All sensory receptors are able to initiate nerve impulses by opening or closing
A. exteroceptors.
B. stimulus-gated channels.
C. voltage-gated channels.
D. interoceptors.
Answer: B
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Which of the following autoimmune diseases can potentially be avoided by preventing or completely curing a Streptococcus infection?
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What is the effect of a nonsense mutation in a gene?
A. It introduces a premature stop codon into the mRNA. B. It alters the reading frame of the mRNA. C. It has no effect on the amino acid sequence of the encoded protein. D. It prevents introns from being excised. E. It changes an amino acid in the encoded protein.
The kidneys are important homeostatic organs, contributing to maintenance of all of the following except
A. blood pressure. B. blood volume. C. blood pH. D. destruction of worn-out red blood cells. E. ion concentration of extracellular fluids.