Where would a ligand-gated ion channel typically be found on a neuron?
A) Presynaptic membrane
B) Axon hillock
C) Postsynaptic membrane
D) Ligand-gated ion channels are not found on neurons.
E) Axon
Answer: C) Postsynaptic membrane
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A patient in his forties is diagnosed with Huntington disease. The patient's mother is healthy and a genetic evaluation shows 25 and 26 CAG repeats within her HTT alleles
The patient's father died at age 24 when the patient was 2 and no genetic evaluation can be done. It is most likely that: A. the father was heterozygous for the defective HTT allele. B. the father was homozygous for the defective HTT allele. C. the mother is a carrier for the defective HTT allele. D. the HTT gene acquired additional CAG repeats during the 40 years of the patient's life.
Which of the following hormones counteract each other in regulating calcium homeostasis?
A. antidiurectic hormone and aldosterone B. atrial natriuretic peptide and aldosterone C. parathyroid hormone and vitamin D (1,25 dihydroxyvitamin D) D. antidiurectic hormone and parathyroid hormone E. antidiurectic hormone and vitamin D (1,25 dihydroxyvitamin D)
If a species A has 10 organisms living in a given area, and species B has 1,000 organisms living in the same area, species B could be described as which of the following?
a. having a lower death rate compared to species A b. having a higher growth rate compared to species A c. having a higher species richness compared to species A d. having a lower species richness compared to species A
Which of the following plant hormones was studied in the 1880s by Charles and Francis Darwin in experiments on phototropism?
A. abscisic acid B. ethylene C. cytokinin D. auxin E. gibberellin