question_answer 39)

Given below is a table. Fill in the gaps.

Property	Simple Diffusion	Facilitated Transport	Active Transport
Highly selective	No	Yes	-
Uphill transport	-	-	Yes
Requires ATP	-	-	-

Answer:

 

Property	Simple Diffusion	Facilitated Transport	Active Transport
Highly selective	No	Yes	Yes
Uphill transport	No	No	Yes
Requires ATP	No	No	Yes

  Active Transport It uses energy to pump molecules against a concentration gradient. Hence, different proteins in the membrane play a major role in active transport. Carrier protein involved in active transport is very specific in what it carries across themembrane. Facilitated Transport In facilitated transport special proteins help in movement of substances across the membrane without the expenditure of ATP. Facilitated transport is very specific as it allows cell to select substances for uptake. Simple Diffusion It is a physical phenomenon which involves the movement of water fromhigher concentration to lower concentration. It is not a selective process and do not requireenergy.