Q: Which equation best represents the process of translation occurring in the rough endoplasmic reticulum of beta cells?

$$\text{mRNA} + \text{tRNA} + \text{ribosomes} \rightarrow \text{polypeptide (insulin)}$$

Question 1

Beta cells in the pancreas produce and secrete the protein hormone insulin. Which organelles would you expect to be especially abundant in these cells, and why?

Accepted Answer

Golgi apparatus and rough endoplasmic reticulum, because they are involved in the synthesis and processing of secreted proteins such as insulin.

Question 2

A mutation causes the rough endoplasmic reticulum in pancreatic beta cells to malfunction. What is the most likely consequence for insulin production?

Accepted Answer

Insulin will not be properly synthesized, leading to decreased secretion.

Question 3

Which of the following best describes the role of the Golgi apparatus in beta cells during insulin secretion?

Accepted Answer

It packages and modifies insulin for secretion.

Question 4

If a toxin specifically inhibits ribosomes in pancreatic beta cells, which process will be directly affected?

Accepted Answer

Protein synthesis, including insulin production

Question 5

Which equation best represents the process of translation occurring in the rough endoplasmic reticulum of beta cells?

Accepted Answer

$$	ext{mRNA} + 	ext{tRNA} + 	ext{ribosomes} ightarrow 	ext{polypeptide (insulin)}$$

Question 6

A patient with a genetic defect in the Golgi apparatus of beta cells is most likely to experience which of the following?

Accepted Answer

Impaired packaging and secretion of insulin

Question 7

Which organelle is primarily responsible for the initial folding of the insulin polypeptide chain in beta cells?

Accepted Answer

Rough endoplasmic reticulum

Question 8

Why do beta cells require a well-developed rough endoplasmic reticulum?

Accepted Answer

To synthesize and process large amounts of protein hormones like insulin

Question 9

Which of the following best explains why mitochondria are not the most abundant organelle in beta cells?

Accepted Answer

Protein synthesis and secretion require more rough ER and Golgi apparatus than mitochondria.

Question 10

A researcher isolates a cell with abundant rough endoplasmic reticulum and Golgi apparatus. Which function is this cell most likely specialized for?

Accepted Answer

Synthesis and secretion of proteins

Cellular Organelles in Protein-Secreting Cells: Beta Cells and Insulin

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