The countries of ___ and ___ have the world’s
highest human populations.
a. India...China
b. China...United States
c. China...Brazil
d. India...United States
e. United States...Canada
A
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When differentiation occurs, cells may also change in
_____ genetic content. _____ size. _____ shape.
As light levels increase, some electrons from photosystem I are redirected from ____ back into the electron-transport chain
Fill in the blank with the appropriate word.
The kingdom Protista is
A. not considered a valid phylogenetic unit. B. composed of organisms that are very similar to one another. C. only contains single-celled organisms. D. not ecologically important.
What type of molecule carries amino acids to the ribosome during protein synthesis?
a. tRNA b. mRNA c. short proteins d. start codons e. RNA polymerase