Four of the five choices listed below are
characteristics of phloem. Select the exception.
a. consists only of cell walls
b. characterized by channels across plant cell walls
c. sieve plates found between some cells
d. includes accessory companion cells
e. transports sugar
Answer: a
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Which of the following can directly participate in creating the binding specificity of an enzyme active site? Choose all that apply
A. hydrophobic amino acid side chains B. hydrophilic amino acid side chains C. alpha helical regions of the polypeptide D. beta-sheet regions of the polypeptide E. negatively charged amino acid side chains F. positively charged amino acid side chains
Which of the following are the two major abiotic factors that shape terrestrial biomes?
a. precipitation and temperature b. temperature and soil c. organisms and climate d. precipitation and soil
Logistic population growth describes growth without limitation
Indicate whether the statement is true or false.
Select the choices that are ways that the hypothalamus controls the activity of the anterior pituitary.
a. neurons of the hypothalamus b. releasing hormones of the hypothalamus c. inhibiting hormones of the hypothalamus