The all-or-nothing principle means that

a. all the nerve impulses go to the brain
b. an entire neuron depolarizes to its maximum strength
c. all the potassium ions on one side of the cell membrane move to the other side of the cell membrane
d. all the sodium ions on one side of the cell membrane move to the other side of the cell membrane

Stephen is a student who wants to test his knowledge of medical terminology. which option could he use?

1. -define adaptation2 explain darwin's theories of descent with modification and natural selection in detail3. -explain how each of these provides evidence for evolution: a. -fossil record, including superposition and transitional fossilsb-anatomy, including homologous structuresc-biological molecules, including dna and proteins4. -explain the difference between convergent and divergent evolution.5. -define and give three examples of artificial selection6. -define and give one example of coevolution.7. -explain biodiversity and how it benefits humans.8. -explain a type of population lest affected by environmental change.

Which kind of mutation has occurred when the codon for an amino acid is changed to a stop codon? a. a silent mutation b. a missense mutation c. a frameshift mutation d. a nonsense mutation