Which of the following is TRUE of transporters?
a. Simple diffusion and facilitated diffusion both require proteins to move substances across membranes.
b. Facilitated diffusion is the only transport mechanism that can transport substances against a concentration gradient.
c. Water is only transported across membranes by simple diffusion.
d. The only transport mechanism that requires energy is active transport.
Answer: d. The only transport mechanism that requires energy is active transport.
You might also like to view...
The recommended protein intake for an asymptomatic patient infected with HIV/AIDS who weighs 80 kg would be approximately:
a. 48 g/day. b. 64 g/day. c. 96 g/day. d. 160 g/day.
Make the following metric conversion: 5 decimeters =______ decameters
A. 0.5 B. 0.05 C. 50 D. 500
What would you recommend to a person who is too busy to eat enough to maintain a healthy weight? a. Eat one supersized meal per day
b. Plan meals in advance and eat energy-dense appetizers. c. Replace one meal each day with a high fat snack. d. Replace one meal each day with a glass of fruit juice. e. Add an extra session of resistance training to build muscle mass.
Humans need vitamin B-6 for
A. vitamin C synthesis. B. carbohydrate excretion. C. magnesium absorption. D. amino acid metabolism.