A) membrane receptors
B) carrier proteins
C) integral proteins
D) none of these.
Correct Answer: B
Solution :
: Carrier proteins help to transport substances across the membrane against concentration gradients, e.g., permeases. Any substance which is to be transported against concentration gradient must be first of all combine with the carrier to form carrier-transport complex. This complex goes across the membrane and sets free the transportant. There may or may not be expenditure of energy
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