Hormone levels and action are determined by ____
a. other hormones or releasing agents
b. carbohydrate activity
c. positive feedback systems
d. prostaglandins
e. touch receptors
ANSWER: a
Biology & Microbiology
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The liquid component of the cytoplasm is known as the
A. cytoskeleton. B. thylakoid. C. stroma. D. cytosol.
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Air enters human lungs from the mouth by passing through the ________.
A. posterior air sacs B. trachea C. spiracles D. esophagus E. nasal cavities
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HIV is effectively transmitted by
a. food. b. air. c. water. d. casual contact. e. bodily fluids.
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A. In which scientific unit is the strength of a chemical bond usually expressed?
B. If 0.5 kilocalories of energy are required to break 6 × 1023 bonds of a particular type, what is the strength of this bond?
Biology & Microbiology