Darwin referred to the evolutionary origin of angiosperms as an “abominable mystery,” because they seem to appear
suddenly in the fossil record.
a. True
b. False
ANSWER: True
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The eyes of fishes are adapted for black and white vision
Indicate whether the statement is true or false
Water that moves through nonliving regions of root, such as air spaces in root tissue, is following the
a. symplastic pathway. b. transmembrane and symplastic pathways. c. transmembrane pathway. d. apoplastic, transmembrane, and symplastic pathways. e. apoplastic pathway.
The formation of amino acids under abiotic
conditions was important because they serve as a. a supply of structural units for proteins. b. enzymes to catalyze reactions. c. subunits in the formation of DNA. d. subunits in the formation of RNA. e. subunits for the formation of lipids.
The primary transcripts in eukaryotes are most accurately described as
A. a faithful copy of the entire gene including exons and introns. B. an exact copy of the gene, but the introns have been removed. C. an RNA copy, but the noncoding exons and introns have been removed. D. having the exons removed and the introns retained for translation. E. composed of RNA polymerase and associated histones.