In which of the following ways are dendrites and axons similar?
A) The presence of branching
B) both release neurotransmitters
C) both have vesicles
D) All of the above
Answer: A) The presence of branching
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What is the hydronium ion (H3O+) concentration in a solution at pH 5?
A. 5 × 105 M B. 1 × 105 M C. 1 × 10-5 M D. 5 × 10-5 M E. 2 × 10-1 M
What type of feedback is exemplified by the formation of a blood clot that results in the rise of blood pressure?
A. negative feedback B. positive feedback C. endocrine feedback D. nervous feedback E. hormonal feedback
The pH scale measures ________
A) OH- concentration B) buffer concentration C) H+ concentration D) All of the above are true.
Which one of the following statements is TRUE regarding the nitrogen cycle?
A) Nitrogen fixation results in the production of nitrogen from carbon. B) Atmospheric nitrogen is unavailable to living organisms because two nitrogen atoms are held tightly together by a triple covalent bond. C) Plants take up ammonia directly from the atmosphere. D) Once nitrogen is "fixed," it must then be converted to nitrogen gas before living organisms can use it. E) In a balanced ecosystem, nitrogen fixation occurs more often than denitrification.