The selective permeability of a membrane refers to the ____
a. movement of a molecule from an area of high concentration to an area of low concentration
b. ability of a substance to pass through any membrane
c. ability of only certain molecules to pass across a membrane
d. need for carrier proteins to transport some molecules across a membrane
e. ability of molecules to be transported across a membrane
ANSWER: c
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________ culture techniques are based on the expansion of the microenvironment to allow abundant growth of a microorganism formerly restricted to a small ecological niche.
Fill in the blank(s) with the appropriate word(s).
The loss of ________ that occurs at each trophic level places a limit on how many top-level carnivores a community can support.
A. CO2 B. water C. light D. O2 E. energy
Axonemal dyneins are
A) associated with organelle movement. B) associated with cilia and flagella. C) monomeric myosin-like proteins. D) responsible for axonal anterograde transport. E) All of the above are correct.
A high-affinity receptor does not saturate.
a. true b. false