________ bacteria convert nitrate into atmospheric nitrogen.
A. Denitrifying
B. Ammonifying
C. Nitrifying
D. Detritivorous
Answer: A
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Which of the following correctly matches the name of a biological clock to the timescale at which it operates OR the type of activity with which it might be associated?
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At sea level, what percentage of the air we breathe is oxygen?
a. 21% b. 30% c. 50% d. 79% e. 100%
Glucose is used by cells to make energy. Which other molecule can be used by the cell to make energy?
Where might you put a green, unripe fruit to ripen it?
A) a dark but well-ventilated area B) a sealed plastic bag with an overripe banana C) a microwave, on low power, for 5 minutes D) under a bright light for 24 hours