Which cells release antibodies into the plasma?
a. T helper cells
b. plasma cells
c. cytotoxic T cells
d. B cells
e. antigen presenting cells
ANSWER: b
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The most common etiologic agents in acute otitis media in children include:
a. Klebsiella pneumococci. b. H. influenzae. c. Streptococcus agalactiae. d. M. catarrhalis.
Simple, single-celled organisms that lack a nucleus are referred to as which of the following?
a. bacteria b. fungi c. prokaryote d. eukaryote
Why is insulin produced by genetically engineered E. coli cells superior to insulin obtained from
animal sources? a. Animal insulin has a shorter life span than insulin produced using recombinant DNA techniques. b. It contains human rather than animal sequences, reducing the chances of an allergic response. c. Animal insulin is more difficult to purify than is recombinantly produced insulin. d. Recombinantly produced insulin has a much higher activity level. e. Recombinantly produced insulin is easier to obtain than insulin from animals.
What factor affects the average temperature of a region?
A) the amount of cloud cover that exists B) the amount of light energy per unit area hitting it C) whether there's an El Niño that year D) the amount of precipitation it receives