A host plant race may develop ____
a. only when an organism’s genes for the host choice change
b. only when an organism’s genes for mating preferences change
c. only when a geographical barrier exists
d. when genes for the host choice mating preferences change
e. when genes for mating preferences change and geographical barriers exist
ANSWER: d
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A chromosome whose centromere is placed very close to, but not at, one end is called a(n) ____________________ chromosome
Fill in the blank(s) with correct word
Answer the question using the accompanying figure. Which image represents the position of the Earth during the
vernal (March) equinox?
a. a b. b c. c d. d e. A and C
Fossils of the earliest known true hominins are
approximately how many millions of years old? a. more than 20 b. about 10 c. between 7 and 2 d. less than 0.5 e. none of these
Gram-negative bacteria contain _______ which, when released into the bloodstream, cause fever, low blood pressure, and inflammation.
a. chitin b. cellulose c. peptidoglycan d. lipopolysaccaride