Pain receptors are activated by tissue damage, but pain perception requires intact, functional neurons. How does this work?
A. The nociceptor neuron only sends action potentials as it is dying.
B. The neuron itself does not need to be damaged; it responds to signals released by nearby damaged cells.
C. Nociceptor neurons have special membrane repair mechanisms.
D. The axon continues to fire action potentials despite damage to the cell body.
Answer: B
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Complete the following sentence. An exon is _______________________
A. a protein that is clipped out post- translationally B. RNA that is removed during the processing of an RNA molecule and remains inside the nucleus C. part of an intact, mature mRNA that leaves the nucleus D. a transfer RNA that binds to the codon E. a series of amino acids at the end of a new polypeptide that directs transcription to the ER
Which of the following does not occur during the first trimester of pregnancy?
A. All of these events occur during the first trimester. B. cleavage C. gastrulation D. organogenesis E. sex determination
With both incomplete dominance and codominance, one expects heterozygous and homozygous classes to be phenotypically identical
Indicate whether the statement is true or false
A dehydrated runner drinks a lot of water after a race. They rehydrate because
A. the stomach and bloodstream are isotonic compared to each other. B. the bloodstream is hypotonic compared to the stomach. C. water will diffuse from a low to high concentration. D. the stomach is hypotonic compared to the bloodstream.