With increased levels of oxidizable materials, the biochemical oxygen demand (BOD) will
A) increase.
B) decrease.
C) remain the same.
D) increase or decrease depending on the nature of the materials involved.
Answer: A
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Nutrient transport requires energy because the nutrients must be transported into the cell against a concentration gradient. The energy required for nutrient transport is supplied by
A) ATP. B) the proton motive force. C) phosphoenol pyruvate. D) ATP, the proton motive force, or phosphoenol pyruvate.
During the ____ phase of the cardiac cycle, blood enters the ventricles. During the ____ phase, blood exits the ventricles
Fill in the blank with the appropriate word.
Hershey and Chase relied on ________ to physically separate the infected bacterial cells from the phage ghosts.
A) radioactivity B) gel filtration C) ion exchange D) centrifugation
The structure that is compared to a whip is a(n)
a. microfilament. b. intermediate filament. c. cilium. d. flagellum. e. microtubule.