Biomolecules
Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following biomolecules is NOT a polymer?

Protein
Lipid
Nucleic acid
Polysaccharide
2

Lipids are not true polymers because they are not made of repeating monomeric units like proteins, nucleic acids, and polysaccharides.

Which type of bond stabilizes the secondary structure of proteins?

Ionic bond
Hydrogen bond
Peptide bond
Phosphodiester bond
2

Hydrogen bonds stabilize the alpha-helix and beta-sheet structures in the secondary structure of proteins.

Which of the following elements is a component of all amino acids?

Phosphorus
Nitrogen
Sulfur
Chlorine
2

Nitrogen is a key element found in the amino group (-NH₂) of all amino acids.

Which of the following is an example of a prosthetic group in an enzyme?

Heme
NAD+
ATP
Glucose
1

Heme is a prosthetic group in enzymes like peroxidase and catalase, assisting in enzymatic function.

Which of the following is a reducing sugar?

Sucrose
Glucose
Cellulose
Starch
2

Glucose is a reducing sugar because it has a free aldehyde or ketone group capable of donating electrons.

Which of the following is a conjugated protein?

Collagen
Hemoglobin
Keratin
Actin
2

Hemoglobin is a conjugated protein that contains a non-protein component, heme.

Which of the following is an example of a storage polysaccharide?

Cellulose
Chitin
Glycogen
Peptidoglycan
3

Glycogen is a storage polysaccharide in animals, stored mainly in liver and muscle cells.

Which sugar is a component of RNA but NOT DNA?

Glucose
Deoxyribose
Ribose
Fructose
3

Ribose is found in RNA, while deoxyribose is found in DNA. The absence of an oxygen atom in deoxyribose differentiates it from ribose.

Which of the following statements about enzymes is correct?

Enzymes are consumed in reactions and cannot be reused.
Enzymes work by increasing the activation energy of reactions.
Enzymes provide an alternative reaction pathway with lower activation energy.
All enzymes work efficiently at any temperature.
3

Enzymes lower the activation energy and provide an alternative reaction pathway. They are not consumed in reactions.

Which of the following statements about proteins is incorrect?

Proteins are composed of amino acids.
Proteins store genetic information in cells.
Proteins can function as enzymes.
Proteins have structural roles in cells.
2

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

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