CLEP Biology Molecular & Cellular Biology 2

Question 1

Which enzyme is responsible for synthesizing RNA from a DNA template during transcription?

Accepted Answer

RNA polymerase

Answer

RNA polymerase reads the DNA template strand and synthesizes a complementary RNA strand during transcription.

Question 2

What is the role of tRNA during translation?

Accepted Answer

Delivers amino acids to the ribosome matching codons

Answer

tRNA molecules carry specific amino acids and deliver them to the ribosome by anticodon-codon base pairing.

Question 3

Which of the following best describes a competitive inhibitor of an enzyme?

Accepted Answer

It binds to the active site and competes with the substrate

Answer

Competitive inhibitors bind reversibly to the active site, directly competing with the substrate for binding.

Question 4

In the fluid mosaic model of membranes, which molecules primarily form the bilayer?

Accepted Answer

Phospholipids

Answer

Phospholipids arrange into a bilayer with hydrophilic heads facing outward and hydrophobic tails inward, forming the membrane's core structure.

Question 5

During which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Answer

DNA replication takes place during the S (synthesis) phase of interphase, before mitosis begins.

CLEP Practice Test