Cell Transport and Facilitated Diffusion (revised by Sara)

Question 1

Which of the following molecules does NOT require facilitated diffusion to pass through a membrane?

Accepted Answer

ethanol

Question 2

All channel proteins are gated and require a signal from the body to open or close.

Accepted Answer

False

Question 3

What part of a cell's plasma membrane would slow or block the entry of charged/polar molecules?

Accepted Answer

hydrophobic tails

Question 4

Which type of channel protein allows water to cross the membrane very quickly?

Accepted Answer

aquaporins

Question 5

Which type of transport proteins span the membrane & make a hydrophillic tunnel for molecules?

Accepted Answer

channel proteins

Question 6

Why are channel proteins able to move molecules across the plasma membrane at a faster rate?

Accepted Answer

they do not need to change shape and reset

Question 7

In general, which type of transport protein moves molecules more quickly across the membrane?

Accepted Answer

channel proteins

Question 8

Transport proteins shield polar molecules from the hydrophobic core of a plasma membrane.

Accepted Answer

True

Question 9

Which type of transport protein can change shape to move target molecules through the membrane?

Accepted Answer

carrier proteins

Question 10

In this type of diffusion, molecules diffuse with the assistance of membrane proteins:

Accepted Answer

facilitated diffusion

Question 11

What is known as the difference in a substance’s concentration between two regions of space?

Accepted Answer

concentration gradient

Question 12

Channel & carrier proteins are typically selective for only 1 to a few types of molecules.

Accepted Answer

True

Questions 12