Biomolecules
Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following elements is present in the highest percentage in the human body?

Carbon
Oxygen
Nitrogen
Calcium
2

Oxygen is the most abundant element in the human body, constituting about 65% of body weight.

Which secondary metabolite is used as an anticancer drug?

Vinblastine
Morphine
Ricin
Rubber
1

Vinblastine, derived from plants, is used in cancer treatment.

Which of the following enzymes catalyzes the hydrolysis of starch into maltose?

Lipase
Amylase
Pepsin
Protease
2

Amylase catalyzes the breakdown of starch into maltose, a disaccharide.

Which of the following biomolecules contains peptide bonds?

Carbohydrates
Lipids
Proteins
Nucleic acids
3

Proteins are made up of amino acids linked by peptide bonds.

Which enzyme catalyzes the conversion of pyruvate to ethanol in fermentation?

Hexokinase
Lactate dehydrogenase
Alcohol dehydrogenase
Pepsin
3

Alcohol dehydrogenase catalyzes the conversion of pyruvate into ethanol during fermentation.

Which enzyme is responsible for unwinding DNA during replication?

DNA polymerase
Ligase
Helicase
Primase
3

Helicase unwinds the DNA double helix, allowing replication to proceed.

Which nitrogenous base pairs with cytosine in DNA?

Adenine
Guanine
Thymine
Uracil
2

In DNA, cytosine pairs with guanine through three hydrogen bonds.

Which of the following statements about biomolecules is correct?

All biomolecules are polymers.
Proteins are polymers of amino acids.
Lipids are composed of repeating monomers like proteins.
Nucleic acids do not contain nitrogen.
2

Proteins are polymers of amino acids, but not all biomolecules are polymers. Lipids are not true polymers, and nucleic acids contain nitrogen in their bases.

Which of the following statements about nucleic acids is incorrect?

DNA is a polymer of nucleotides.
RNA contains deoxyribose instead of ribose.
DNA contains thymine, whereas RNA contains uracil.
RNA is usually single-stranded.
2

RNA contains ribose sugar, not deoxyribose.

Which of the following statements about enzymes is incorrect?

Enzymes act as biological catalysts.
Enzymes increase the activation energy of a reaction.
Enzymes remain unchanged after the reaction.
Enzymes are highly specific in their function.
2

Enzymes lower the activation energy of reactions, allowing them to proceed more efficiently.

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