$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2 \rightarrow 6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + \text{energy}$

Question 1

Which of the following best describes the main structural difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have their DNA enclosed within a nucleus, whereas prokaryotic cells have their DNA in a nucleoid region.

Question 2

During glycolysis, what is the net gain of ATP molecules produced per molecule of glucose?

Accepted Answer

$2$

Question 3

Which of the following statements about the endomembrane system is correct?

Accepted Answer

It is responsible for the synthesis, modification, and transport of proteins and lipids within the cell.

Question 4

A scientist is studying a cell that contains a large number of mitochondria. Which of the following is the most likely function of this cell?

Accepted Answer

Production of large amounts of ATP for energy-demanding processes

Question 5

Which equation correctly represents the overall process of cellular respiration?

Accepted Answer

$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2 ightarrow 6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + 	ext{energy}$

Question 6

Which of the following best explains why ATP is considered the 'energy currency' of the cell?

Accepted Answer

ATP can directly transfer a phosphate group to other molecules, releasing energy that can be used for cellular work.

Question 7

A mutation causes a cell to produce a nonfunctional enzyme in the citric acid cycle. Which of the following is a likely consequence?

Accepted Answer

The cell will have reduced ATP production due to impaired processing of acetyl CoA.

Question 8

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation allows glycolysis to continue by regenerating NAD$^+$ in the absence of oxygen.

Question 9

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

Accepted Answer

It provides structural support, enables cell movement, and organizes organelles within the cell.

Question 10

During photosynthesis, which molecule acts as the final electron acceptor in the light reactions?

Accepted Answer

$\mathrm{NADP}^+$

Question 11

A patient is diagnosed with a mitochondrial disorder that impairs the electron transport chain. Which of the following symptoms is most likely?

Accepted Answer

Increased production of lactic acid due to reliance on fermentation

Question 12

Which of the following best explains why enzymes are highly specific for their substrates?

Accepted Answer

Enzymes have active sites with unique shapes that only fit specific substrates.

Question 13

Which of the following is a correct statement about the cell cycle?

Accepted Answer

The cell cycle consists of interphase and mitotic phase, with DNA replication occurring during interphase.

Question 14

Which of the following best describes the role of the Golgi apparatus in the endomembrane system?

Accepted Answer

It modifies, sorts, and packages proteins and lipids for secretion or delivery to other organelles.

Question 15

Which of the following is true regarding the regulation of the cell cycle?

Accepted Answer

Cyclins and cyclin-dependent kinases (CDKs) regulate progression through the cell cycle checkpoints.

Question 16

A cell is observed to have a high concentration of lysosomes. Which of the following is the most likely function of this cell?

Accepted Answer

Digestion and recycling of cellular waste and foreign material

Question 17

Which of the following best explains why the inner mitochondrial membrane is highly folded into cristae?

Accepted Answer

To increase the surface area for electron transport and ATP synthesis

Question 18

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

Accepted Answer

Lipid synthesis and detoxification of harmful substances

Question 19

Which of the following best describes the relationship between catabolic and anabolic pathways in metabolism?

Accepted Answer

Catabolic pathways break down molecules to release energy, while anabolic pathways use energy to build complex molecules.

Question 20

A researcher adds a competitive inhibitor to an enzyme-catalyzed reaction. What is the most likely effect?

Accepted Answer

The inhibitor binds to the active site, preventing substrate binding and decreasing the reaction rate.

General Biology Study Guide: Cells, Energy, and Metabolism (Chapters 7-9)

Study Guide - Practice Questions