Question

which of the following processes requires a cell to expend energy?
protein pump (active transport)
facilitated diffusion
diffusion
osmosis
question 14
2 pts
the plasma membrane is described as being selectively or semi - permeable, which means:
only certain things can pass through it
nothing can pass through it
everything can pass through it
it has a permanent structure

Explanation:

• For the first question: Active transport (protein pump) requires energy (ATP) as it moves substances against their concentration gradient. Facilitated diffusion, diffusion, and osmosis are passive processes that do not require energy as they move substances down their concentration gradient.
• For the second question: A selectively or semi - permeable membrane means that only certain substances (based on size, charge, solubility etc.) can pass through it. It is not impermeable (nothing can pass) or fully permeable (everything can pass), and it does not have a permanent structure (it is fluid - mosaic).

Answer:

• First question: protein pump (active transport)
• Second question: only certain things can pass through it