A one-way relationship in which one species benefits at the expense of another is ____

a. commensalism
b. competitive exclusion
c. parasitism
d. obligate mutualism
e. a neutral relationship


ANSWER: c

Biology & Microbiology

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Mutation differs from other sources of genetic variation because it

A) always harms the phenotype. B) is unpredictable. C) only affects some populations. D) introduces a change, rather than acting upon existing alleles.

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Entry of mineral ions into the xylem is regulated by cells of the cortex.

Answer the following statement true (T) or false (F)

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________ isolating mechanisms lead to reproductive isolation by preventing the formation of hybrid zygotes.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Looking into your microscope, you spot an unusual cell. Instead of the typical rounded cell shape, the cell has a very narrow middle separating two bulging ends. It sort of looks like the number 8! You realize that this cell is

A) undergoing cytokinesis. B) in the S phase of interphase. C) in the G1 phase of interphase. D) about to undergo mitosis.

Biology & Microbiology