Which two nucleotides also serve as transporters of chemical energy?
a. ATP and GTP
b. ATP and CTP
c. ATP and TTP
d. CTP and TTP
e. CTP and UTP
ANSWER: a
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The part of a flowering plant that becomes the fruit is the ________
a. ovule b. embryo sporophyte c. zygote d. ovary
The first cells appeared about ________ billion years ago.
A. 2 B. 5 C. 4.5 D. 1 E. 3.5
The outermost whorl of a flower typically consists of one or more
a. petals. b. carpels. c. stamens. d. receptacles. e. sepals.
A certain species of butterfly varies in color from white to dark blue. The birds found in the same area feed on the white or lightly colored butterflies, leaving butterflies that are darkly colored. This is an example of what type of selection?
A. stabilizing selection B. directional selection C. disruptive selection D. artificial selection