Question 1

Which of the following best describes the initial role of DNA in protein synthesis?

Accepted Answer

DNA provides the instructions for building proteins by encoding genes.

Question 2

What is the correct sequence of organelles that a complex protein passes through from synthesis to secretion?

Accepted Answer

Nucleus → Endoplasmic Reticulum → Golgi Apparatus → Secretory Vesicle

Question 3

Which organelle is primarily responsible for modifying, sorting, and packaging proteins for secretion?

Accepted Answer

Golgi Apparatus

Question 4

If a mutation prevents proteins from entering the endoplasmic reticulum (ER), which of the following processes would be directly affected?

Accepted Answer

Modification and folding of complex proteins

Question 5

Which of the following best explains why ribosomes are important in protein synthesis?

Accepted Answer

They translate mRNA into amino acid sequences to build proteins.

Question 6

A scientist observes that a cell is unable to produce lysosomes. Which organelle is most likely malfunctioning?

Accepted Answer

Golgi Apparatus

Question 7

Which of the following steps occurs immediately after mRNA leaves the nucleus during protein synthesis?

Accepted Answer

The mRNA is translated by ribosomes in the cytoplasm.

Question 8

A protein destined for secretion is synthesized and then follows which pathway?

Accepted Answer

Ribosome → Endoplasmic Reticulum → Golgi Apparatus → Secretory Vesicle → Plasma Membrane

Question 9

Which of the following best describes the function of the vacuole in the context of protein processing?

Accepted Answer

It stores and sometimes degrades proteins after they have been processed.

Question 10

If a cell's Golgi apparatus is damaged, which of the following is a likely consequence?

Accepted Answer

Proteins will not be properly modified or sorted for their final destinations.

Question 11

Which of the following equations best represents the central dogma of molecular biology?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 12

A mutation in a gene leads to a nonfunctional protein. At which step did the error most likely occur?

Accepted Answer

During transcription of DNA to mRNA

Question 13

Which of the following is NOT a function of the endoplasmic reticulum (ER) in protein synthesis?

Accepted Answer

Degrading proteins into amino acids

Question 14

Which of the following best explains why some proteins are sent to the lysosome after being processed in the Golgi apparatus?

Accepted Answer

They are destined for degradation or for use in cellular digestion.

Question 15

A cell is observed to have an accumulation of proteins in the ER. Which of the following is the most likely explanation?

Accepted Answer

There is a defect in vesicle transport from the ER to the Golgi apparatus.

Protein Synthesis and Processing in Eukaryotic Cells

Study Guide - Practice Questions