$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i + \text{energy}$$

$$\text{Protein} + \text{Oligosaccharide} \xrightarrow{\text{Dolichol}} \text{Glycoprotein}$$

Question 1

Which organelle is primarily responsible for ATP synthesis via oxidative phosphorylation in eukaryotic cells?

Accepted Answer

Mitochondria

Question 2

A mutation prevents the formation of vesicles from the Golgi apparatus. Which cellular process would be most directly affected?

Accepted Answer

Modification and sorting of proteins/lipids

Question 3

Which of the following is NOT a membrane-bound organelle?

Accepted Answer

Microtubule

Question 4

The endosymbiont theory explains the origin of which two organelles?

Accepted Answer

Mitochondria and chloroplasts

Question 5

Which cellular component is responsible for ribosome biogenesis?

Accepted Answer

Nucleolus

Question 6

A protein destined for secretion is synthesized in the cytosol. What must occur for it to enter the endoplasmic reticulum?

Accepted Answer

It must contain an ER signal sequence recognized by the signal recognition particle (SRP).

Question 7

Which of the following equations correctly represents the hydrolysis of ATP to ADP and inorganic phosphate?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy}$$

Question 8

Which process involves the movement of proteins through the nuclear pore using energy from GTP?

Accepted Answer

Nuclear localization signal recognition

Question 9

What is the primary function of the lysosome in eukaryotic cells?

Accepted Answer

Intracellular degradation

Question 10

During vesicular transport, what is the fate of a protein that leaves the ER and fuses with the plasma membrane?

Accepted Answer

It is secreted outside the cell.

Question 11

Which of the following best describes the function of the cytoskeleton?

Accepted Answer

Provides structural support and facilitates movement

Question 12

A cell is unable to degrade misfolded proteins in the ER. Which response is most likely impaired?

Accepted Answer

Unfolded protein response

Question 13

Which molecule acts as a precursor for N-linked glycosylation in the ER?

Accepted Answer

Dolichol

Question 14

What is the role of the signal peptidase during ER import?

Accepted Answer

Cleaves the ER signal sequence off once the protein is inside the ER

Question 15

Which of the following is a multi-step process that involves both the cytoskeleton and motor proteins?

Accepted Answer

Movement of organelles within the cell

Question 16

Which equation best represents the process of glycosylation in the ER?

Accepted Answer

$$	ext{Protein} + 	ext{Oligosaccharide} \xrightarrow{	ext{Dolichol}} 	ext{Glycoprotein}$$

Question 17

A protein contains both start and stop transfer sequences. What type of protein is this most likely to be?

Accepted Answer

Multi-pass transmembrane protein

Question 18

Which organelle is the microtubule organizing center in eukaryotic cells?

Accepted Answer

Centrosome

Question 19

Which of the following best describes the function of peroxisomes?

Accepted Answer

Oxidation of toxic molecules

Question 20

A scientist observes that a protein is retained within the ER and not exported. Which signal is most likely responsible for this retention?

Accepted Answer

ER-retention signal located on the C-terminus

Eukaryotic Cell Structure and Protein Transport Mechanisms

Study Guide - Practice Questions