Why is it critical that the K+ channel activation gate responds slightly more slowly to depolarization than the Na+ channel activation gate?
A. If they showed identical response times, movements of Na+ and K+ ions would cancel out each other's effects on membrane potential changes.
B. If they showed identical response times, movements of Na+ and K+ ions would magnify each other's effects on membrane potential changes, creating dangerously large action potentials.
C. It is not critical and there would be no change in action potential characteristics if this difference in response time did not exist.
A. If they showed identical response times, movements of Na+ and K+ ions would cancel out each other's effects on membrane potential changes.
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Without elephants, African grasslands convert to forests or to shrublands. Which of the following phrases are true statements about the elephant? Check all that apply.
_____ The elephant is a keystone species. _____ If elephants went extinct, other species in the area would be unaffected. _____ Elephants graze on young shrubs and trees. _____ Elephants are the most abundant species on the grassland. _____ Grazing antelope depend on the presence of the elephant. Additional: Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about the concept of keystone species? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
What phenomenon accounts for the appearance of chloroplasts in some unicellular phototrophic eukaryotes?
A) endosymbiosis B) secondary endosymbiosis C) sequencing of chloroplasts' SSU genes D) horizontal gene transfer
What features of charophytes provides evidence for charophytes being the closests relative to land plants?
A. Charophytes possess plasmodesmata. B. Charophytes are the only photosynthetic protists. C. Charophytes are fully terrestrial. D. Charophytes produce seeds and flowers.
Mitosis includes nuclear and cytoplasmic division.
a. true b. false