transports across cell membrane

Question 1

Which type of membrane transport protein can perform both active and passive transport?

A.channels

B.both channels and transporters

Neither type of membrane transport protein can perform both passive and active transport.

D.transporters

Answer 1

Transporters

Question 2

When glucose moves across the phospholipid bilayer by passive transport, which factor determines the direction of its transport?
a. the charge difference across the membrane
b. the amount of energy available to fuel the transport process
c. whether the cell is metabolically active or not
d. the concentration of glucose on either side of the membrane

Answer 2

d. Glucose, a large, uncharged molecule, moves across the membrane through the action of a glucose transporter, not a pump. Therefore, the direction it moves is determined by its concentration gradient alone.

Question 3

What is true about the NaK pump?

Answer 3

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