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八 、In 1888, German agricultural chemists Hermann Hellriegel and Hermann Wilfarth discovered that root nodules can convert nitrogen from the air into ammonia. Root nodules are specialized structures formed by leguminous plants to facilitate nitrogen fixation by nitrogen-fixing bacteria. Certain species of cyanobacteria, such as Anabaena spp.(念珠藻), can also perform nitrogen fixation, but they do so through heterocysts instead of forming root nodules. As a result, cyanobacteria like Anabaena can carry out nitrogen fixation independently and live autonomously. (1) Why do symbiotic rhizobium bacteria in legumes' roots need to carry out nitrogen fixation? (2) Why can heterocysts of cyanobacteria perform nitrogen fixation independently? 10%
t ㆍWater can diffuse across the lipid bilayer membrane via simple diffusion and facilitate diffusion. Is the movement of water with facilitate diffusion always faster than that with simple diffusion? Yes, or not? And describe the mechanisms.10%
六ㆍPlease describe the differences between "action potential" and ''nerve impulse". And try to design a plan using proper statements and sketch draws for high school students. 10% m3m4
319. A company is marketing an investment opportunity to four potential customers. The company believes that its probability of making a sale is 0.7 for each of the first three customers but that it is only 0.2 for the fourth customer. The customers' purchases are independent of one another. Calculate the probability that at most two customers purchase the investment. (A) 0.18 (B) 0.39 (C) 0.57 (D) 0.71 (E) 0.82
318. Data on a certain pregnancy test show that a pregnant woman will test negative or not pregnant 10% of the time, while a non-pregnant woman will test positive 20% of the time. Thirty percent of the women who take the test are pregnant. Calculate the probability that a woman is pregnant given that her test outcome is positive. (A) 0.18 (B) 0.30 (C) 0.66 (D) 0.82 (E) 0.90
317. A five-year term insurance policy pays 25,000 if the insured dies in the first year. The benefit declines by 5000 per year for each of the next four years. In each of the five years covered by the policy, the probability of dying is 0.01, given that the insured is alive at the beginning of that year. Calculate the expected benefit the insurance company will pay during the five-year term. (A) 692 (B) 740 (C) 750 (D) 985 (E) 1225
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