The bacterium that causes botulism disease is harmless until it:
a. is infected by prions.
b. is infected by lytic bacteria.
c. is irradiated by UV radiation.
d. contains a certain prophage DNA.
e. is infected by certain retroviruses.
d
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Which of the following is true about bacteria?
a. most bacteria are harmful b. bacteria only inhabit surfaces c. we have more bacteria cells that our own cells d. bacteria are restricted in their distribution to certain ecosystems e. bacteria are the most common organisms in the Domain Eukarya
The body’s inner surfaces are protected against penetration by harmful microorganisms by ____
a. water permeable outer skin layers b. watery mucus c. high pH of gastric and vaginal environments d. cilia e. warm, moist environments
A novel, derived character is also referred to as a(n) ________
A) apomorphy B) plesiomorphy C) synapomorphy D) clade
The study of how organisms interact with one another and with their nonliving environment is
A) ecology. B) morphology. C) anatomy. D) ecosystems. E) genetics.