A piece of DNA that is self-replicating and is used to carry desired genes into new cells is called a(n)

a. library.
b. clone.
c. vector.
d. intron


Ans: c. vector.

Biology & Microbiology

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The activated sludge process

A. is used during secondary treatment of sewage. B. is meant to convert inorganic to organic matter. C. is meant to increase the BOD. D. removes large objects from the sewage. E. is meant to convert inorganic to organic matter AND is meant to increase the BOD.

Biology & Microbiology

At the height of the action potential,

a. the interstitial fluid is more negatively charged than the cytoplasmic fluid. b. the interstitial fluid is less negatively charged than the cytoplasmic fluid. c. the interstitial fluid and the cytoplasmic fluid have the same charge. d. all sodium and potassium ions rush out of the neuron. e. both a and d occur

Biology & Microbiology

Cancerous growths appear to grow faster than the tissues around them because ____

a. their mitosis rates are higher b. they do not stop dividing even when crowding occurs c. the cancer cells inhibit the reproduction of the surrounding normal cells d. their mitosis rates are higher, and they do not stop dividing even when crowding occurs e. the cells in the tissues around them stop dividing

Biology & Microbiology

Which of the following drugs inhibits nucleic acid synthesis specifically in most bacteria?

A. fluoroquinolones B. actinomycin C. rifampin D. tetracycline E. 5-fluorocytosine

Biology & Microbiology