Even though the autumn may be unusually warm, the leaves from deciduous trees begin to drop during September
Which of the following is the best explanation?
a. The trees are responding to shorter days.
b. The autumn months are usually wetter because the summer rains were delayed.
c. The effects of phototropism are operating "right on schedule."
d. There is not enough sunlight to carry on photosynthesis any longer.
e. The trees are responding to consistent temperatures.
ANSWER: a
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Indicate whether the statement is true or false
Which of the following statements is false?
(a) Proteoglycans can act as filters to regulate which molecules pass through the extracellular medium. (b) The negative charge associated with proteoglycans attracts cations, which cause water to be sucked into the extracellular matrix. (c) Proteoglycans are a major component of compact connective tissues but are relatively unimportant in watery tissues such as the jellylike substance in the interior of the eye. (d) Glycosaminoglycans are components of proteoglycan.
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a. 2 b. 3 c. 4 d. 7 e. 8