A red blood cell is in an artery in the right leg. How many capillary beds will it pass through before it returns to the left atrium of the heart?
A) none
B) one
C) two
D) three
Answer: C
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Which of the following best describes the overall scheme of typical plant development?
a. Growing tips and zones are present throughout a plant's life, and final plant form is not influenced by the environment. b. Growing tips and zones are present throughout a plant's life, and plant bodies do not have a fixed final size. c. Plant bodies do not have a fixed final size, and final plant form is not influenced by the environment. d. Plant bodies have a fixed fi
When neurons are not producing electrical signals, there is still a voltage difference across their membranes. What is this voltage called?
A. Resting potential B. Ion current C. Channel-gate bias D. Electrolyte voltage E. Equilibrium potential
Which of the following is not true of hydrocarbons?
A) Octane is a hydrocarbon. B) Hydrocarbons are insoluble in water. C) Many hydrocarbons are used in living systems. D) Only hydrogen atoms are used to complete the valence requirements of carbon. E) Phospholipids have hydrocarbon tails.
Most of the water vapor in the Earth's atmosphere comes from evaporation from ____
a. lakes b. rivers c. land d. oceans e. plants