Which of the following is true of active transport mechanisms?
A) They are exclusively responsible for the movement of nutrients into and out of the enterocytes.
B) They facilitate the processes of osmosis and simple diffusion.
C) They require energy to move substances across cell membranes.
D) They allow nutrients to move from a region of higher concentration to a region of lower concentration.
C
You might also like to view...
Explain the differences between trabecular bone and cortical bone.
What will be an ideal response?
A common drug for the treatment of tuberculosis is known to markedly interfere in the metabolism of vitamin
a. B2. b. B6. c. B12. d. C. e. D.
In 2010, it was estimated that approximately _____ of U.S. adults participate in no leisure-time physical activity.
A. 65% B. 50% C. 40% D. 33% E. 25%
Between amino acids, the ________ bonding causes the straight chain to fold, twist, and coil
A) carbon B) hydrogen C) nitrogen D) oxygen