Miller’s reaction chamber contained gases intended
to simulate the atmosphere of the ancient Earth.
Which of the following gases was NOT included?
a. carbon dioxide
b. methane
c. ammonia
d. water vapor
e. hydrogen gas
Answer: a
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When, if ever, do molecules stop moving?
A) At absolute zero (-273.15°C) B) At the freezing point (0°C) C) At the boiling point (100°C) D) Never
The phenomenon in which electrons are transferred from molecule to another is termed a redox reaction.
a. true b. false
In an unstimulated neuron, the sodium-potassium pump maintains the concentration gradient of sodium and potassium ions by transporting
A) potassium ions out of and sodium ions into the cell. B) sodium and potassium into the cell. C) sodium and potassium out of the cell. D) sodium and potassium ions in both directions across the cell membrane. E) potassium ions into and sodium ions out of the cell.
Water moves up the xylem as a result of
1) Surface tension 2) Gravity 3) The polarity of water 4) Both A and C