Grass, mice, snakes, and hawks living together in the same geographic area constitute a/an 

A. ecosystem.
B. abiotic factor.
C. community.
D. environment.


C. community.

Biology & Microbiology

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Microbial strains that can grow on minimal medium are called ________.

A. minitrophs B. prototrophs C. auxotrophs D. autotrophs

Biology & Microbiology

After cell division, each daughter cell has

A) a lower surface area/volume ratio than the parent cell. B) a higher surface area/volume ratio than the parent cell. C) more DNA in its nucleus than the parent cell. D) less DNA in its nucleus than the parent cell.

Biology & Microbiology

The expression of a given gene may be influenced by

a) Activating transcription factors b) Enhancer sequences c) Histone modifications d) All of the above

Biology & Microbiology

The gas exchange surfaces in a mammalian lung are organized into structures that look like clusters of hollow grapes. The hollow, grape-like structures are the________.

A. alveoli B. lamellae C. parabronchi D. bronchi E. opercula

Biology & Microbiology