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英語 高校生

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4 20 科学 420 words Chapter 1 The recipe for making any creature is written in its DNA. So last year, when 1-1 geneticists* published the near-complete DNA sequence of the long-extinct woolly mammoth, there was much speculation about whether we could bring this giant creature back to life. 5 東京理科大学 Creating a living, breathing creature from a genome* sequence that exists only in a computer's memory is not possible right now. But someone someday is sure to try it, predicts Stephan Schuster, a molecular biologist at Pennsylvania State University and a driving force behind the mammoth genome project. So besides the mammoth, what other extinct beasts might we bring back to life? Well, 12 10 it is only going to be possible with creatures for which we can recover a complete genome Without one, there is no chance. And usually when a creature dies, the (1) - DNA in any flesh left untouched is soon destroyed as it is attacked by sunshine and bacteria. sequence. There are, however, some circumstances in which DNA can be preserved. If your 15 specimen froze to death in an icy wasteland such as Siberia, or died in a dark cave or a really dry region, for instance, then the probability of finding some intact stretches of DNA is much higher. Even in ideal conditions, though, no genetic information is likely to survive more than a million years. - so dinosaurs are out and only much younger remains are likely to yield good-quality DNA. "It's really only worth studying specimens that are less than 100,000 years old," says Schuster. The genomes of several extinct species besides the mammoth are already being sequenced, but turning these into living creatures will not be easy. "It's hard to say that something will never ever be possible," says Svante Pääbo of the Max Planck Institute 25 for Evolutionary Anthropology in Germany, "but it would require technologies so far removed from what we currently have that I cannot imagine how it would be done." But then (3) 50 years ago, who would have believed we would now be able to read the instructions for making humans, fix inherited diseases, clone mammals and be close to creating artificial life? Assuming that we will develop the necessary technology, we have 30 selected ten extinct creatures that might one day be resurrected. Our choice is based not just on practicality, but also on each animal's "charisma" - just how exciting the prospect of resurrecting these animals is. 1-3

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英語 高校生

黄色のマーカーが引いてあるところが理解できません。 なぜ異なる2個の実数解を持つのは-1<t<1の範囲でただ一つの解を持つときになるのでしょうか?

Key 関数 f(0)= sin30+ (0≤0 <2π) について (1) cos20=ア ウ ]sin²0, sin30= ■力 |t² - # sin0 + in であるから, t = sin0 とおいて(0) を用い て表すと, S(0)=オド となる。 また,002 であるから,t の値の範囲はケコ SIS サである。 したがって,S (0) は 0 = または 0 = Key 1 30000 cos20-5sin0 + 2 [ヌネ (2) 方程式f(0)=k0 ≦0 <2mの範囲で異なる2個の実数解をもつとき,定数kの値の範囲はん= [ハヒ くんくフである。 解答 セソ タ のとき, 最小値 ナニをとる。 =(1) 24- 1 (1) f(0) - sin30 + cos 20-5sin0 + 2 2倍角の公式により また t= のとき, 最大値 5 2 k = sin 30= sin(0+20) cos20=1-2sin20 よって, t = sin とおくと 5 __10_b.__ƒ (0) = − (3t − 4t³) + 2 (1 -(1-2t²)-5t+ = 4t-5t2-8t+3 また、 0≦0 <2π より -1≦t≦1 ここで,g(t)=4t° -5t2 -8t+3 とおくと g'(t)=12t2-10t-8 (大)の = 2(2t+1)(3t-4) 1≦t≦1において, g(t) の 増減表は右のようになる。 よって, g(t) は = sin Acos20 + cos0sin 20 = sin0(1-2sin²0) + cos0.2sin Acoso = sin0 - 2sin³0 +2sin0(1-sin²0) = x 5) (3) = 3sin0-4sin'0 [チツ] テ 2 (1-x)(ES+81-AE) = (01-ES se s £5M($+381 - 57 1815 181 +38-=8 t D)g' (t) または-6<ん<2 -1 ... + Ad@cos 20 = cos²0-sin²0 =1-2sin²0 =2cos20-1 加法定理を利用する。 g(t) 2 7 TOOGUN STE 7 11 すなわち 0 = π, πのとき 最大値 2 6 6 1 19 2 0 21 4 21 4 ... - €39(t)4 1 21 sino のみの式で表す。 -6 π t = 1 すなわち 0 = のとき 最小値 6 2 (2) 方程式f(0)=hが0≦0<2πの範囲で異なる2個の実数解をも つのは,t の方程式 g(t)=hが-1<t<1の範囲でただ1つの解を もつときである。よって, グラフより 求める定数の値の範囲は 21 2011 4 (8-4) 10-381 +10 tの3次関数となる。 2634 21 4 O または (1) = ±1 のとき, 0 の値は1つ t である。 よ

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英語 高校生

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助動詞(助動調+完了形) Figure 1 shows the average monthly high and low temperatures in London. As you It always rains in London. Gyou might have heard this before, but git does, e 天気·気候 * UNIT 3 O Track 12-13 Reading all year round; even in winter it's more rainy than snowy. 3 temperature at which water starts freezing. the Usually, locations closer to (°C)25 In High *North or South Pole are colder. 20 10 other words, if you are nearer to either 15 of the poles, you receive less sunlight Low 10 because the angle of the sun is lower. But then 。Why is London warmer than 51 3 any city in Hokkaido? When you look 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dee 15 at a world map, you will notice that Figure 1. London Temperatures(°C) Average Daily High & Low by Month London is much closer to the North Pole than *Cape Soya is. Cape Soya is the most northerly point of the island of Hokkaido, and its average low temperature in( 2 )is -4°℃. 20 The answer to this question is a warm ocean current that flows northeast across 13 the Atlantic and brings warmth towards the *British Isles. The current called the *North Atlantic Drift carries warm water from the tropics and makes the British climate milder than that of another area farther south but not touched by the current. What about the summer weather in London? July is one of the hottest months 5 with an average high of around 22°C. Because the daily high temperature rarely rises above 30C, some hotels in London are not equipped with air conditioning. So, if it is very hot and you've found your hotel room has no air conditioning, you might think, G I should have checked this before reserving the room.” (302 words) *North(South] Pole 北極[南極] Cape Soya 宗谷岬 British Isles イギリス諸島 North Atlantic Drift 北大西洋海流 2|

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