The gas tail of a comet always
a. trails behind the head along the orbital path.
b. extends ahead of the head along the orbital path.
c. points toward the Sun.
d. points away from the Sun.
e. points perpendicular to the orbital path.
d
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Why do researchers think the first self-replicating molecule was RNA?
A) RNA is the only type of molecule that can catalyze a chemical reaction. B) RNA can carry information and catalyze chemical reactions. C) Self-replicating molecules of RNA exist today, in human cells. D) Fossil evidence of such a molecule was recently discovered.
Fungi are more closely related to plants than they are to animals
A. true B. false
2,4-D, a potent eudicot weed killer, is most likely a synthetic ____
a. auxin b. gibberellin c. cytokinin d. phytochrome e. brassinosteroid
Genes from different organisms with similar sequences or open reading frames (ORFs) are called ________.
Fill in the blank(s) with the appropriate word(s).