Question 1

Which of the following statements best describes the fluid mosaic model of biological membranes?

Accepted Answer

Membranes consist of protein molecules embedded in a dynamic bilayer of phospholipids.

Question 2

Which chemical is found in eukaryotic cell membranes and regulates membrane fluidity in extreme temperatures?

Accepted Answer

Cholesterol

Question 3

Archaeal membrane lipids differ from bacterial and eukaryotic membrane lipids in which two significant ways?

Accepted Answer

They have isoprene chains and ether linkages.

Question 4

A transport protein that simultaneously transports two different molecules in opposite directions is called:

Accepted Answer

An antiporter

Question 5

Which of the following molecules most easily diffuses across a biological membrane’s lipid bilayer, without the help of a protein?

Accepted Answer

O2

Question 6

Which of the following processes requires a carrier protein?

Accepted Answer

e) b & c

Question 7

Which of the following best describes osmosis?

Accepted Answer

Water molecules move across a semi-permeable membrane into a region of high solute concentration.

Question 8

A microbiologist starts with 100 cells of a bacterium with a generation time of 1 hour. How many cells will there be after 12 hours?

Accepted Answer

$$4,096$$

Question 9

Which of the following is NOT a function of the glycocalyx in bacterial cells?

Accepted Answer

Protein synthesis.

Question 10

Which of the following statements about prokaryotic and eukaryotic cells is correct?

Accepted Answer

a and b

Question 11

Which of the following is NOT a component of the cytoskeleton in eukaryotic cells?

Accepted Answer

Tight junctions

Question 12

Which of the following is the most common pathway taken for a newly synthesized protein to be secreted from a eukaryotic cell?

Accepted Answer

Rough ER → Golgi → Transport vesicle → Cell membrane

Question 13

Which of the following is NOT a true statement regarding exocytosis?

Accepted Answer

It forms intracellular vesicles from inward folding of the plasma membrane.

Question 14

Which of the following is NOT a chemical component of a bacterial cell wall?

Accepted Answer

Cellulose

Question 15

Which part of Lipopolysaccharide (LPS) is responsible for the endotoxin activity during bacterial infections?

Accepted Answer

Lipid-A

Question 16

Which of the following statements about ribosomes is FALSE?

Accepted Answer

Ribosomes synthesize new lipids.

Question 17

Which of the following is a function of pili in bacteria?

Accepted Answer

All of the above

Question 18

Which of the following is a unique feature of archaeal cell membranes compared to bacterial and eukaryotic membranes?

Accepted Answer

Isoprene chains and ether linkages

Question 19

Which of the following processes is highly associated with mitochondria?

Accepted Answer

Cellular respiration

Question 20

Endosymbiotic theory is supported by the discovery of non-nuclear DNA in which organelles?

Accepted Answer

Chloroplast and mitochondria

Functional Anatomy of Prokaryotic and Eukaryotic Cells: Cell Envelope & Biological Membranes

Study Guide - Practice Questions