Which enzyme is produced by the stomach?
a. amylase
b. pepsin
c. trypsin
d. lipase
Ans: b. pepsin
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A sharp reduction in the incidence of Haemophilus influenzae serotype b infections is principally due to
A. the elimination of the natural reservoir of H. influenzae. B. the development of an effective vaccine. C. improvements in sanitary conditions in meat processing plants. D. the discovery of new antibiotics.
The charges on a water molecule are distributed equally
Indicate whether the statement is true or false
When DNA is cut with a restriction enzyme, the resulting fragments have
A) 5' carboxyls. B) 5' hydroxyls. C) 3' hydroxyls. D) 3' phosphates. E) 3' carboxyls.
Which fungal phylum includes members that create a special, resistant zygospore during sexual reproduction?
a. Zygomycota b. Ascomycota c. Chytridiomycota d. Basidiomycota