A U.S. submarine surfaced __________ miles from
the nearest land in the artic and found polar bears
hunting on the frozen sea.
a. 100
b. 1,000
c. 500
d. 50,000
e. none of these
Answer: c
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In a tetanus shot, patients are injected with small amounts of tetanospasmin, a toxin produced by the Clostridium tetani, the bacterium that causes tetanus. The gene for this protein is carried on a plasmid in the bacterium. Which of the following is true of this gene?
a. It is part of the Clostridium tetani chromosome b. It cannot go through horizontal gene transfer c. It can enter another bacterium by transformation d. It cannot go through vertical gene transfer e. It is found in the nucleus of the Clostridium tetani
In humans, the fluid immediately surrounding the embryo is enclosed by the
a. allantois. b. placenta. c. chorion. d. amnion. e. yolk sac.
Only bacteria cells have cell wall
a. true b. false
You step on something in the yard resulting in a puncture wound that does not bleed freely. Antigens from any microbes that entered the wound will most likely end up in the
A) appendix. B) lymph nodes of the groin. C) lymph nodes of the neck (cervical). D) lymph nodes of the armpit (axilla). E) spleen.