The action potential in a neuron is an all-or-nothing event.
Answer the following statement true (T) or false (F)
True
Once the threshold is reached, the action potential happens automatically and completely. If the threshold voltage is never reached, the action potential does not occur.
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Manta rays, sting rays, and eagle rays are similar to lampreys in that they have cartilaginous skeletons. How are they different from lampreys?
A. They have closed circulatory systems. B. They have gills. C. They have jaws. D. They have bony fin lobes. 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 evolution of the jaw? 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?
Evolutionary biologists believe that females prefer attractive mates mainly because ____
a. attractive mates confer status in hierarchical societies b. attractiveness is a predictor of good performance and survivorship c. ornaments such as bright plumage stimulate her visual system d. superior ornaments deter rival males e. a sense of aesthetics is shared by both higher animals and humans
The cell cycle of a typical somatic cell consists of __________ and M phase
a. interphase b. meiosis I c. crossing-over d. meiosis II e. mitosis
Patients with severe bacterial sepsis who develop a fever have higher survival rates than patients with severe bacterial sepsis who do not develop a fever
Does this observation provide causative evidence for the beneficial role of fever in fighting infections? a. Yes, patients who develop a fever will have a higher mean fitness. b. Yes, developing a fever is correlated with a strong immune system. c. No, the disease in nonfever patients may have been too severe to allow the body to develop a fever. d. No, fever has been shown by other studies to be inconsequential in fighting infections.