Poriferans are ____
a. Herbivores
b. filter feeders
c. Scavengers
d. Predators
e. carnivores
ANSWER: b
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Hiv
A. appears to cause AIDS. B. is an RNA virus. C. destroys T helper cells. D. makes the patient vulnerable to infections, especially those caused by opportunists. E. All of the choices are correct.
In recombinant DNA technology, plasmids
A) are used to insert foreign DNA into bacteria. B) are necessary for cellular respiration in certain plants. C) are the sites of protein synthesis in bacteria. D) show restriction enzymes where to cut bacterial DNA. E) are isolated from the blood of mammals.
The normal hosts for St. Louis encephalitis virus are
A) birds. B) small mammals. C) horses. D) humans. E) horses and humans.
Antisera directed against toxins are known as (antibodies/antitoxins/anti-antibodies).
Fill in the blank(s) with the appropriate word(s).