Which of these tests is an in vivo test?
A. PCR
B. Agglutination test
C. Western Blot
D. Tuberculin test
Answer: D
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The killing of cells by UV irradiation involves
A) absorption at 260 nm by proteins only. B) absorption at 260 nm by RNA only. C) formation of pyrimidine dimers. D) formation of purine dimers.
The chances of surviving sudden cardiac arrest increases by ___ percent when the affected person receives
cardiopulmonary resuscitation (CPR) within ___ minutes after the event.
a. 100; a few b. 50; a few c. 50; 10 d. 100; 10 e. 50; 20
Carlos visited the desert for the first time and, as he was sweating a lot, bought some distilled water. This seemed to satisfy his thirst very well. Why is the distilled water not the best choice of beverage for Carlos?
What will be an ideal response?
Enzymes work to speed up a chemical reaction by:
A) increasing the activation energy of the reaction. B) lowering the activation energy of the reaction. C) heating up the substrate. D) attaching coenzymes to the substrate. E) supplying the energy needed for the reaction.