Question 1

Which of the following statements best explains why cells are generally small in size?

Accepted Answer

Smaller cells have a higher surface area to volume ratio, which facilitates efficient exchange of materials with their environment.

Question 2

A scientist observes a cell under a microscope and notes the presence of a nucleoid region, ribosomes, and a plasma membrane, but no membrane-bound organelles. Which type of cell is being observed?

Accepted Answer

Prokaryotic cell

Question 3

Which organelle is primarily responsible for synthesizing lipids and detoxifying drugs in liver cells?

Accepted Answer

Smooth endoplasmic reticulum

Question 4

During cellular respiration, mitochondria convert energy using the following overall chemical equation. Which molecule is the primary energy currency produced?
$$
C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + ?
$$

Accepted Answer

ATP

Question 5

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 6

A mutation disrupts the function of integrin proteins in an animal cell. Which cellular structure would be most directly affected?

Accepted Answer

Extracellular matrix (ECM)

Question 7

Which of the following is NOT a component of the endomembrane system?

Accepted Answer

Mitochondria

Question 8

A freshwater protist uses contractile vacuoles to maintain osmotic balance. What is the primary function of these vacuoles?

Accepted Answer

Pumping excess water out of the cell

Question 9

Which structure in plant cells allows for the direct passage of water, small solutes, and sometimes proteins and RNA between adjacent cells?

Accepted Answer

Plasmodesmata

Question 10

According to the endosymbiont theory, which evidence supports the idea that mitochondria and chloroplasts originated from prokaryotic cells?

Accepted Answer

They contain ribosomes and circular DNA, and are enveloped by a double membrane.

Question 11

Which cytoskeletal component is primarily responsible for separating chromosomes during cell division?

Accepted Answer

Microtubules

Question 12

A cell is observed to have a large central vacuole, chloroplasts, and a cell wall. Which type of cell is this most likely to be?

Accepted Answer

Plant cell

Question 13

Which of the following best describes the role of lysosomes in autophagy?

Accepted Answer

Lysosomes recycle the cell's own organelles and macromolecules by digesting them.

Question 14

Which equation correctly represents the geometric relationship between surface area ($$SA) $$and volume ($$V) $$for a spherical cell of radius $$r$$?

Accepted Answer

$$SA = 4\pi r^2$, V$$ = \frac{4}{3}\pi $$r^3$$

Question 15

Which organelle is most directly involved in the synthesis of glycoproteins?

Accepted Answer

Rough endoplasmic reticulum

Question 16

Which of the following cell junctions is primarily responsible for preventing the leakage of extracellular fluid between animal cells?

Accepted Answer

Tight junctions

Question 17

A patient is diagnosed with a genetic disorder affecting the function of motor proteins. Which cellular process is most likely to be impaired?

Accepted Answer

Vesicle transport along the cytoskeleton

Question 18

Which of the following statements about the plasma membrane is correct?

Accepted Answer

It is a selective barrier that allows passage of oxygen, nutrients, and waste.

Question 19

Which organelle is responsible for converting hydrogen peroxide ($$H_2O_2) $$into water ($$H_2O) in $$animal cells?

Accepted Answer

Peroxisome

Question 20

Which of the following best explains why plant cells do not burst when placed in hypotonic solutions?

Accepted Answer

The cell wall provides structural support and prevents excessive uptake of water.

Chapter 4: A Tour of the Cell – Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard