Question 1

Which of the following organelles is NOT considered part of the endomembrane system in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 2

What is the primary function of ribosomes in the cell?

Accepted Answer

Protein synthesis (translation)

Question 3

Which statement best describes the difference between prokaryotic and eukaryotic ribosomes?

Accepted Answer

Prokaryotic ribosomes have a 70S sedimentation rate, while eukaryotic ribosomes have an 80S sedimentation rate

Question 4

During translation, which cellular structure is responsible for assembling polypeptide chains from mRNA templates?

Accepted Answer

Ribosome

Question 5

Which of the following best describes the role of the Golgi complex in the endomembrane system?

Accepted Answer

It modifies, sorts, and packages proteins for secretion or delivery to other organelles

Question 6

A mutation causes the large subunit of the eukaryotic ribosome to be nonfunctional. Which process would be directly affected?

Accepted Answer

Translation

Question 7

Which equation correctly represents the sedimentation rates of eukaryotic ribosomal subunits?

Accepted Answer

$60S + 40S = 80S$

Question 8

Which organelle is primarily responsible for the breakdown of cellular waste and macromolecules?

Accepted Answer

Lysosome

Question 9

If a cell's endoplasmic reticulum is damaged, which process would be most directly impaired?

Accepted Answer

Modification and transport of proteins and lipids

Question 10

Which of the following statements about ribosomes is TRUE?

Accepted Answer

Ribosomes are non-membrane bound organelles found in both prokaryotic and eukaryotic cells

Question 11

A scientist isolates ribosomes from a bacterial cell and measures their sedimentation rate. What value should they expect?

Accepted Answer

$70S$

Question 12

Which process occurs in the cytoplasm and involves ribosomes reading mRNA to synthesize proteins?

Accepted Answer

Translation

Question 13

Which of the following is a correct sequence of protein movement through the endomembrane system?

Accepted Answer

Endoplasmic reticulum → Golgi complex → Lysosome

Question 14

Which of the following best explains why ribosomes are classified as non-membrane bound organelles?

Accepted Answer

They are composed of proteins and rRNA without a surrounding membrane

Question 15

A cell is observed to have many ribosomes attached to its endoplasmic reticulum. What is the most likely function of this cell?

Accepted Answer

Secretion of large amounts of protein

Question 16

Which of the following is NOT a function of the endomembrane system?

Accepted Answer

Energy production via ATP synthesis

Question 17

Which organelle is directly involved in the synthesis of membrane-bound and secretory proteins?

Accepted Answer

Rough endoplasmic reticulum

Question 18

Which of the following best describes the relationship between the nucleus and the endoplasmic reticulum in eukaryotic cells?

Accepted Answer

The nucleus is physically connected to the endoplasmic reticulum

Question 19

Which of the following would most likely result from a defect in the Golgi complex?

Accepted Answer

Impaired modification and sorting of proteins

Question 20

Which of the following is TRUE regarding the location of ribosomes in eukaryotic cells?

Accepted Answer

Ribosomes can be found both free in the cytoplasm and attached to the endoplasmic reticulum

Endomembrane System and Ribosomes in Eukaryotic Cells

Study Guide - Practice Questions