose sugar instead of deoxyribose.
3

DNA is made up of nucleotides, not amino acids.

Which of the following statements about enzymes is correct?

Enzymes alter the equilibrium of a reaction.
Enzymes lower the activation energy of a reaction.
Enzymes are consumed during the reaction.
Enzymes cannot be regulated by inhibitors.
2

Enzymes lower the activation energy of reactions but do not alter their equilibrium.

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