In studies of prion proteins in cell culture, the abnormal prions
A. "hijack" deoxyribonucleic acid (DNA) in order to produce more abnormal prions.
B. convert normal prions into the abnormal form.
C. increase calcium influx, which triggers apoptosis.
D. enhance the expression of death genes that produce caspases.
Answer: B
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Imagine that you give a group of animals the following events in the order they are shown: tone --> food THEN tone AND light --> food. What is the likely outcome when conditioning to the light is tested?
a) Conditioning will occur only to the tone. b) Conditioning will occur only to the light. c) Conditioning to the light will be weaker than to the tone. d) Conditioning to the light will be stronger than to the tone.
Which communication network shape is the most decentralized?
a. circle b. wheel c. chain d. concom