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

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

Question 1

Which of the following best describes the main function of the mitochondrion as depicted in the electron transport chain diagram?

Accepted Answer

Production of ATP through oxidative phosphorylation

Question 2

During autophagy, which organelle fuses with the autophagosome to degrade its contents?

Accepted Answer

Lysosome

Question 3

Which cytoskeletal element is primarily responsible for the movement of vesicles along tracks within the cell, as shown in the kinesin-microtubule diagram?

Accepted Answer

Microtubules

Question 4

What is the primary role of tight junctions in animal tissues?

Accepted Answer

Preventing fluid from moving across a layer of cells

Question 5

Which pathway allows water and solutes to move through the cell wall but not through the cytoplasm in plant cells?

Accepted Answer

Apoplastic pathway

Question 6

Which of the following best describes the structure of the plasma membrane as shown in the lipid bilayer diagram?

Accepted Answer

A double layer of phospholipids with hydrophobic tails facing inward

Question 7

Facilitated diffusion across the plasma membrane, as shown in the carrier protein diagram, requires which of the following?

Accepted Answer

A concentration gradient

Question 8

Which type of membrane protein is responsible for the rapid movement of water molecules across the cell membrane?

Accepted Answer

Aquaporins

Question 9

A red blood cell placed in a hypotonic solution will:

Accepted Answer

Lyse due to water influx

Question 10

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

Accepted Answer

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

Question 11

Which process is illustrated by the movement of a solid particle into a cell via pseudopodia, forming a phagosome?

Accepted Answer

Phagocytosis

Question 12

Which of the following best explains why plant cells become turgid in a hypotonic solution?

Accepted Answer

The cell wall prevents excessive expansion as water enters

Question 13

Which of the following is a function of membrane proteins as shown in the diagrams?

Accepted Answer

Signal transduction

Question 14

Which cytoskeletal structure is directly involved in chromosome movement during cell division?

Accepted Answer

Microtubules

Question 15

Which of the following best describes the role of desmosomes in animal tissues?

Accepted Answer

Anchoring cells together to provide mechanical stability

Question 16

Which of the following is true regarding the movement of vesicles by motor proteins?

Accepted Answer

It requires the hydrolysis of ATP for energy

Question 17

Which of the following best describes the function of gap junctions?

Accepted Answer

Allowing direct communication between adjacent animal cells

Question 18

Which of the following is a correct statement about the proton pump and cotransport system shown in the diagram?

Accepted Answer

The proton pump uses ATP to move $$\mathrm{H}^+$$ ions against their gradient

Question 19

Which of the following best describes the function of plasmodesmata in plant cells?

Accepted Answer

They allow direct cytoplasmic exchange between adjacent cells

Eukaryotic Cell Structures & Functions: Membranes, Organelles, and Transport

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