Biomolecules
Test 5

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is a homopolymer?

Proteins
DNA
RNA
Cellulose
4

Cellulose is a homopolymer composed of repeating glucose units.

What type of chemical bond joins monosaccharides in polysaccharides?

Peptide bond
Glycosidic bond
Phosphodiester bond
Hydrogen bond
2

Glycosidic bonds connect monosaccharides to form polysaccharides.

Which of the following is a secondary structure of proteins?

Alpha-helix
Beta-pleated sheet
Both A and B
Quaternary structure
3

The secondary structure of proteins includes both alpha-helices and beta-pleated sheets, which are stabilized by hydrogen bonds.

Which of the following statements about DNA is correct?

It contains uracil instead of thymine
It is single-stranded
It contains deoxyribose sugar
It is made up of amino acids
3

DNA contains deoxyribose sugar, whereas RNA contains ribose sugar.

Which polysaccharide is present in the exoskeleton of arthropods?

Starch
Cellulose
Chitin
Glycogen
3

Chitin is a polysaccharide found in the exoskeleton of arthropods.

What is the primary function of phospholipids in cells?

Energy storage
Structural component of membranes
Catalysis of reactions
Genetic information storage
2

Phospholipids are key structural components of cell membranes, forming the lipid bilayer.

Which organic molecule forms the primary structural component of plant cell walls?

Starch
Glycogen
Cellulose
Chitin
3

Cellulose, a polysaccharide, is the primary structural component of plant cell walls.

Which of the following statements about proteins is correct?

Proteins are composed of long chains of fatty acids.
Proteins can function as enzymes.
Proteins do not have any structural role in cells.
Proteins are composed only of carbon and hydrogen.
2

Proteins serve multiple roles, including enzymatic functions, structural support, and transport.

Which of the following statements about DNA is correct?

DNA contains the nitrogenous base uracil.
DNA has a double-helix structure.
DNA is made up of amino acids.
DNA is a polymer of fatty acids.
2

DNA has a double-helix structure and is composed of nucleotides, not amino acids or fatty acids.

Which of the following statements about proteins is incorrect?

Proteins are composed of amino acids.
Proteins can function as enzymes.
Proteins are used for genetic information storage.
Proteins provide structural support in cells.
3

Proteins do not store genetic information; that function belongs to nucleic acids.

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