If the genetic code contained six nucleotides instead of four, and each amino acid were specified by a single codon, how many unique codons would exist?
a. 144
b. 96
c. 216
d. 256
c. 216
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Polypoidy, which is widespread among plants, can arise from which of the following processes? (Choose all that apply)
A. duplication of a complete set of chromosomes in a single species B. hybridization between related species followed by duplication C. deletion of long stretches of noncoding DNA over time D. introduction of DNA from one species into another via insects and birds E. expansion of regions of highly repetitive DNA
In the part of an embryo sac farthest away from the micropyle you should find ____
a. the central cell b. a seed c. the pollen tube d. synergids e. antipodal cells
In monocots, flower parts are typically in ____ or multiples of ____
a. threes; fours b. fours; fives c. threes, threes d. twos; twos e. fours; fours
The hormone that is antagonistic in action to glucagon is
a. norepinephrine. b. insulin. c. thyroxine. d. epinephrine. e. mineralocorticoids.