Why is the rate of CO2 exchange roughly equivalent to that of O2 despite its less steep pressure gradient?
A. CO2 diffuses much more rapidly out of the cells.
B. CO2 binds to O2 and moves across the respiratory membrane simultaneously.
C. CO2 is more soluble in water than is O2.
D. CO2 is actively transported into the alveoli.
Answer: C. CO2 is more soluble in water than is O2.
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The correct structure of DNA components can be presented as
Phosphate - base- sugar Phosphate - sugar - base Base - phosphate- sugar Phosphate - sugar - phosphate - base Base - sugar - phosphate - base
The first electron shell can hold two electrons, while the second shell can hold up to _____________ electrons.
Fill in the blank(s) with the appropriate word(s).
Which of the following is true about osmosis?
A) Osmosis occurs when the concentration of water is the same as the concentration of solutes. B) Osmosis is the flow of water across a plasma membrane. C) Water may move up or down a concentration gradient during osmosis. D) Solutes always accompany the movement of water during osmosis.
Into which vein does blood in the external jugular vein drain?
A) inferior vena cava B) subclavian vein C) vertebral vein D) internal jugular vein