Blood moves very rapidly in the capillaries.
a. true
b. false
Ans: b. false
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Upon activation by stomach acidity, the secretions of the parietal cells _____
A) initiate the chemical digestion of protein in the stomach B) initiate the mechanical digestion of lipids in the stomach C) initiate the chemical digestion of lipids in the stomach D) include pepsinogen E) delay digestion until the food arrives in the small intestine
All flagellated protozoans _____
a. lack mitochondria c. live as single cells b. are photosynthetic d. cause disease
How are the five nucleotides similar to each other?
a. All five are composed of a phosphate group, sugar, and a nitrogenous base. b. All five contain the same nitrogenous base. c. All five have the same number of atoms.
Which of the following components was NOT
a significant part of the earth's early atmosphere?
a. carbon dioxide b. water vapor c. nitrogen gas d. oxygen gas e. hydrogen gas