A toxin interferes with the opening of Na+ channels in the postsynaptic membrane so they open more
slowly when bound to a neurotransmitter. What effect would there be on action potential formation in
the postsynaptic membrane?
What will be an ideal response?
This would cause a postsynaptic membrane action potential to form more slowly (if at all), as well as
slow action potential propagation speed.
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Individuals that are heterozygous for sickle-cell anemia are more resistant to malaria than those that do not have a sickle-cell allele. Why does the sickle-cell allele not become fixed in the population?
A. Individuals homozygous for the sickle-cell allele do not have the same resistance to malaria. B. Individuals that are homozygous without the sickle-cell allele produce more offspring than those with the sickle-cell allele. C. Individuals that are homozygous for the sickle-cell allele have sickle-cell anemia, and are at a fitness disadvantage. D. Individuals heterozygous for the sickle-cell allele die earlier than either of the homozygous individuals. E. Analysis indicates the allele is becoming fixed in the population.
Which condition does not involve a defect in an enzyme pathway?
A) Alkaptonuria B) Albinism C) Sickle cell anemia D) Phenylketonuria (PKU)
Write the empirical formula for a carbohydrate
Fill in the blank(s) with the appropriate word(s).
The first response in adaptive immunity is
a. the production of white blood cells. b. the production of complement. c. the production of interferon. d. inflammation. e. wound healing