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

Biology & Microbiology

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When differentiation occurs, cells may also change in  

_____ genetic content. _____ size. _____ shape.

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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.

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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.

Biology & Microbiology

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

Biology & Microbiology