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.


C) negative control.

Biology & Microbiology

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Most plants absorb nitrogen in the form of ____

a. NH4+. b. CN. c. N2. d. NH3. e. NO3-.

Biology & Microbiology

The niche of the species is best described as:

a. the biological relationships of the species in the ecosystem. b. the behavior of a species in the ecosystem. c. the sum of the abiotic factors required or tolerated by the species. d. the occupation (needs and role) of the species in the ecosystem. e. the location where the species resides.

Biology & Microbiology

Prozac is used as an antidepressant and acts by inhibiting the reuptake of which neurotransmitter in neuronal synapses?

A) dopamine B) serotonin C) acetylcholine D) glutamate

Biology & Microbiology

Legionella is an opportunistic pathogen that has recently emerged as a public health risk associated with water handling systems. Why?

a. It is resistant to common disinfectants. b. It forms biofilms that make it hard to clear from a system. c. It can reside and replicate in protozoa. d. Both a and b are correct.

Biology & Microbiology