When testing the effectiveness of a new cleaning product, which sample would be more valid?
a. 222 bacteria in the Petri dish
b. None of the samples are valid
c. 14 bacteria in the Petri dish
d. All samples are equally valid.
e. 3 bacteria in the Petri dish
a
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The parasite Plasmodium reproduces in which cells of the human body?
a. brain b. digestive tract c. kidney d. red blood cells and liver e. white blood cells
How does a transcribable vector differ from an expression vector?
What will be an ideal response?
Eyes are relatively vulnerable to infection because
A. there is scant normal microbiota to serve a protective role. B. immune privilege restricts access to the cells conferring innate immunity. C. they are not covered by keratinized epithelium. D. All of these answers are correct.
Which of the following would be best to differentiate Group A from Group B streptococcus?
A. Hydrolysis of sodium hippurate B. Production of the enzyme catalase C. hemolysis activity D. hydrolysis of esculin