Transporting a substance against its concentration gradient requires
A. a transporter that is facilitated in its diffusion.
B. countertransport with another molecule against its concentration gradient.
C. cotransport with another molecule against its concentration gradient.
D. a transporter that uses energy.
E. a channel that is specific for that substance.
Answer: D. a transporter that uses energy.
You might also like to view...
what is the first step in the physiology of endotoxic shock?
What will be an ideal response?
In seed plants, __________ allow reproduction
without standing water. Fill in the blank(s) with the appropriate word(s).
The buildup of genetic differences between isolated populations is
a. gene flow. b. genetic equilibrium. c. divergence. d. adaptation. e. natural selection.
Sponge larvae:A
are miniature sponges that float about in the plankton. B. crawl along the bottom like an amoeba. C. are flagellated and able to swim. D. bud off the adult sponge. E. float out of the adult, fall to the bottom, and attach to form a new sponge.