Question 1

Which of the following best describes the structure and function of the plasma membrane in eukaryotic cells?

Accepted Answer

It is a dynamic phospholipid bilayer with embedded proteins that regulates the movement of substances into and out of the cell.

Question 2

A newly synthesized protein destined for secretion from a eukaryotic cell would follow which correct pathway?

Accepted Answer

Ribosome (on rough ER) → Golgi apparatus → secretory vesicle → plasma membrane

Question 3

Which organelle is primarily responsible for ATP production in eukaryotic cells, and what is the main process involved?

Accepted Answer

Mitochondrion; cellular respiration

Question 4

Which of the following statements about the nucleolus is correct?

Accepted Answer

It is the site of ribosomal RNA synthesis and ribosome assembly.

Question 5

Which equation correctly represents the change in free energy ($\Delta G$) for a chemical reaction?

Accepted Answer

$\Delta G = \Delta H - T\Delta S$

Question 6

Which of the following best explains why phospholipids are considered amphipathic molecules?

Accepted Answer

They contain both hydrophobic fatty acid tails and hydrophilic phosphate heads.

Question 7

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

Accepted Answer

Water will enter the cell, causing it to swell and possibly burst.

Question 8

Which of the following is a function of the Golgi apparatus?

Accepted Answer

Modification, sorting, and packaging of proteins for secretion or delivery to other organelles

Question 9

Which type of cytoskeletal filament is primarily involved in muscle contraction?

Accepted Answer

Microfilaments (actin filaments)

Question 10

Which of the following best describes the role of the Na$^+$/K$^+$-ATPase pump in animal cells?

Accepted Answer

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

Question 11

Which of the following statements about endergonic and exergonic reactions is correct?

Accepted Answer

Exergonic reactions have a negative $\Delta G$ and release energy, while endergonic reactions have a positive $\Delta G$ and require energy input.

Question 12

Which of the following is a correct description of facilitated diffusion?

Accepted Answer

Passive movement of molecules down their concentration gradient via specific membrane proteins.

Question 13

Which of the following best describes the difference between integral and peripheral membrane proteins?

Accepted Answer

Integral proteins are embedded within the lipid bilayer, while peripheral proteins are loosely attached to the membrane surface.

Question 14

Which of the following is a function of lysosomes in animal cells?

Accepted Answer

Digestion of macromolecules and recycling of cellular components

Question 15

Which of the following statements about the fluid mosaic model of biological membranes is correct?

Accepted Answer

Membranes consist of a phospholipid bilayer with proteins that can move laterally within the layer.

Question 16

Which of the following best explains the effect of temperature on enzyme activity?

Accepted Answer

Enzyme activity increases with temperature up to an optimal point, after which it decreases due to denaturation.

Question 17

Which of the following is a correct statement about the role of microtubules in eukaryotic cells?

Accepted Answer

They form the mitotic spindle and are essential for chromosome separation during cell division.

Question 18

Which of the following best describes the process of phagocytosis?

Accepted Answer

The cell engulfs large particles or microorganisms by forming a vesicle around them.

Question 19

Which of the following is a correct statement about the function of intermediate filaments?

Accepted Answer

They provide mechanical strength and help maintain cell shape.

Question 20

Which of the following best describes the role of tight junctions in animal cells?

Accepted Answer

They prevent the leakage of extracellular fluid across epithelial cell layers.

General Biology Study Guide: Cell Structure, Membranes, and Metabolism

Study Guide - Practice Questions