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
ANSWER: b
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All of the following occur in both DNA and RNA EXCEPT
a. four nitrogenous bases. b. a phosphate–sugar backbone. c. a double-stranded molecule. d. All of these are found in both DNA and RNA
________ involves an insufficient amount of several neurotransmitters, such as serotonin, dopamine, and norepinephrine, for extended periods of time
Fill in the blank(s) with correct word
In which process is the enzyme nitrogenase most directly involved?
a. nitrification b. ammonification c. nitrogen cycling d. nitrogen fixation
What would you find in the heart of an amphibian?
A. two atria and one ventricle B. two atria and two ventricles C. two atria and a partially divided ventricle D. one atrium and one ventricle E. one atrium and two ventricles