In the chemical shorthand, 14C, the 14 represents the number of ____
a. excess neutrons
b. protons plus neutrons
c. electrons
d. protons plus electrons
e. radioactive particles
ANSWER: b
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Pattern baldness is an example of a(n)
a. sex-linked trait. b. sex-influenced trait. c. sex-limited trait. d. sex-exclusive trait. e. inactivation trait.
Stomata are:a
waxy layers that cover leaves. b. openings in the leaf epidermis. c. extensions of bundle sheaths. d. particularly numerous on the upper epidermis. e. guarded by two stipule cells.
The area where the petiole detaches from the stem is referred to as the:a
abscission zone. b. middle lamella. c. bundle sheath extension. d. terminal bud. e. bud scale scar.
Which of the following factors may be directly responsible for maintaining a sharp edge between prairies and forests in the midwestern United States?
A) summer drought B) low winter temperatures C) tornadoes D) fire