Question

post - test
cell membrane and transport: learn how transporters keep cells healthy
one more thing before you go...
lets find out how much you learned about this topic!
this will help us personalize your learning experience, and dont worry, it wont affect your grades.
question 7 of 13
which of the following describes a primary active transport mechanism?
an atp - driven pump that uses energy from atp hydrolysis to move ions against their gradient.
a channel protein that allows ions to flow down their electrochemical gradient.
a carrier protein that transports glucose down its concentration gradient.

Explanation:

Primary active transport uses energy directly from ATP hydrolysis to move substances against their concentration or electrochemical gradient. An ATP - driven pump that uses energy from ATP hydrolysis to move ions against their gradient is a primary active transport mechanism. A channel protein allowing ions to flow down their electrochemical gradient is passive transport (facilitated diffusion). A carrier protein transporting glucose down its concentration gradient is also passive transport (facilitated diffusion).

Answer:

An ATP - driven pump that uses energy from ATP hydrolysis to move ions against their gradient.