Molecular sequence analysis has revealed that Crustacea is paraphyletic, because it includes an ancestor but not all of
its descendants; the descendants not included in this clade are the ____.
a. trilobites
b. myriapods
c. hexapods
d. annelids
e. chelicerates
ANSWER: c
Biology & Microbiology
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Crick's proposed "adaptor molecule" is now known to be:
A. mRNA. B. rRNA. C. tRNA. D. imRNA.
Biology & Microbiology
A fat molecule has ____ fatty acids
a. 1 b. 2 c. 3 d. 4 e. 5
Biology & Microbiology
If the size of a cell doubles what will be the
surface area to volume ratio?
a. 8 to 4 b. 4 to 8 c. 16 to 4 d. 16 to 8 e. 64 to 16
Biology & Microbiology
Cells use exocytosis to
A) ingest nutrients. B) pump hydrogen molecules across the membrane. C) create new cells. D) release substances from the cell. E) move away from danger.
Biology & Microbiology