Biomolecules
Test 4

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which type of bond connects amino acids in a polypeptide chain?

Glycosidic bond
Peptide bond
Phosphodiester bond
Ionic bond
2

A peptide bond forms between the carboxyl group of one amino acid and the amino group of another during protein synthesis.

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

Glucose
Rubber
Starch
Glycogen
2

Rubber is a secondary metabolite found in plants and does not play a direct role in normal physiological processes.

Which of the following is NOT a type of RNA?

mRNA
tRNA
rRNA
cRNA
4

cRNA (complementary RNA) is not a recognized type of RNA, whereas mRNA, tRNA, and rRNA are essential for protein synthesis.

Which form of RNA carries amino acids to the ribosome during protein synthesis?

mRNA
tRNA
rRNA
snRNA
2

tRNA (transfer RNA) carries amino acids to the ribosome and helps in protein synthesis.

What is the quaternary structure of proteins?

Linear sequence of amino acids
Three-dimensional folding of a single polypeptide
Interaction of multiple polypeptide chains
Formation of alpha-helices and beta-sheets
3

The quaternary structure refers to the arrangement and interaction of multiple polypeptide chains in a functional protein.

Which biomolecule acts as a genetic messenger, transferring information from DNA to ribosomes?

tRNA
mRNA
rRNA
DNA
2

mRNA (messenger RNA) carries genetic information from DNA to ribosomes for protein synthesis.

Which of the following is a disaccharide?

Glucose
Fructose
Maltose
Galactose
3

Maltose is a disaccharide composed of two glucose molecules.

Which of the following is a structural polysaccharide found in arthropod exoskeletons?

Chitin
Glycogen
Starch
Cellulose
1

Chitin is a polysaccharide that forms the exoskeleton of arthropods and fungal cell walls.

Which of the following statements about ATP is incorrect?

ATP is the primary energy currency of cells.
ATP contains ribose sugar.
ATP stores energy in its phosphate bonds.
ATP is a protein.
4

ATP is a nucleotide, not a protein, and it stores energy in its high-energy phosphate bonds.

Which of the following statements about proteins is incorrect?

Proteins are polymers of amino acids linked by peptide bonds.
The sequence of amino acids determines the protein's function.
All proteins function as enzymes.
Proteins can have structural or catalytic roles.
3

Not all proteins function as enzymes; some have structural, transport, or signaling roles.

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