Of these three items - concentration gradient,energy,membrane proteins - which two are needed for active transport to take place?
A) only a concentration gradient
B) all three are needed for active transport to take place
C) a concentration gradient and energy
D) a concentration gradient and membrane proteins
E) energy and membrane proteins
Correct Answer:
Verified
Q2: If the proptoplast of plant cell A
Q3: Which of the following statements is correct?
A)The
Q4: When a plant cell is placed in
Q5: The free movement of water across a
Q6: A plant plasma membrane is made up
Q7: Movement of materials from one plant cell
Q8: The biological term,"cell" came about through the
Q9: _ is(are)necessary for diffusion to take place.
A)A
Q10: Which of the following is not a
Q11: Which of the following is found only
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