The lymphocytes that are involved in nonspecifically killing altered self-cells, such as tumor cells and virus infected
cells, are the:a.
monocytes
b. natural killer cells
c. neutrophils
d. B cells
e. eosinophils
b
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An enzyme may lose its ability to function because of
(a) excessively high temperatures. (b) a change in its three-dimensional structure. (c) a large change in the pH of the environment. (d) all of the above.
Which of the following would not be found in a vial containing DNA?
a. nucleotides b. phosphate c. adenine d. uracil
Compounds with carbonyl groups are known as
A. aldehydes or ketones B. ketones or hydrocarbons C. aldehydes or hydrocarbons D. alcohols or hydrocarbons
All of the following describes preformed toxins EXCEPT:
A. it associated with Staphylococcus aureus, Bacillus cereus and botulism caused by Clostridium botulinum B. the symptoms caused by preformed toxin occur much sooner than for other forms of poisoning C. the bacteria do not need to grow for the symptoms to occur D. the poisoning may be treated successfully by giving a high dose of broad spectrum antibiotics