Q: Which of the following equations best represents the process of protein synthesis at the ribosome?

$$\text{mRNA} + \text{tRNA} + \text{ribosome} \rightarrow \text{polypeptide}$$

Question 1

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

Accepted Answer

It coordinates the synthesis, modification, and transport of proteins and lipids within the cell.

Question 2

A protein destined for secretion from a eukaryotic cell is synthesized by which of the following structures?

Accepted Answer

Bound ribosomes on the rough endoplasmic reticulum

Question 3

Which organelle is primarily responsible for adding final modifications, such as phosphate groups, to proteins before they are sent to their destination?

Accepted Answer

Golgi apparatus

Question 4

What is the main role of lysosomes in animal cells?

Accepted Answer

They break down old cell parts and engulfed materials using hydrolytic enzymes.

Question 5

Which of the following equations best represents the process of protein synthesis at the ribosome?

Accepted Answer

$$	ext{mRNA} + 	ext{tRNA} + 	ext{ribosome} ightarrow 	ext{polypeptide}$$

Question 6

A plant cell is observed to wilt. Which organelle is most directly involved in this process, and why?

Accepted Answer

Central vacuole; loss of water reduces turgor pressure against the cell wall.

Question 7

Which of the following best explains the difference between free ribosomes and membrane-bound ribosomes?

Accepted Answer

Free ribosomes synthesize proteins for use within the cytosol, while membrane-bound ribosomes synthesize proteins for secretion or for membranes.

Question 8

During protein trafficking, which sequence of organelles is correct for a secretory protein?

Accepted Answer

Rough ER $$\rightarrow$$ Golgi apparatus $$\rightarrow$$ vesicle $$\rightarrow$$ plasma membrane

Question 9

Which organelle is responsible for detoxification of drugs and poisons in liver cells?

Accepted Answer

Smooth endoplasmic reticulum

Question 10

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

Accepted Answer

Exocytosis

Question 11

Which of the following is a function of peroxisomes in plant seeds during germination?

Accepted Answer

Breakdown of fats to provide energy for the sprouting seed

Question 12

In unicellular eukaryotes such as Paramecium, which organelle helps regulate water balance and prevents cell lysis?

Accepted Answer

Contractile vacuole

Question 13

Which process is most directly associated with the fusion of vesicles with the plasma membrane to release their contents outside the cell?

Accepted Answer

Exocytosis

Question 14

Which of the following best describes the role of the nucleus in the endomembrane system?

Accepted Answer

It stores DNA and directs the synthesis of RNA for protein production.

Question 15

A cell is observed to have an abundance of smooth ER. Which function is this cell most likely specialized for?

Accepted Answer

Detoxification of harmful substances

Question 16

Which of the following is a correct statement about the formation of peroxisomes?

Accepted Answer

They are formed by the fusion of vesicles from mitochondria and the rough ER.

Question 17

Which equation best represents the process of transcription in the nucleus?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{mRNA}$$

Question 18

Which organelle is most likely to be abundant in white blood cells that destroy bacteria by engulfing and digesting them?

Accepted Answer

Lysosome

Question 19

A mutation in the Golgi apparatus prevents the addition of phosphate groups to proteins. What is the most likely consequence?

Accepted Answer

Proteins may not be properly sorted and sent to their correct destinations.

Question 20

Which of the following best explains why plant cells do not have lysosomes but animal cells do?

Accepted Answer

Plant cells use vacuoles for storage and breakdown, while animal cells rely on lysosomes for digestion of cellular waste.

The Endomembrane System in Eukaryotic Cells

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