The ligand for nicotinic receptors is acetylcholine.
a. true
b. false
Answer: a. true
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Which genetic disorder is associated with DNA repair issues?
a. sickle-cell anemia b. Alzheimer’s disease c. Werner’s syndrome d. Will’s disease e. cystic fibrosis
"Jumping genes" that have the ability to move within and between chromosomes are called
A. oncogenes. B. transposons. C. introns. D. retroviruses. E. exons.
Conservation biologists are often concerned that when the population size of an endangered species becomes too small it is at risk of extinction for which reason?
A. They can no longer evolve. B. Their rate of breeding will decline. C. They may be more susceptible to changes in the environment or disease. D. They are at risk of sympatric isolation. E. They are at risk of developing prezygotic barriers to reproduction.
The columns in Figure 15-3 represent F (for female), C (for children), and M (for male). The presence of the band marked with arrow #2, shows that:
a. this DNA sequence in the children is a mutation.
b. this DNA sequence in the children is inherited from their mother.
c. this DNA sequence in the children is inherited from their father.
d. this sequence in the children is inherited from both their mother and father.
e. individual F is not the mother of these children.