The interaction between two species in which both species may be harmed is known as ____

a. parasitism
b. mutualism
c. competition
d. predation
e. commensalism


ANSWER: c

Biology & Microbiology

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Which of the following was observed by Erwin Chargaff?

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Allergy is a(n) ____ response to ____ antigens

a. overactive; environmental b. underactive; environmental c. overactive; cellular d. underactive; cellular e. normal level; microbial

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Suppose that crossing-over during meiosis occurs within a region where one of the homologous chromosomes has an inversion with respect to the other homolog. Which chromosomal alterations would you expect to find in the gametes produced by this organism?

a. balanced translocations b. translocations c. both duplications and deletions

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In a human zygote, where did most of the cytoplasm come from?

A) spermatogonia B) oocyte C) polar bodies D) sperm

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