In most plants stomata are ____
a. open during the night and closed during the day
b. nearly always open
c. closed only when guard cells are not exposed to sunlight
d. almost never open
e. open during the day and closed during the night
ANSWER: e
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Men are 20 times more likely to develop systemic lupus erythematosus (SLE) than women
Indicate whether the statement is true or false.
Describe the modern techniques for studying marine biology and the dissemination of information about marine biology
What will be an ideal response?
A polysome is
a. one of the units of a ribosome. b. the nuclear organelle that synthesizes RNA. c. an organelle that functions similarly to a ribosome during meiosis. d. the two units of a ribosome considered together. e. an mRNA molecule with several ribosomes attached.
True or false: observations allow scientists to draw tentative explanations called hypotheses
A. true B. false