The generally accepted explanation for the

movement of organic compounds in phloem is
a. the cohesion-tension theory.
b. the pressure flow theory.
c. active transport.
d. the transpiration-pull theory.
e. root pressure.


B

Biology & Microbiology

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Before the evolution of photosynthesis, early cells extracted energy from ____

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Which of the following DNA sequences would be the most likely to be damaged by UV radiation?

ATGCACATGA GACACGTAGA GCATGACATA CTTGAATTAA

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The protective covering of the brain is the

a) ventricles b) meninges c) tectum d) olfactory and optic bulbs e) pineal gland

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When two amino acids combine via a dehydration reaction,

A. the R groups are lost. B. a peptide bond is formed. C. the amino group of each join together. D. water is added to begin the reaction. E. the carboxyl group of each join together.

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