$$\mathrm{C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{chemical energy}}$$

Question 1

Which of the following best describes the main function of the endomembrane system in eukaryotic cells?

Accepted Answer

It synthesizes and transports proteins and lipids throughout the cell.

Question 2

During the pulse-chase experiment tracing the endomembrane system, which organelle is the first to show labeled proteins after the pulse?

Accepted Answer

Rough endoplasmic reticulum (ER)

Question 3

Which process is primarily responsible for the recycling of damaged organelles within a cell?

Accepted Answer

Autophagy

Question 4

A patient with Tay-Sachs disease has a malfunction in which cellular organelle, leading to the accumulation of undigested lipids?

Accepted Answer

Lysosome

Question 5

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

Accepted Answer

Mitochondrion

Question 6

According to the endosymbiotic theory, which evidence supports the origin of mitochondria and chloroplasts from prokaryotic ancestors?

Accepted Answer

Presence of circular DNA and double membranes

Question 7

Which equation correctly represents cellular respiration occurring in mitochondria?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{chemical energy}}$$

Question 8

Which organelle is responsible for detoxifying alcohol and breaking down fatty acids, often producing hydrogen peroxide as a by-product?

Accepted Answer

Peroxisome

Question 9

Which cytoskeletal element is primarily involved in the movement of chromosomes during cell division?

Accepted Answer

Microtubules

Question 10

What is the main function of the central vacuole in plant cells?

Accepted Answer

Regulating water balance and storing nutrients

Question 11

Which motor protein 'walks' along microtubules toward the plus (+) end, transporting vesicles within the cell?

Accepted Answer

Kinesin

Question 12

Which cytoskeletal structure is composed of actin monomers and is involved in cell shape changes and cytoplasmic streaming?

Accepted Answer

Microfilaments

Question 13

A cell is observed to have a large number of peroxisomes. Which function is this cell most likely specialized for?

Accepted Answer

Detoxification of harmful substances

Question 14

Which organelle is the site of photosynthesis in plant cells?

Accepted Answer

Chloroplast

Question 15

Which equation represents the process of photosynthesis in chloroplasts?

Accepted Answer

$$\mathrm{6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2}$$

Question 16

Which cytoskeletal element is most important for maintaining the position of the nucleus and other organelles within the cell?

Accepted Answer

Intermediate filaments

Question 17

Which of the following is a real-world consequence of lysosomal malfunction in human cells?

Accepted Answer

Accumulation of undigested macromolecules leading to neurodegenerative disease

Question 18

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

Accepted Answer

Golgi apparatus

Question 19

Which of the following statements about the cytoskeleton is TRUE?

Accepted Answer

Microtubules are hollow tubes made of tubulin dimers and are involved in organelle movement.

Question 20

Which cellular structure is the site where microtubules originate and organize during cell division?

Accepted Answer

Centrosome

Cellular Foundations of Life: A Tour of the Cell (Chapter 6) – Endomembrane System and Cytoskeleton

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