The ________ receptor is a ligand-gated channel that carries chloride ions.
Fill in the blank(s) with the appropriate word(s).
GABA
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Which part of the leaf stores toxic or unpalatable compounds in order to deter grazing herbivores?
a. cuticle b. stomata c. trichomes d. mesophyll
Unlike bacterial operons, eukaryotic operons
A) are all positively controlled. B) are all negatively controlled. C) are restricted to certain eukaryotic kingdoms. D) are exceedingly rare. E) None of these
Closely related species, like chimpanzees and humans, often differ in chromosome number by only one or two chromosomes, suggesting that chromosomes can experience fission and fusion over evolutionary time. Can you think of a way to test this?
What will be an ideal response?
Which of these is required for natural selection to occur?
A) inheritance B) unequal reproductive success C) individual variation D) all of the above