Question 1

Which of the following best describes the function of the sodium-potassium pump in animal cells?

Accepted Answer

It uses ATP to move 3 Na$^+$ ions out of the cell and 2 K$^+$ ions into the cell, both against their concentration gradients.

Question 2

A cell is placed in a solution and begins to shrink. Which type of solution is the cell most likely in, and what is the process called?

Accepted Answer

Hypertonic solution; crenation

Question 3

During transcription, which enzyme binds to the promoter region of DNA to initiate the process?

Accepted Answer

RNA polymerase

Question 4

Which organelle is responsible for modifying, sorting, and packaging proteins and lipids for transport within or outside the cell?

Accepted Answer

Golgi apparatus

Question 5

A drug acts as an antagonist at a receptor. What is the most likely effect?

Accepted Answer

It blocks the receptor, preventing activation by agonists.

Question 6

Which of the following best explains why the plasma membrane is described as 'selectively permeable'?

Accepted Answer

It permits certain molecules or ions to pass while restricting others, maintaining homeostasis.

Question 7

Which structure is responsible for producing ribosomal RNA (rRNA) and assembling ribosome subunits?

Accepted Answer

Nucleolus

Question 8

Which of the following is TRUE regarding the phases of the cell cycle?

Accepted Answer

Interphase includes G1, S, and G2 phases, where the cell grows and prepares for division.

Question 9

Which of the following is a function of microtubules in the cytoskeleton?

Accepted Answer

Forming tracks for organelle movement and being key components of cilia, flagella, and the mitotic spindle.

Question 10

Which of the following best describes the process of osmosis?

Accepted Answer

Movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to higher solute concentration.

Question 11

A mutation occurs in a gene that codes for a cyclin protein. Which of the following is a possible consequence?

Accepted Answer

The cell cycle may become unregulated, potentially leading to uncontrolled cell division and cancer.

Question 12

Which of the following is a correct sequence for the steps of mitosis?

Accepted Answer

Prophase, Metaphase, Anaphase, Telophase

Question 13

Which of the following best describes the difference between chromatin and chromosomes?

Accepted Answer

Chromatin is loose, uncondensed DNA for everyday cell functions; chromosomes are highly condensed DNA for cell division.

Question 14

Which of the following is a key feature of the genetic code?

Accepted Answer

It is universal, nearly the same in all living organisms.

Question 15

Which of the following best describes secondary active transport?

Accepted Answer

It uses the energy stored in the concentration gradient of one molecule to move another molecule against its gradient.

Question 16

Which of the following is TRUE about facilitated diffusion?

Accepted Answer

It moves molecules down their concentration gradient with the help of transport proteins.

Question 17

Which of the following is a function of the smooth endoplasmic reticulum (Smooth ER)?

Accepted Answer

Synthesizes lipids and detoxifies chemicals.

Question 18

Which of the following best describes the role of aquaporins in the cell membrane?

Accepted Answer

They facilitate the rapid movement of water molecules across the membrane.

Question 19

Which of the following is a correct description of the steps in translation?

Accepted Answer

Initiation: Ribosome binds mRNA; Elongation: tRNAs bring amino acids; Termination: Ribosome releases the completed polypeptide.

Question 20

Which of the following is TRUE regarding vesicular transport?

Accepted Answer

Endocytosis brings substances into the cell, while exocytosis releases substances out of the cell.

Cell Structure, Function, and Processes: Study Notes for Anatomy & Physiology

Study Guide - Practice Questions