1. To move molecules from a low concentration on one side of a membrane to a hig
ID: 12956 • Letter: 1
Question
1. To move molecules from a low concentration on one side of a membrane to a high concentration on the other side of a membrane, which would be needed?
A.
Time
B.
A protein that can engage in facilitated diffusion
C.
An active (energy-requiring) process that moves the molecules directly rather than relying on diffusion
Answer choice c
2. If a cell transports a number of these ions across the membrane, which direction of transport would require energy from the cell?
A.
From the outside to the inside of the cell
B.
From the inside to the outside of the cell
Answer choice A
3. Which of the following is not true of the carrier molecules involved in
facilitated diffusion?
A.
They do not require energy to operate.
B.
They can concentrate molecules on one side of the membrane.
C.
They allow molecules to travel both directions across a membrane.
D.
They may undergo a structural (conformational) change upon binding a molecule.
Answer choice D
Explanation / Answer
1. To move molecules from a low concentration on one side of a membrane to a high concentration on the other side of a membrane, which would be needed?
A.Time
B.A protein that can engage in facilitated diffusion
C.An active (energy-requiring) process that moves the molecules directly rather than relying on diffusion
Answer choice c
ACTIVE TRANSPORT
2. If a cell transports a number of these ions across the membrane, which direction of transport would require energy from the cell?
A.From the outside to the inside of the cell
B.From the inside to the outside of the cell
Answer choice A
YOUR ANSWER IS WRONG
3. Which of the following is not true of the carrier molecules involved in
facilitated diffusion?
A.They do not require energy to operate.
B.They can concentrate molecules on one side of the membrane.
C.They allow molecules to travel both directions across a membrane.
D.
They may undergo a structural (conformational) change upon binding a molecule.
Answer choice D YOUR ANSWER IS WRONG
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