Question 1

Which of the following is a defining feature that distinguishes eukaryotic cells from prokaryotic cells?

Accepted Answer

Presence of a membrane-bound nucleus

Question 2

According to the endosymbiotic theory, which organelle is believed to have originated from an aerobic bacterium engulfed by an ancestral archaeal cell?

Accepted Answer

Mitochondrion

Question 3

Which of the following molecules can most efficiently cross a biological membrane by simple diffusion?

Accepted Answer

O$_2$

Question 4

A mutation causes the loss of all ribosomes from the rough endoplasmic reticulum (ER). Which process would be most directly affected?

Accepted Answer

Synthesis of transmembrane proteins

Question 5

Which of the following statements about lysosomes is correct?

Accepted Answer

They contain acid hydrolases that are only active at low pH

Question 6

Which of the following best describes the function of the vacuolar ATPase (v-ATPase) in lysosomes?

Accepted Answer

It facilitates active transport of protons into the lysosome lumen

Question 7

Which of the following molecules does NOT require a channel or transporter to cross the nuclear envelope?

Accepted Answer

Estrogen (steroid hormone)

Question 8

Which of the following is a function of the Golgi apparatus?

Accepted Answer

Protein glycosylation and sorting

Question 9

A cell is placed in a solution with a high concentration of Na$^+$ ions outside and a low concentration inside. If the cell membrane is impermeable to Na$^+$ except through a specific channel, what type of transport will occur when the channel opens?

Accepted Answer

Passive transport down the concentration gradient

Question 10

Which of the following best explains why organelles are surrounded by membranes?

Accepted Answer

To segregate biochemical reactions and maintain distinct chemical environments

Question 11

Which of the following statements about membrane fluidity is correct?

Accepted Answer

Organelle membranes are generally more fluid than the plasma membrane

Question 12

Which of the following best describes the movement of glucose across the plasma membrane?

Accepted Answer

It requires a transporter protein for facilitated diffusion

Question 13

Which of the following is a real-life example of an electrochemical gradient being used for energy generation in eukaryotic cells?

Accepted Answer

Oxidative phosphorylation in mitochondria

Question 14

Which of the following statements about eukaryotic ribosomes is correct?

Accepted Answer

They are larger (80S) than prokaryotic ribosomes (70S)

Question 15

Which of the following best describes the function of nuclear pores?

Accepted Answer

They regulate transport of macromolecules between the nucleoplasm and cytosol

Question 16

Which of the following molecules would be LEAST likely to cross a biological membrane by simple diffusion?

Accepted Answer

Cl$^-$

Question 17

A patient is diagnosed with a genetic disorder that prevents the acidification of lysosomes. Which cellular process would be most directly impaired?

Accepted Answer

Degradation of macromolecules

Question 18

Which of the following best describes the role of the smooth endoplasmic reticulum (ER)?

Accepted Answer

Lipid synthesis and metabolism

Question 19

Which of the following is a consequence of the compartmentalization of eukaryotic cells?

Accepted Answer

Spatial regulation of biochemical reactions

Question 20

Which of the following best explains why steroid hormones can enter the nucleus without the need for nuclear pores?

Accepted Answer

They are hydrophobic and can diffuse through lipid bilayers

Introduction to Eukaryotic Cell Biology: Structure, Membranes, and Organelle Function

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