Which term describes the concept that no two species can have the same "job" in the community at the same time?

a) competitive exclusion
b) symbiosis
c) habitat
d) mimicry
e) density-dependent factor


Ans: a) competitive exclusion

Biology & Microbiology

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An r-strategist will typically:

A. produce many offspring. B. produce small offspring. C. provide abundant parental care. D. produce many small offspring. E. produce many small offspring and provide abundant parental care.

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A researcher has mapped the entire genome of an insect. When scanning the sequences she notices highly repetitive sequences, which contain tandem arrays of short sequences. She is most likely looking at which region of the chromosome?

A. centromere B. telomere C. chromatid D. spindle fiber E. centriole

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Hyperpolarization of the postsynaptic nerve terminal

A) decreases the chance that an action potential will be initiated. B) increases the chance that an action potential will be initiated. C) does not affect the initiation of an action potential. D) is stimulated by an influx of calcium ions. E) none of the above

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In the study of cultural evolution, what is a "meme"?

A. A unit of cultural inheritance B. A humorous piece of media that is rapidly spread on the internet C. Early attempts at music and art by human ancestors D. Information spread as a disease rather than as inheritance of a gene E. Genetic memory that we have inherited from our ancestors and use without realizing it

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