Dentinogenesis imperfecta is a rare, autosomal, dominantly inherited disease of the teeth that occurs in about one in 8000 people (Witkop 1957). The teeth are somewhat brown in color, and the crowns wear down rapidly. Assume that a male with
dentinogenesis imperfecta and no family history of the disease marries a woman with normal teeth. What is the probability that their first two children will have dentinogenesis imperfecta?
A) 1/8 B) 1/4 C) 100% D) 3/4 E) 1/2
Answer: B
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An action potential occurs in the postsynaptic muscle cell when ____________________
a. acetylcholine binds to the receptors on the muscle cell b. when calcium functions as a neurotransmitter c. the sodium–potassium pump moves ions across the membrane d. all of these
If the enzyme catalyzing the N to O reaction is inhibited, there will be a build-up of which compound?
a. M b. N c. O d. P e. Q
Protein-encoding genes in eukaryotes are transcribed by
a. RNA polymerase I. b. RNA polymerase II. c. RNA polymerase III. d. either RNA polymerase I or III. e. either RNA polymerase II or III.
There are over 11,500 species of these protists that have ornate, glass-like shells.
A) radiolarians B) foraminiferans C) dinoflagellates D) diatoms