Question 1

Which of the following best describes the initial step of protein synthesis in a eukaryotic cell?

Accepted Answer

DNA in the nucleus is transcribed into mRNA.

Question 2

What is the correct sequence of events for the synthesis and processing of a protein destined for secretion from a cell?

Accepted Answer

DNA → mRNA → ribosome → rough ER → vesicle → Golgi apparatus → secretory vesicle

Question 3

If a mutation prevents mRNA from leaving the nucleus, which process would be directly affected?

Accepted Answer

Translation of mRNA into protein

Question 4

Which organelle is primarily responsible for the initial folding and modification of newly synthesized proteins?

Accepted Answer

Rough endoplasmic reticulum (ER)

Question 5

A scientist observes that a cell is unable to package and export proteins. Which organelle is most likely malfunctioning?

Accepted Answer

Golgi apparatus

Question 6

Which of the following best explains why ribosomes are found attached to the rough ER?

Accepted Answer

They translate mRNA into proteins that are destined for secretion or for use in membranes.

Question 7

What would happen if vesicles transporting proteins from the ER to the Golgi apparatus were inhibited?

Accepted Answer

Proteins would accumulate in the ER and not be properly processed or secreted.

Question 8

Which of the following is the correct order of events for the translation of mRNA into a protein?

Accepted Answer

mRNA binds to a ribosome, tRNA brings amino acids, peptide bonds form, protein is released

Question 9

A cell is observed to have an accumulation of incomplete proteins in the cytoplasm. Which step in protein synthesis is most likely defective?

Accepted Answer

Translation of mRNA by ribosomes

Question 10

Which of the following best describes the role of lysosomes in the context of protein synthesis and processing?

Accepted Answer

They degrade and recycle cellular waste, including misfolded or damaged proteins.

Question 11

If a protein is destined to be secreted from the cell, which of the following pathways does it most likely follow?

Accepted Answer

Rough ER → vesicle → Golgi apparatus → secretory vesicle → plasma membrane

Question 12

Which process is directly responsible for converting the genetic code in DNA into a complementary RNA sequence?

Accepted Answer

Transcription

Question 13

A mutation in a cell prevents the formation of vesicles from the ER. What is the most likely consequence?

Accepted Answer

Proteins will not be transported to the Golgi apparatus for further processing.

Question 14

Which of the following best explains why the rough ER is 'rough'?

Accepted Answer

It is covered with ribosomes that are actively synthesizing proteins.

Question 15

Which of the following is NOT a possible fate for a protein after it leaves the Golgi apparatus?

Accepted Answer

Being degraded in the nucleus

Protein Synthesis: From Gene to Protein Packaging

Study Guide - Practice Questions