Which of the following statements is true for all types of passive transport?
A) Proteins are needed to transport molecules across the membrane.
B) The concentration gradient is the driving force.
C) Only small polar molecules are able to cross the plasma membrane.
D) Ions never cross the plasma membrane by passive transport.
Answer: B
You might also like to view...
The Saguaro cactus is a large cactus found in some southwestern desert environments. It plays
a central role in providing habitat for a variety of other species, and if these cacti die or are removed from the ecosystem, biodiversity declines. Thus, the Saguaro cactus is a __________.
a. keystone species b. tertiary consumer c. generalist d. trophic level
This mammal has forward facing eyes, can
rotate its front limbs 360 degrees, nails instead of claws, and hair. This animal is
a. an orangutan. b. a rat. c. a lemur. d. a bird. e. more than one of these
Summarize the process of DNA replication and outline the difference between how each strand replicates. What will be an ideal response?
An infectious protein is a
A. virus. B. viroid. C. prion. D. virion. E. prophage.