From the standpoint of evolutionary fitness, it is expected that genes with a high rate of expression will make use of amino acids that are ________ than those amino acids used by genes with a low rate of expression
A) more common
B) more energetically economical
C) more energetically costly
D) rarer
E) None of these
B
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The substance O2 is considered to be
a. both a molecule and a compound. b. a compound but not a molecule. c. neither a molecule nor a compound. d. a molecule but not a compound. e. a chemical but not a biological molecule.
Which fish bones are homologous with an amphibian's front and hind limbs?
a. Tail, pectoral fin b. Pectoral fin, pelvic fin c. Pelvic fin, dorsal fin d. Pectoral fin, dorsal fin e. Gills, pelvic fin
The terms proto-oncogene and oncogene may give the misleading impression that these are "genes for cancer" that are waiting to be turned on
What are these genes, in terms of normal function, and what name might have been given to them to reflect this function rather than their role in cancer?
Invertebrate chordates include __________ and __________, both marine filter-feeders.
Fill in the blank(s) with the appropriate word(s).