Insulin is a ligand.

a. true
b. false


Ans: a. true

Biology & Microbiology

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PCR is particularly useful in

A. detecting viable yet non-culturable organisms. B. assessing impure (multiple types of bacteria present) samples. C. dealing with very small numbers of bacteria. D. relatively quickly producing results. E. All of the choices are correct.

Biology & Microbiology

The last two remaining females in this population disperse to join a different population that is

50 km away, where they breed with new males. If these females produce only sterile offspring as the result of mating with males in the new population, what type of reproductive isolation does this represent?

a. post-mating barrier b. pre-mating barrier c. temporal barrier d. behavioral barrier

Biology & Microbiology

What is an example of a molecule that can act as both a neurotransmitter and a hormone?  

A.  estrogen B.  progesterone C.  thyroxine D.  norepinephrine E.  insulin

Biology & Microbiology

What cell cycle regulatory protein is a tumor-suppressor protein?

A. EGF B. E2F C. p53 D. HER2

Biology & Microbiology