The ________ is the electron donor in a redox reaction.

A. product
B. enzyme
C. reductant
D. oxidant


Answer: C

Biology & Microbiology

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Halobacterium salinarum lives in and requires a high salt concentration.  This is an example of an archaeon described as a ______.

A. halophile B. thermophile C. barophile D. psychrophile

Biology & Microbiology

Since 2008, grizzly bears (Ursus arctos horribilis) have been spotted farther north than their historic range. As a result, grizzly bear habitat now overlaps polar bear (Ursus maritimus) habitat. The two species of bears, which are capable of mating and producing viable offspring, are considered separate “ecological” species because historically they lived in different habitats and never met. However, in 2006 a hunter shot a wild grizzly-polar bear hybrid known as a grolar bear, the first wild hybrid ever found. This overlap is due to which of the following threats to biodiversity?

a. overharvesting b. habitat loss c. global climate change d. introduction of exotic species

Biology & Microbiology

Which organisms undergo alternation between haploid and diploid generations?

a. all plants b. all animals c. all bacteria d. all fungi

Biology & Microbiology

Only humans can be reservoirs of infection

Indicate whether the statement is true or false

Biology & Microbiology