A solution of pH 5 is how many times more acidic that one of pH 7?
A) 0.5
B) 10
C) 2
D) 100
Answer: D) 100
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The rate of oral cancer has risen steadily since 1973, and many health experts believe that this increase is related to the transmission of:
a..HIV. b..HPV. c..HSV-2. d..HSV-1.
An attenuated strain of a pathogen
A) has lost its virulence, but may be used to create a vaccine. B) has changed its antigens to avoid an adaptive immune response. C) is more virulent than the regular strains and may cause septic shock. D) is an extracellular pathogen that will be cleared by innate immunity.
The outer layer of the mammalian kidney is the ____, and the inner layer is the ____
A. cortex; medulla B. medulla; cortex C. nephron; medulla D. cortex; nephron E. nephron; renal pyramid
When a ruminant "chews his cud," it involves regurgitation from which two digestive chambers?
a. abomasum and omasum b. abomasum and rumen c. omasum and rumen d. rumen and reticulum e. reticulum and omasum