Q: Which of the following equations best represents the overall process of protein synthesis and export in a eukaryotic cell?

$$\mathrm{DNA} \xrightarrow{\text{transcription}} \mathrm{mRNA} \xrightarrow{\text{translation}} \mathrm{Protein} \xrightarrow{\text{modification}} \mathrm{Glycoprotein} \xrightarrow{\text{secretion}} \text{Extracellular space}$$

Question 1

Which of the following is NOT considered a component of the endomembrane system in eukaryotic cells?

Accepted Answer

Mitochondria

Question 2

A protein destined for secretion from a pancreatic cell follows which correct sequence of organelles?

Accepted Answer

Nucleus → Rough ER → Transport vesicle → Golgi apparatus → Secretory vesicle → Plasma membrane

Question 3

Which process is responsible for the export of large molecules, such as proteins, from the cell?

Accepted Answer

Exocytosis

Question 4

During glycoprotein synthesis, which organelle is primarily responsible for adding carbohydrate chains to the polypeptide?

Accepted Answer

Rough endoplasmic reticulum

Question 5

What is the main function of the Golgi apparatus in the endomembrane system?

Accepted Answer

Modifies, sorts, and ships cell products

Question 6

Which type of vesicle is involved in the digestion of cellular waste and foreign material?

Accepted Answer

Lysosome

Question 7

A cell is observed to engulf a bacterium by extending its membrane around the particle, forming a food vacuole. Which process is this?

Accepted Answer

Phagocytosis

Question 8

Which statement best describes receptor-mediated endocytosis?

Accepted Answer

It is a highly specific process where extracellular molecules bind to cell surface receptors before being internalized.

Question 9

Which equation best represents the process of transcription in protein synthesis?

Accepted Answer

$$\mathrm{DNA} \rightarrow \mathrm{mRNA}$$

Question 10

Which of the following best explains why eukaryotic cells need an endomembrane system?

Accepted Answer

To compartmentalize cellular functions, allowing different environments for synthesis, breakdown, and storage

Question 11

A mutation prevents vesicles from fusing with the plasma membrane. Which cellular process would be most directly affected?

Accepted Answer

Exocytosis

Question 12

Which organelle receives transport vesicles from the ER and further modifies their contents?

Accepted Answer

Golgi apparatus

Question 13

Which process is unspecific to the substances being transported and involves the cell 'gulping' extracellular fluid?

Accepted Answer

Pinocytosis

Question 14

During exocytosis, what is the initial event that allows the vesicle to fuse with the plasma membrane?

Accepted Answer

Binding of a membrane protein on the vesicle to a membrane protein on the target site

Question 15

Which of the following is TRUE about the biosynthetic secretory pathway?

Accepted Answer

It involves the movement of proteins from the ER to the Golgi and then to the plasma membrane for secretion

Question 16

Which of the following best describes the role of molecular identification tags (such as phosphate groups) added in the Golgi apparatus?

Accepted Answer

They help sort molecules into different batches for different destinations

Question 17

A cell is unable to produce coat proteins for receptor-mediated endocytosis. What is the most likely consequence?

Accepted Answer

The cell will have difficulty forming coated pits and internalizing specific molecules

Question 18

Which of the following equations best represents the overall process of protein synthesis and export in a eukaryotic cell?

Accepted Answer

$$\mathrm{DNA} \xrightarrow{	ext{transcription}} \mathrm{mRNA} \xrightarrow{	ext{translation}} \mathrm{Protein} \xrightarrow{	ext{modification}} \mathrm{Glycoprotein} \xrightarrow{	ext{secretion}} 	ext{Extracellular space}$$

Question 19

Which of the following statements about vesicles is CORRECT?

Accepted Answer

Vesicles can fuse with organelles or the plasma membrane to release their contents

13-The Endomembrane System: Structure, Function, and Protein Transport

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