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
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Before the evolution of photosynthesis, early cells extracted energy from ____
a. oxygen b. ATP c. NADPH d. water e. methane
Which of the following DNA sequences would be the most likely to be damaged by UV radiation?
ATGCACATGA GACACGTAGA GCATGACATA CTTGAATTAA
The protective covering of the brain is the
a) ventricles b) meninges c) tectum d) olfactory and optic bulbs e) pineal gland
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.