Question 1

Which of the following best describes the main structural difference between bacterial/eukaryotic and archaeal cell membranes?

Accepted Answer

Bacterial/eukaryotic membranes use ester linkages, while archaeal membranes use ether linkages.

Question 2

Which molecule is most likely to freely diffuse across a biological membrane without the aid of a protein?

Accepted Answer

O2

Question 3

A cell is placed in a solution with a higher solute concentration than its cytoplasm. What will most likely happen to the cell?

Accepted Answer

The cell will shrivel due to water loss.

Question 4

Which of the following statements about the fluid mosaic model of biological membranes is correct?

Accepted Answer

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

Question 5

Which of the following processes requires energy input from ATP hydrolysis?

Accepted Answer

Primary active transport

Question 6

What is the main function of cholesterol in eukaryotic cell membranes?

Accepted Answer

To increase membrane fluidity at high temperatures and rigidity at low temperatures

Question 7

Which type of membrane protein is covalently attached to lipid molecules within the bilayer?

Accepted Answer

Lipid-anchored proteins

Question 8

A transport protein that moves two different molecules in opposite directions across a membrane is called a:

Accepted Answer

Antiporter

Question 9

Which of the following best describes osmosis?

Accepted Answer

Movement of water molecules across a semi-permeable membrane into a region of high solute concentration

Question 10

Which of the following is a function of membrane-associated proteins?

Accepted Answer

All of the above

Question 11

Which of the following statements about facilitated diffusion is TRUE?

Accepted Answer

It requires a protein transporter.

Question 12

Which of the following transport mechanisms modifies a chemical as it is transported into the cell?

Accepted Answer

Group translocation

Question 13

Which of the following is TRUE about secondary active transport?

Accepted Answer

It uses the concentration gradient established by primary active transport.

Question 14

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 15

Which of the following best describes the sodium-potassium pump?

Accepted Answer

Transports 3 sodium ions out of a cell and 2 potassium ions into a cell using energy from ATP hydrolysis.

Question 16

Which of the following processes includes all of the others?

Accepted Answer

Passive transport

Question 17

Which of the following statements is FALSE regarding archaeal cell membranes?

Accepted Answer

The glycerophosphate head & fatty acid tail of archaeal membranes are linked by an ester linkage.

Question 18

Which of the following best describes a transporter that requires ATP to move molecules A and B out of the cell?

Accepted Answer

An active antiporter

Question 19

Which of the following is a characteristic of thermophilic archaea membrane lipids?

Accepted Answer

They form monolayer membranes.

Question 20

Which of the following processes requires a carrier protein?

Accepted Answer

Both facilitated diffusion and active transport

Cell Membrane & Transport: Structure, Function, and Mechanisms

Guida di studio - Domande di pratica