The proposition that the mitochondria in our cells descended from engulfed bacteria is called the ________ theory
Fill in the blank(s) with correct word
endosymbiont
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A benefit of alternate splicing of introns out of mRNAs is that
A) it maximizes the number of introns. B) it increases the number of proteins that the genome encodes. C) it lowers the risk of infection. D) it speeds transcription.
The process that a tall tree uses to move water to the leaves at the top of the tree involves primarily
a. cohesion and evaporation. b. evaporation and pumps. c. capillary action and pumps. d. positive pressure from roots and cohesion. e. capillary action and positive pressure from roots.
The muscular digestive organ in which food is
ground into small bits in birds is the a. intestine. b. gizzard. c. crop. d. stomach. e. cloaca.
According to the fossil record, the oldest vascular plants are placed in the phylum:a
Rhyniophyta. b. Bryophyta. c. Anthocerophyta. d. Pteridophyta. e. Lycopodiphyta.