Chitin, a modified form of cellulose, is not only cross-linked with proteins but its glucose units are modified with atoms of
A. nitrogen.
B. hydrogen.
C. phosphorous.
D. sulfur.
E. oxygen.
Answer: A
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Which form of selection is most likely to contribute to speciation over time?
a. stabilizing selection b. directional selection c. diversifying selection d. sexual selection
__________ behavior is altered by experience. Fill in the blank(s) with the appropriate word(s)
Pure-breeding yellow guinea pigs crossed with pure-breeding white ones produce only cream-colored
offspring. This pattern indicates incomplete dominance. Rough hair is found to be dominant to smooth hair. Give the F1 and F2 genotypic and phenotypic ratios of a cross of a smooth, white guinea pig with a homozygous, rough, yellow guinea pig. What will be an ideal response?
Photosynthesizing plants rely on water to
a) replace electrons that are excited by light energy and passed from molecule to molecule down and electron transport chain b) replenish oxygen molecules that are lost during photosynthesis c) provide the protons necessary to produce chlorophyll d) concentrate the beams of light hitting a leaf, focusing then on the reaction center e) serve as a high-energy electron carrier