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.
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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
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
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
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