B) It requires energy
D) It involves the help of carrier proteins.
When the continents are at the Earths poles, they receive less sunlight.
Answer:
Option (1).
Explanation:
Biological membrane mainly composed of lipids and proteins with the small amount of carbohydrate exposed on the outer surface of the membrane. This membrane plays an important role as it separates the cellular environment and facilitate the transport of the selected molecule.
The flippase enzyme is required to transport the molecules from one side of the membrane to the other membrane. Lipids and proteins can undergo lateral motion but at the different rate within the membrane.
Thus, the correct answer is option (1).
Answer:
A.
Explanation:
All other options are simply situational, while cold periods are usually seasonal.
