Thirty-six colonies grew in nutrient agar from 1.0 ml of undiluted sample in a standard plate count. How many cells were in the original sample?
A) 36
B) 9
C) 18
D) 4
E) 72
A) 36
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True or false: Experiments generating simple molecules under conditions resembling that of early Earth demonstrate that the first cells are likely to be extremely similar to cells found today
A. true B. false
The SA node, also known as the __________, spontaneously generates the action potentials that set the
pace for cardiac contractions. Fill in the blank(s) with the appropriate word(s).
Which statement describes organs?
A) Each organ has a single function within the body. B) An organ always contains at least three different tissue types. C) Failure of an individual organ can affect an entire organ system. D) Most organs function to provide the body with energy.
If a shoot's tip breaks off, ____ levels rise and stimulates cell divisions in the lateral buds.
A. auxin B. gibberellin C. cytokinin D. abscisic acid E. ethylene