Question 1

Which of the following best describes the process of osmosis in biological systems?

Accepted Answer

Movement of water molecules from areas of high concentration to areas of low concentration across a selectively permeable membrane.

Question 2

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

Accepted Answer

The cell will gain water, causing the cell wall to become turgid.

Question 3

Which organelle is primarily responsible for producing ATP in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 4

Which of the following statements about prokaryotic cells is TRUE?

Accepted Answer

Prokaryotes have DNA located in a region called the nucleoid, but lack a true nucleus.

Question 5

Facilitated diffusion differs from simple diffusion in that:

Accepted Answer

Facilitated diffusion requires specific transport proteins to move molecules across the membrane.

Question 6

Which equation correctly represents the relationship between free energy change ($\Delta G$), enthalpy change ($\Delta H$), temperature ($T$), and entropy change ($\Delta S$) in a biological system?

Accepted Answer

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

Question 7

Which of the following is a function of the rough endoplasmic reticulum (RER)?

Accepted Answer

Protein synthesis and modification for export out of the cell

Question 8

A mutation prevents the formation of desmosomes in epithelial cells. Which cellular function would be most directly affected?

Accepted Answer

Adhesion between adjacent cells, reducing tissue integrity

Question 9

Which process allows viruses to permanently insert their genetic material into the host cell's DNA?

Accepted Answer

Reverse transcription

Question 10

Which of the following best explains why antibiotics are ineffective against viruses?

Accepted Answer

Viruses do not have metabolic machinery or cell structures targeted by antibiotics.

Question 11

A scientist observes that a cell is able to move large particles into the cell by engulfing them in vesicles. Which process is being observed?

Accepted Answer

Endocytosis

Question 12

Which of the following is TRUE about the plasma membrane?

Accepted Answer

It is a selectively permeable barrier composed of phospholipids, proteins, and cholesterol.

Question 13

Which of the following is a real-world example of active transport in human physiology?

Accepted Answer

Uptake of glucose from the gut into intestinal cells against its concentration gradient

Question 14

Which structure in plant cells is responsible for maintaining cell rigidity and is absent in animal cells?

Accepted Answer

Cell wall

Question 15

Which of the following statements about mitochondria is CORRECT?

Accepted Answer

Mitochondria contain their own DNA and are involved in energy production.

Question 16

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

Accepted Answer

They are channels that allow direct communication between adjacent plant cells.

Question 17

Which process is responsible for the amplification of signals in cell signaling pathways, often involving a second messenger?

Accepted Answer

Signal transduction

Question 18

Which of the following is a key difference between steroid hormones and peptide hormones?

Accepted Answer

Steroid hormones are derived from cholesterol and can cross cell membranes, while peptide hormones are hydrophilic and bind to surface receptors.

Question 19

Which of the following best explains why the extracellular matrix (ECM) is important for multicellular organisms?

Accepted Answer

It facilitates cell adhesion, communication, and provides structural support.

Cell Structure, Function, and Signaling: General Biology Study Guide

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