Question 1

Which of the following best describes the role of the template strand during transcription?

Accepted Answer

It is used by RNA polymerase to synthesize a complementary mRNA strand.

Question 2

A mutation changes the DNA triplet from TAC to TGC. Using the genetic code, what amino acid will now be incorporated into the protein?

Accepted Answer

Cysteine

Question 3

Which process is responsible for removing introns and splicing exons together in mRNA before it leaves the nucleus?

Accepted Answer

RNA processing

Question 4

During translation, what is the function of the tRNA anticodon?

Accepted Answer

It binds to a complementary mRNA codon to ensure the correct amino acid is added.

Question 5

Which of the following substances would most likely cross the plasma membrane by simple diffusion?

Accepted Answer

Oxygen (O$$_2)$$

Question 6

A red blood cell is placed in a hypotonic solution. What is the most likely outcome?

Accepted Answer

The cell will swell and may undergo hemolysis.

Question 7

Which equation best represents the net movement of molecules during diffusion?

Accepted Answer

$$J = -D \frac{dC}{dx}$$

Question 8

Which of the following is true about the sodium–potassium exchange pump?

Accepted Answer

It moves 3 Na$$^+$$ out of the cell and 2 K$$^+$$ into the cell using 1 ATP.

Question 9

Which type of membrane transport requires energy and moves substances against their concentration gradient?

Accepted Answer

Active transport

Question 10

A cell is placed in a hypertonic solution. What will happen to the cell?

Accepted Answer

It will lose water and shrink (crenation).

Question 11

Which of the following best describes secondary active transport?

Accepted Answer

It uses the energy from the movement of one substance down its gradient to transport another substance against its gradient.

Question 12

Which phase of the cell cycle is characterized by DNA replication?

Accepted Answer

S phase

Question 13

What is the primary function of receptor-mediated endocytosis?

Accepted Answer

To selectively import specific molecules bound to receptors into the cell.

Question 14

Which of the following best explains why water moves more rapidly across the plasma membrane than solutes during osmosis?

Accepted Answer

There are more aquaporins (water channels) than solute channels in the membrane.

Question 15

Which of the following is a real-life example of facilitated diffusion?

Accepted Answer

Glucose entering a muscle cell via a carrier protein.

Question 16

Which of the following is NOT a characteristic of carrier-mediated transport?

Accepted Answer

It is always energy-dependent.

Question 17

What is the significance of the resting membrane potential in cells?

Accepted Answer

It represents the separation of positive and negative charges across the plasma membrane.

Question 18

Which of the following best describes cellular differentiation?

Accepted Answer

Cells turn off genes not needed for their specific function.

Question 19

Which of the following is a key difference between benign and malignant tumors?

Accepted Answer

Malignant tumors invade surrounding tissues and can metastasize.

Question 20

Which of the following factors can inhibit cell division?

Accepted Answer

Worn out telomeres

Cellular Level of Organization: Structure, Function, and Processes

Study Guide - Practice Questions