Answer the question using the accompanying figure. The atom depicted in this figure can form ____ covalent bonds
with another atom.
a. 0
b. 2
c. 4
d. 3
e. 6
ANSWER: c
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Sperm mature and are stored in the epididymis
a. True b. False Indicate whether the statement is true or false
Propose a valid reason to explain why is it critical that the K+ channel activation gate responds slightly slower to depolarization than the Na+ channel activation gate.
A. If both gates showed identical response times, movements of Na+ and K+ ions would cancel out each other's effects on membrane potential changes. B. If both gates showed identical response times, movements of Na+ and K+ ions would magnify each other's effects on membrane potential changes, creating dangerously large action potentials. C. It is not critical and there would be no change in action potential characteristics if this difference in response time did not exist. D. The conformational change in one gate is necessary to trigger the activation of the other.
A(n) ____ environment is ideal for plant cells, while a(n) ____ environment is best for animal cells
a. isotonic; hypotonic b. hypotonic; isotonic c. hypotonic; hypertonic d. hypertonic; isotonic e. isotonic; isotonic
Specific cells in developing seeds and maturing fruits have receptors for ethylene, but cells in stems
generally do not.
Indicate whether the statement is true or false.