$$3\ \text{Na}^+_{\text{out}} + 2\ \text{K}^+_{\text{in}} + 1\ \text{ATP} \rightarrow 3\ \text{Na}^+_{\text{out}} + 2\ \text{K}^+_{\text{in}}$$

Question 1

Which statement best describes the cell theory?

Accepted Answer

All living organisms are composed of cells, cells are the basic unit of life, and all cells arise from pre-existing cells.

Question 2

Which of the following is NOT one of the three main parts of a typical eukaryotic cell?

Accepted Answer

Mitochondria

Question 3

The fluid mosaic model describes the structure of the plasma membrane. Which feature is most characteristic of this model?

Accepted Answer

Proteins and lipids move freely within the bilayer, creating a dynamic and flexible membrane.

Question 4

How does the arrangement of hydrophilic and hydrophobic regions in the phospholipid bilayer create a semipermeable membrane?

Accepted Answer

Hydrophilic heads face outward toward water, while hydrophobic tails face inward, preventing passage of most polar molecules.

Question 5

Which cell junction allows ions and small molecules to pass directly from one cell to another, facilitating rapid communication?

Accepted Answer

Gap junction

Question 6

Which organelle is responsible for producing ATP through cellular respiration?

Accepted Answer

Mitochondrion

Question 7

What is cytosol?

Accepted Answer

The fluid portion of the cytoplasm that surrounds organelles.

Question 8

Which of the following is a passive process of membrane transport?

Accepted Answer

Facilitated diffusion

Question 9

What is the function of aquaporins in the cell membrane?

Accepted Answer

They facilitate the rapid movement of water across the membrane.

Question 10

A cell is placed in a hypotonic solution. What will most likely happen to the cell?

Accepted Answer

It will swell as water enters the cell.

Question 11

Which statement best describes facilitated diffusion?

Accepted Answer

A passive process where molecules move down their concentration gradient with the help of membrane proteins.

Question 12

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

Accepted Answer

$$3\ 	ext{Na}^+_{	ext{out}} + 2\ 	ext{K}^+_{	ext{in}} + 1\ 	ext{ATP} ightarrow 3\ 	ext{Na}^+_{	ext{out}} + 2\ 	ext{K}^+_{	ext{in}}$$

Question 13

Which process involves the cell membrane engulfing material to bring it into the cell?

Accepted Answer

Endocytosis

Question 14

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

Accepted Answer

S phase of interphase

Question 15

Which description best matches the metaphase stage of mitosis?

Accepted Answer

Chromosomes align at the cell's equator.

Question 16

What does 'semiconservative' mean in DNA replication?

Accepted Answer

Each new DNA molecule consists of one original strand and one new strand.

Question 17

Given the DNA template strand TACTGC, what is the sequence of the new complementary DNA strand?

Accepted Answer

ATGACG

Question 18

What is cytokinesis, and when does it usually occur?

Accepted Answer

Division of the cytoplasm, usually starting during telophase.

Question 19

Which molecule serves as the blueprint for protein synthesis?

Accepted Answer

DNA

Question 20

Given the DNA sequence AAT-CGT-TCG, what is the corresponding mRNA sequence?

Accepted Answer

UUA-GCA-AGC

Anatomy & Physiology: Cell Structure, Membrane Transport, Cell Cycle, and Protein Synthesis Study Guide

Study Guide - Practice Questions