Question

in carrier - mediated transport, one carrier can transport 1000 glucose molecules per ____ across the membrane.
options: minute, second, hour, day

Explanation:

Carrier-mediated membrane transport is a relatively fast process compared to bulk transport, and established biological data shows that a single carrier protein can transport around 1000 glucose molecules across a cell membrane each second. The other time frames (minute, hour, day) are too slow to match the functional rate of these transport proteins.

Answer:

second