There are an estimated __________ number of
bacteria alive today.
a. 5 x 1030
b. 5 billion
c. 50 million
d. 5 trillion
e. none of these
Answer: a
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All of the following are components of nonspecific immunity EXCEPT
A. skin. B. phagocytes. C. complement. D. lysozyme. E. B cells.
The two strands of a DNA double helix are held to each other by ____ bonds between nitrogenous bases
a. phosphodiester b. disulfide c. glycosidic d. hydrogen e. peptide
An __________ consists of an array of organisms along with nonliving components of their
environment. Fill in the blank(s) with the appropriate word(s).
Which sequence of classification categories is in the proper order from least to most inclusive?
(a). genus, class, kingdom, domain, order, phylum, species, family (b). domain, class, genus, family, species, order, phylum, kingdom (c). species, genus, family, order, class, phylum, kingdom, domain (d). genus, species, order, class, family, kingdom, domain, phylum (e). species, genus, family, class, order, phylum, kingdom, domain