What is an example of a +/+ interaction?

A. parasitism
B. ammensalism
C. competition
D. mutualism
E. commensalism


Answer: D

Biology & Microbiology

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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

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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

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In an atom, ____ spin around the nucleus

a. electrons b. protons c. neutrons d. both neutrons and protons e. both protons and electrons

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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

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