For growth, most bacteria require water activity levels above

A. 1.00.
B. 0.80.
C. 0.70.
D. 0.90.


D. 0.90.

Biology & Microbiology

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Recent theories on the biological need for IgE as an:

A. Apoptosis causing agent B. Antiviral agent C. Antibacterial agent D. Antifungal agent E. Anti-helminthic

Biology & Microbiology

Red-green color blindness is an X-linked recessive trait in humans. A color-blind woman and a man with normal vision have a son. What is the probability that the son is color blind?

A) 75 percent B) 50 percent C) 25 percent D) 0 percent E) 100 percent

Biology & Microbiology

The situation in which an active regulatory protein "turns off" gene expression is an example of

A) a mutation. B) positive control. C) negative control. D) constitutive gene elements. E) unique regulation.

Biology & Microbiology

Which receptor type makes you aware that your appendix is inflamed?

a. mechanoreceptors b. photoreceptors

c. chemoreceptors d. thermoreceptors e. nociceptors

Biology & Microbiology