How many unrooted trees are possible for a 13-species tree and a 22-species tree, respectively?
a. more than the stars in the universe c. 15 and 25
b. 105 and 945 d. 13 and 22
A
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An advantage of asexual reproduction is that it _____
A) allows the species to endure long periods of unstable environmental conditions B) enhances genetic variability in the species C) enables the species to rapidly colonize habitats that are favorable to that species D) produces offspring that respond effectively to new pathogens E) allows a species to easily rid itself of harmful mutations
When retinal in bacteriorhodopsin becomes excited, it directly catalyzes the formation of ATP
Indicate whether the statement is true or false.
After the zygote has surpassed 100 cells, during cleavage, it becomes known as which of the following?
a. morula b. gastrula c. blastula d. flatula
Plants lacking a well-developed vascular system, true roots and leaves are informally known as
a. gametophytes b. sporophytes c. angiosperms d. gymnosperms e. bryophytes