Q: The sodium-potassium pump moves ions against their concentration gradients. Which equation correctly represents the action of this pump?

$3\ \mathrm{Na}^+\ \text{out} + 2\ \mathrm{K}^+\ \text{in} + \text{ATP} \rightarrow$

Question 1

Which of the following best explains why the phospholipid bilayer of the plasma membrane is selectively permeable to certain molecules?

Accepted Answer

The amphipathic nature of phospholipids allows small, nonpolar molecules to diffuse while restricting large or charged molecules.

Question 2

A patient is given an intravenous solution that is hypertonic compared to their blood plasma. What is the most likely effect on their red blood cells?

Accepted Answer

Water will move out of the cells, causing them to shrink (crenate).

Question 3

Which organelle is primarily responsible for synthesizing proteins that are destined for secretion from the cell?

Accepted Answer

Rough endoplasmic reticulum

Question 4

The sodium-potassium pump moves ions against their concentration gradients. Which equation correctly represents the action of this pump?

Accepted Answer

$3\ \mathrm{Na}^+\ 	ext{out} + 2\ \mathrm{K}^+\ 	ext{in} + 	ext{ATP} ightarrow$

Question 5

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of larger or polar molecules via transport proteins down their concentration gradient without energy input.

Question 6

A cell is placed in an isotonic solution. What will happen to the cell's volume?

Accepted Answer

The cell's volume will remain unchanged as there is no net movement of water.

Question 7

Which membrane component is most directly involved in cell recognition and communication?

Accepted Answer

Glycolipids and glycoproteins

Question 8

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

Accepted Answer

S phase

Question 9

Which of the following is NOT a function of the Golgi apparatus?

Accepted Answer

Synthesizing proteins

Question 10

A cell needs to import large particles such as bacteria. Which transport mechanism will it most likely use?

Accepted Answer

Endocytosis (specifically phagocytosis)

Question 11

Which of the following statements about passive transport is correct?

Accepted Answer

It includes simple diffusion, facilitated diffusion, and osmosis.

Question 12

Which organelle is the primary site of ATP production via cellular respiration?

Accepted Answer

Mitochondria

Question 13

What is the main function of lysosomes in a cell?

Accepted Answer

Digesting cellular waste and foreign material

Question 14

Which process involves the movement of water across a selectively permeable membrane?

Accepted Answer

Osmosis

Question 15

Which of the following best describes secondary active transport?

Accepted Answer

Uses energy from the movement of another substance down its gradient to move a different substance against its gradient

Question 16

Which type of membrane protein spans the entire membrane and often functions as a channel or carrier?

Accepted Answer

Integral protein

Question 17

A cell is exposed to a toxin that inhibits ATP production. Which transport process will be most directly affected?

Accepted Answer

Primary active transport

Question 18

Which of the following is a correct sequence of events in protein synthesis?

Accepted Answer

Transcription occurs in the nucleus, followed by translation in the cytoplasm.

Question 19

Which of the following factors would NOT increase the rate of diffusion across a cell membrane?

Accepted Answer

Decreasing membrane permeability

Question 20

Which of the following best describes the function of the glycocalyx?

Accepted Answer

It aids in cell recognition, signaling, and protection.

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