OAT Cell and Molecular Biology Questions and Answers

Question 1

A cell biologist is studying a cell line that has a diminished capacity to synthesize lipids and detoxify certain drugs.
Microscopic examination reveals a significant reduction in the abundance of a specific organelle.
Which of the following organelles is most likely deficient in these cells?

Accepted Answer

Smooth endoplasmic reticulum

Answer

Golgi apparatus

Answer

Lysosome

Answer

Rough endoplasmic reticulum

Question 2

During the process of transcription in a eukaryotic cell, which enzyme is responsible for synthesizing a pre-mRNA molecule by reading the DNA template strand?

Accepted Answer

RNA Polymerase II

Answer

DNA Polymerase III

Answer

Helicase

Answer

Primase

Question 3

Which of the following events is a key distinguishing feature of Meiosis I when compared to Mitosis?

Accepted Answer

Synapsis of homologous chromosomes

Answer

Separation of sister chromatids

Answer

Formation of a spindle apparatus

Answer

Condensation of chromatin

Question 4

A scientist develops a new drug that binds to an enzyme at a location other than the active site. This binding event changes the enzyme's three-dimensional shape, rendering it inactive. What type of inhibition does this scenario describe?

Accepted Answer

Noncompetitive inhibition

Answer

Competitive inhibition

Answer

Feedback inhibition

Answer

Irreversible inhibition

Question 5

The sodium-potassium pump is a crucial protein for maintaining cellular membrane potential. It actively transports three sodium ions out of the cell for every two potassium ions it transports into the cell. This process directly requires which of the following?

Accepted Answer

Hydrolysis of ATP

Answer

Facilitated diffusion

Answer

Osmosis

Answer

A hypertonic extracellular environment

Question 6

The primary structure of a protein is ultimately determined by which of the following?

Accepted Answer

The sequence of amino acids

Answer

Hydrogen bonding between backbone atoms

Answer

Interactions between R-groups

Answer

The arrangement of multiple polypeptide subunits

A cell biologist is studying a cell line that has a diminished capacity to synthesize lipids and detoxify certain drugs.Microscopic examination reveals a significant reduction in the abundance of a specific organelle.Which of the following organelles is most likely deficient in these cells?

A cell biologist is studying a cell line that has a diminished capacity to synthesize lipids and detoxify certain drugs.
Microscopic examination reveals a significant reduction in the abundance of a specific organelle.
Which of the following organelles is most likely deficient in these cells?