Q: Facilitated diffusion differs from simple diffusion in that:

Facilitated diffusion requires membrane transport proteins

Q: Which of the following statements about transmembrane proteins is TRUE?

Transmembrane proteins are amphipathic, containing both hydrophobic and hydrophilic regions

Q: Which of the following best explains why phospholipids form bilayers in aqueous environments?

Phospholipids have hydrophilic heads and hydrophobic tails, causing them to arrange with heads facing water and tails facing each other

Q: A cell membrane is described as a 'fluid mosaic.' Which feature of the membrane does this term NOT refer to?

The rigid, immobile structure of the membrane

Q: If a cell needs to increase its surface area rapidly, which process would it most likely use?

Adding new membrane lipids to the plasma membrane

Q: Which of the following statements about osmosis is correct?

Osmosis is the movement of water across a selectively permeable membrane from a region of low solute concentration to high solute concentration

Q: Which of the following would most likely increase the permeability of a membrane to small polar molecules?

Increasing the proportion of unsaturated fatty acids in the membrane

Question 1

Which of the following changes would most likely increase the fluidity of a cell membrane at low temperatures?

Accepted Answer

Increasing the proportion of unsaturated fatty acids in membrane phospholipids

Question 2

A red blood cell is placed in a solution that is hypertonic relative to its cytoplasm. What will happen to the cell?

Accepted Answer

Water will move out of the cell, causing it to shrink

Question 3

Which of the following best describes the role of cholesterol in the plasma membrane?

Accepted Answer

Cholesterol decreases membrane fluidity at high temperatures and increases fluidity at low temperatures

Question 4

Which equation best describes the net movement of molecules during simple diffusion?

Accepted Answer

$\Delta G < 0$

Question 5

A cell regulates the amount of unsaturated fatty acids in its membrane by controlling the activity of which type of enzyme?

Accepted Answer

Desaturase

Question 6

Which of the following molecules would have the lowest permeability across a pure phospholipid bilayer?

Accepted Answer

Na$^+$

Question 7

Facilitated diffusion differs from simple diffusion in that:

Accepted Answer

Facilitated diffusion requires membrane transport proteins

Question 8

Which of the following statements about transmembrane proteins is TRUE?

Accepted Answer

Transmembrane proteins are amphipathic, containing both hydrophobic and hydrophilic regions

Question 9

Which of the following best explains why phospholipids form bilayers in aqueous environments?

Accepted Answer

Phospholipids have hydrophilic heads and hydrophobic tails, causing them to arrange with heads facing water and tails facing each other

Question 10

A cell membrane is described as a 'fluid mosaic.' Which feature of the membrane does this term NOT refer to?

Accepted Answer

The rigid, immobile structure of the membrane

Question 11

Which of the following transport processes requires energy input from the cell?

Accepted Answer

Active transport

Question 12

If a cell needs to increase its surface area rapidly, which process would it most likely use?

Accepted Answer

Adding new membrane lipids to the plasma membrane

Question 13

Which of the following is a function NOT typically associated with membrane proteins?

Accepted Answer

Synthesis of fatty acids

Question 14

Which of the following statements about osmosis is correct?

Accepted Answer

Osmosis is the movement of water across a selectively permeable membrane from a region of low solute concentration to high solute concentration

Question 15

Which of the following would most likely increase the permeability of a membrane to small polar molecules?

Accepted Answer

Increasing the proportion of unsaturated fatty acids in the membrane

Question 16

Peripheral membrane proteins differ from integral membrane proteins in that peripheral proteins:

Accepted Answer

Are attached to the membrane surface via non-covalent interactions

Question 17

Which of the following best describes the movement of phospholipids within the cell membrane?

Accepted Answer

Phospholipids move laterally within the same leaflet of the bilayer

Question 18

Which of the following is TRUE regarding the effect of temperature on membrane fluidity?

Accepted Answer

Membrane fluidity increases as temperature increases

Question 19

A mutation causes a cell to produce only saturated fatty acids in its membrane phospholipids. What is the most likely consequence?

Accepted Answer

The membrane will become less fluid and less permeable

Lipids, Membranes, and Membrane Transport: Structure and Function

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