Question

What type of transport does not require energy to move molecules across the plasma membrane?

a) concentration gradient

b) passive

c) active

d) bilayer

Answer 1

Passive transport doesn't require energy to facilitate transportation of molecules across the plasma membrane. For instance, Diffusion is a mode of passive transport that doesn't involve energy changes. Although, diffusion is limited to gases.

• Active Transport involves the expenditure of energy. Conduction of amino acids. potassium ions, sodium ions and glucose is through active transport.

• Concentration Gradient (Difference in turgor pressures) affects osmosis; conduction of water. Water always flow from hypotonic gradient to hypertonic gradient.

• Transfer of substances across the phospholipid bilayer is achieved by specialized proteins, commonly called as Facilitated Diffusion.

Option (b) is correct.

Answer 2

Answer:

B: Passive

Explanation: