Question 1

Which of the following best describes the function of the Golgi apparatus in a eukaryotic cell?

Accepted Answer

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

Question 2

A scientist observes a eukaryotic cell engulfing a large bacterium. Which process is most likely occurring, and which organelle will digest the bacterium?

Accepted Answer

Phagocytosis; lysosome

Question 3

Which of the following statements about the nuclear envelope is correct?

Accepted Answer

It is a double membrane with nuclear pores that regulate the transport of RNA and proteins.

Question 4

During the signal hypothesis, which step ensures that a protein enters the endomembrane system?

Accepted Answer

A signal recognition particle (SRP) binds to the signal sequence and directs the ribosome to the ER membrane.

Question 5

Which type of cell-cell connection in animal tissues allows the direct transfer of ions and small molecules between adjacent cells?

Accepted Answer

Gap junctions

Question 6

A plant cell is placed in a solution containing a signaling molecule. The molecule moves directly from one cell to another through cytoplasmic channels. Which structure is responsible for this transfer?

Accepted Answer

Plasmodesmata

Question 7

Which of the following best describes the role of G-protein-coupled receptors (GPCRs) in cell signaling?

Accepted Answer

They activate G-proteins, which then trigger the production of second messengers inside the cell.

Question 8

Given the equation for Gibbs free energy $$\Delta G = \Delta H - T\Delta S$$, which of the following conditions would make a reaction spontaneous?

Accepted Answer

$$\Delta H is $$negative and $$\Delta S is $$positive

Question 9

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

Accepted Answer

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

Question 10

A researcher finds that increasing substrate concentration no longer increases the rate of an enzyme-catalyzed reaction. What is the most likely explanation?

Accepted Answer

The enzyme has reached substrate saturation; all active sites are occupied.

Question 11

Which of the following is an example of feedback inhibition in cellular respiration?

Accepted Answer

ATP binding to phosphofructokinase to decrease its activity when ATP levels are high.

Question 12

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 13

Which of the following best describes the role of chlorophyll in photosynthesis?

Accepted Answer

It captures light energy and transfers excited electrons to the electron transport chain.

Question 14

Where in the chloroplast do the light-dependent reactions of photosynthesis occur?

Accepted Answer

In the thylakoid membrane

Question 15

Which of the following correctly compares photosynthesis and aerobic cellular respiration?

Accepted Answer

Photosynthesis is endergonic and requires energy input; respiration is exergonic and releases energy.

Question 16

Rubisco is a critical enzyme in plants because it:

Accepted Answer

Catalyzes the fixation of carbon dioxide during the Calvin cycle.

Question 17

A mutation causes a plant's Rubisco enzyme to bind oxygen instead of carbon dioxide more frequently. What is the most likely consequence?

Accepted Answer

Increased photorespiration, leading to decreased carbon fixation

Question 18

Which of the following is a correct sequence of the four steps of cellular respiration in eukaryotic cells?

Accepted Answer

Glycolysis → Pyruvate processing → Citric acid cycle → Electron transport chain

Question 19

Which of the following best describes the difference between catabolic and anabolic pathways?

Accepted Answer

Catabolic pathways break down molecules to release energy; anabolic pathways build complex molecules from simpler ones.

Question 20

A patient is diagnosed with a genetic disorder that prevents the formation of peroxisomes. Which cellular function would be most directly affected?

Accepted Answer

Detoxification of hydrogen peroxide and breakdown of fatty acids

General Biology: Cell Structure, Cell Communication, Metabolism, Respiration, and Photosynthesis

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드