The primary function of molecular membranes is the transport of ions and molecules in and out of cells— transport is directional and selective. The moving of molecules from areas of high concentration to those of low concentration to gain energy is best described as:
a. channel-mediated diffusion.
b. active transport.
c. inactivated transport.
d. electron transport.
e. passive transport.
Answer: e. passive transport.
You might also like to view...
Which of the following is NOT a description of sustainability?
a. sustainability means managing resource use today to ensure a vibrant and successful future for others b. sustainability means living in a way that resource use does not exceed the biocapacity of Earth c. the concept of sustainability means different things to different people and can be difficult to define and measure d. sustainability is a concept that only applies to the actions of tree huggers or environmentalists e. sustainability describes the ways humans use Earth's resources
The theory of island biogeography predicts that the extinction rate is greater on large islands than on small islands
Indicate whether the statement is true or false
A species that is so important to its community that its removal can dismantle a food web (such as sea otters) is termed a
A. capstone species. B. flagstone species. C. cobblestone species. D. cornerstone species. E. keystone species.
What are the three glands that produce the liquid portion of semen?
A. seminal vesicles; hypothalamus; bulbourethral B. hypothalamus; prostate; Leydig C. prostate; seminal vesicles; bulbourethral D. seminal vesicle; Leydig; hypothalamus E. Leydig; prostate; bulbourethral