An action potential is propagated down an unmyelinated neuron plasma membrane because
a. the action potential stimulates voltage-gated Na+ channels adjacent to it.
b. the action potential stimulates voltage-gated Ca2+ channels adjacent to it.
c. the action potential stimulates voltage-gated K+ channels adjacent to it.
d. the action potential stimulates voltage-gated Na+ and Ca2+ channels adjacent to it.
e. the action potential stimulates voltage-gated k+ and Ca2+ channels adjacent to it.
D
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Achondroplasia is a form of dwarfism in humans. It is caused by a mutant allele of the fibroblast growth factor receptor gene (FGFR) that produces an overactive protein. Having one copy of the mutant allele results in dwarfism. Two copies of the mutant allele results in death before birth. If two people with achondroplasia have a child together, what is the probability that their child will also have achondroplasia?
A) 0 B) 1/2 C) 2/3 D) 3/4 E) 1
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When defining terrestrial biomes, which of the following information is most useful?
a. chemical resources of the soil b. average temperature and rainfall c. salinity of the water d. average energy available e. number of animal species present
Explain why X-ray diffraction was important in the study of DNA structure and describe the procedure used in X-ray diffraction
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