In the second phase of photosynthesis, chemical energy + __________ = sugar

a. carbon dioxide
b. nitrogen
c. oxygen
d. water


A

Biology & Microbiology

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In a forest, trees that get more sunlight grow taller than other nearby trees.  This is a form of ______  

A.  natural selection. B.  directional selection. C.  artificial selection. D.  disruptive selection. E.  stabilizing selection.

Biology & Microbiology

Recent research has indicated that for human _____, vocal pitch changes may be associated with fertility

a. males b. females c. males and females d. females during menopause e. males during puberty

Biology & Microbiology

Which structure "unzips" the double helix of DNA during transcription?

A. an anticodon B. mRNA C. IRNA D. RNA polymerase

Biology & Microbiology

Shingles is a medical condition that usually occurs years after chickenpox, even though no illness is present in the intervening period of time. This occurs because human herpes virus-3 (HHV-3) is capable of __________.

A. latent infection B. lytic infection C. persistent infection D. lysogenic infection

Biology & Microbiology