The neurotransmitter nitric oxide (NO) ____________.
A) is a human pheromone released outside the body
B) has more than one target in the body
C) is the only neurotransmitter that is a gas
D) does not function in the nervous system of mammals
E) is stored in vesicles of the synaptic terminal of neurons
Answer: B) has more than one target in the body
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Which PCR step synthesizes complimentary DNA strands?
A. Cool DNA to between 50°C and 65°C. B. Add DNA polymerase and nucleotides at 72°C. C. Repeat the cycle of heating and cooling. D. Add primers. E. Heat target DNA to 94°C.
Science can best be described as
A) a search for the ultimate truth. B) a search for evidence that proves our concepts wrong. C) proving facts. D) a complete lack of dissent amongst ideas to obtain the truth.
Which item would probably contain the most heat?
A) a cup of coffee that is 140 degrees F B) a person that is 98.6 degrees F C) a large lake filled with water that is 72 degrees F D) a smoldering campfire ember that is 400 degrees F
Why do the deciduous leaves on temperate forest trees turn from green to orange, red, and/or yellow before falling?
A) The chlorophyll changes color as it's broken down. B) The chlorophyll is absorbed by the tree, leaving the other pigments visible. C) New photosynthetic pigments are created as the amount of daylight becomes limited. D) New pigments are created in response to colder temperatures.