What is an example of a +/+ interaction?
A. parasitism
B. ammensalism
C. competition
D. mutualism
E. commensalism
Answer: D
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When an enveloped virus adsorbs to the host cell with its protein spikes, the virions are taken into the cell by the process of
A. penetration. B. production. C. fusion. D. endocytosis.
Which cells are held in reserve to be used for a rapid response to subsequent intruders of the same type?
a. NK cells b. helper T cells c. cytotoxic T cells d. memory cells e. B cells
In an atom, ____ spin around the nucleus
a. electrons b. protons c. neutrons d. both neutrons and protons e. both protons and electrons
What type of reactions take place in the portion of the sulfur cycle indicated in the figure above?
A. oxidation-reduction B. fermentation C. dissimilation D. denitrification E. carbon fixation