Question 1

Which of the following statements best summarizes a key component of the modern cell theory?

Accepted Answer

All living organisms are composed of one or more cells.

Question 2

A scientist is comparing a prokaryotic cell to a eukaryotic cell. Which of the following features is found ONLY in eukaryotic cells?

Accepted Answer

A nucleus containing the cell's genetic material

Question 3

Which organelle is primarily responsible for packaging and modifying proteins for secretion or delivery to other organelles?

Accepted Answer

Golgi apparatus

Question 4

A plant cell is observed to have a large, membrane-bound compartment that stores water, ions, and waste products. What is this structure called, and what is its primary function?

Accepted Answer

Central vacuole; storage and maintenance of turgor pressure

Question 5

Which of the following best describes the function of the cytoskeleton in eukaryotic cells?

Accepted Answer

It provides structural support, facilitates cell movement, and assists in intracellular transport.

Question 6

Which equation correctly represents Gibbs' Free Energy change for a reaction?

Accepted Answer

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

Question 7

A reaction in a cell has a $$\Delta G$$ value of $$-30 kJ/$$mol. Which of the following best describes this reaction?

Accepted Answer

It is exergonic and releases free energy.

Question 8

Which of the following statements correctly distinguishes between catabolic and anabolic pathways?

Accepted Answer

Catabolic pathways break down molecules and release energy, while anabolic pathways build molecules and require energy.

Question 9

ATP is often called the 'energy currency' of the cell. Which feature of ATP allows it to transfer energy to other molecules?

Accepted Answer

The hydrolysis of its terminal phosphate group releases energy that can be coupled to endergonic reactions.

Question 10

Which of the following best describes the role of coenzymes in metabolism?

Accepted Answer

They act as organic molecules that assist enzymes by carrying electrons or functional groups during reactions.

Question 11

During a redox reaction in cellular respiration, which molecule is being reduced?

Accepted Answer

The molecule that gains electrons

Question 12

Which of the following best explains how enzymes increase the rate of chemical reactions?

Accepted Answer

They lower the activation energy required for the reaction to proceed.

Question 13

A patient has a fever of 41°C. How might this elevated temperature affect the activity of most human enzymes?

Accepted Answer

Enzyme activity will likely decrease due to denaturation at high temperatures.

Question 14

Which of the following is an example of feedback inhibition in a metabolic pathway?

Accepted Answer

The end product of a pathway binds to an enzyme early in the pathway, decreasing its activity.

Question 15

Which of the following best describes the main purpose of cellular respiration in eukaryotic cells?

Accepted Answer

To convert the chemical energy in glucose into ATP for cellular work

Question 16

During aerobic respiration, what is the final electron acceptor in the electron transport system (ETS)?

Accepted Answer

Oxygen ($$O_2)$$

Question 17

Which of the following correctly lists the three major pathways of aerobic respiration in the order they occur?

Accepted Answer

Glycolysis, Krebs cycle, Electron transport system

Question 18

A glucose molecule ($$C_6H_{12}O_6$) is fully oxidized during aerobic respiration. What happens to its six carbon atoms?

Accepted Answer

They are released as six molecules of carbon dioxide ($$CO_2).$$

Question 19

How does ATP synthase produce ATP during chemiosmosis in mitochondria?

Accepted Answer

By using the energy from the flow of $$H^+$$ ions down their concentration gradient to catalyze the formation of ATP from ADP and $$P_i$$

Question 20

Which of the following best explains how the electron transport system (ETS) maintains the $$H^+$$ concentration gradient across the inner mitochondrial membrane?

Accepted Answer

By using the energy from electron transfer to actively pump $$H^+$$ ions from the matrix to the intermembrane space

General Biology Study Guide: Cell Structure, Metabolism, and Cellular Respiration

Guida di studio - Domande di pratica

Study guide - Flashcard