Question

Gases such as Oxygen and carbon dioxide cross the cell membrane by.
(a) passive diffusion through the lipid bilayer
(b) primary active transport
(c) specific gas transport protein
(d) secondary active transport
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Answer 1

Explanation:

the answer is:-

question:- where does the gases pass by in cells?

answer:- passive deffusion through the lipid layer.

Reason:-

Passive deffusion is a path in a cell membrane which only gives a little space for the gas of in and out to pass and enter.

hope it helps you......

Answer 2

Gases such as Oxygen and carbon dioxide cross the cell membrane by.

(a) passive diffusion through the lipid bilayer.

Passive diffusion is a mode of membrane transport :

• which does not require any energy to move substances across cell membrane or, from higher concentration gradient to lower concentration gradient.
• they do not require energy pumps.

The cell membrane is selectively permeable. Gases such as Oxygen and carbon dioxide cross the cell membrane by  

(a) passive diffusion through the lipid bilayer

as they do not require any :

1. Expenditure of energy
2. Pump.