What is a point mutation?
a. Mutation of the stop codon
b. Replacement of one nucleotide in the normal gene with a different nucleotide
c. Addition of one nucleotide in the normal gene
d. Deletion of one nucleotide in the normal gene
ANS: B
Replacement of one nucleotide in the normal gene with a different nucleotide is a point mutation. This results in a different amino acid and can affect the protein's function.
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Medications to treat extrapyramidal side effects from antipsychotic medications, as well as drugs used to treat Parkinson's disease, achieve their therapeutic effects by:
A) enhancing the effects of acetylcholine, an inhibitory neurotransmitter, in the basal ganglia. B) blocking the release of dopamine from the substantia nigra in the basal ganglia. C) blocking the transmission of neural impulses through the pyramidal decussation of the brain. D) increasing the amount of dopamine at the receptor sites in the basal ganglia.
Strands of wire used to attach arch bars to the upper and lower jaw should be prestretched and cut to which length?
a. 5 cm b. 10 cm c. 15 cm d. 20 cm