If a microbiologist wanted to check for motility of bacteria, he would choose a medium that was

A) liquid.
B) semi-solid.
C) solid.
D) coagulated


Ans: B) semi-solid.

Biology & Microbiology

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Which characteristics best describe earthworms?

a. polychaete; fluid filled coelom b. oligochaete; open circulatory system c. moves by only longitudinal muscle contraction and hydrostatic skeleton d. oligochaete; scavengers; closed circulatory system e. hermaphrodites that fertilize themselves; closed circulatory system

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Which term describes the chemical signaling that allows bacteria in biofilms to communicate

a. regulated cytokinesis b. quorum sensing c. sensitive chemotaxis d. molecular cascade

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Which of these is most likely to cause the development of a six-legged frog?

A) mutation of homeotic genes B) binding of repressors to operons C) a mutation in DNA polymerase that affects all cells D) conversion of a proto-oncogene to an oncogene

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Which of the following proteins are part of the first line of defense against microbial invasion?

A) dermacidins B) TLRs C) NOD proteins D) C3 and C5 E) interferons

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