A small Dutch population settled in South Africa in the 17th century and became known as Afrikaners. By chance, a
few Dutch settlers carried the gene for Huntington’s disease. Today, Huntington’s disease occurs at a relatively high
frequency in this population. This is an example of ____.
a. the bottleneck effect
b. the founder effect
c. gene flow
d. artificial selection
e. natural selection
ANSWER: b
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Which one of the following statements about RNA is correct?
A. RNA is a more stable molecule than DNA. B. RNA has the same 5-carbon sugars as DNA. C. RNA uses the same pyrimidine bases as DNA. D. RNA uses the same purine bases as DNA. E. All of these choices are correct.
Where is the nucleus of a neuron found?
A. Cell body B. Myelin sheath C. Axon branches D. Dendrites E. Companion cell
The enzyme that removes the neurotransmitter acetylcholine from synapses after it has been released is known as ________
Fill in the blank(s) with correct word
_____ are forms of an element that differ in the number of neutrons that they carry
Fill in the blank(s) with correct word