A difference in charge between guard cell cytoplasm and extracellular fluid is called ____
a. osmosis
b. tension
c. turgor
d. pressure gradient
e. voltage
ANSWER: e
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Viruses exhibit all the following except ________.
A. genes B. ultramicroscopic size C. definite shape D. metabolism E. ability to infect host cells
Which of the following statements most likely
apply to the earliest cells?
a. They were prokaryotic cells. b. It is likely that earliest cells did not have a nucleus but had membrane-bound organelles. c. The earliest cells may have used oxygen gas in order to thrive successfully. d. Energy from the sun may have been used by the earliest cells. e. All of these statements most likely apply
Although we know of threats to about ____ wild plant species, the actual number is likely much higher
a. 5,000 b. 7,000 c. 12,000 d. 37,000 e. 130,000
Under certain circumstances, a person's resident biota can act as opportunistic pathogens.
Answer the following statement true (T) or false (F)