Which of the following membrane-crossing mechanisms requires energy?
A. Active transport
B. Facilitated diffusion
C. Simple diffusion
D. Passive transport
E. Turgor
Answer: A
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________ are activities of a chemotherapeutic agent that damage the host either by inhibiting the same process in the host as in the target cell or by damaging other processes.
Fill in the blank(s) with the appropriate word(s).
Isomers are defined as:
A. molecules with the same number of carbon atoms but potentially different numbers of other atoms. B. molecules with the same chemical formula but different structures. C. atoms with the same number of protons but different numbers of neutrons. D. molecules with the same general three- dimensional structures but different chemical formulas. E. molecules with different chemical formulas but similar biological functions.
Which immune cells are long-lived cells that can respond to a later encounter with the same antigen?
a. helper T cells b. plasma cells c. dendritic cells d. memory cells e. cytotoxic T cells
Two mammals, a sheep and a goat, produce offspring. Only the F1 and F2 generations produce fertile
offspring. This is occurs as result of: a. hybrid breakdown. b. hybrid inviability. c. hybrid sterility. d. macroevolution. e. microevolution.