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生物 高校生

生物基礎です! 緑マークしたとこって、なぜ÷2するのでしょうか?

演習問題 52 [DNA・RNAの塩基組成] (p.52) 解答 問 1.⑧ 問2.⑥ 問 3.③ 問4.⑤ リード文 Check 次の文章を読み, 下の問いに答えよ。 A あるmRNAについて, これを構成する4種の塩基の分子数の割 合 (塩基組成) を調べたところ アデニン (A) が20%, グアニン (G) とシトシン (C) がいずれも22%であった。 このmRNAを転写した 元のDNA鎖を鋳型となったDNAといい、このmRNAと同数の 塩基が含まれているものとする。 問5.④ ベストフィット AmRNAは1本鎖なので, ウラ シルの割合は100% からアデニ ン,グアニン、シトシンのそれ ぞれの割合を引いて求められる。 回鋳型となったDNAの塩基組 成は, A (36%), T (20%), G (22 %), C (22%) となる。 BA 正 Check 問1鋳型となったDNAの塩基組成のうち, アデニンの割合として最も適当なものを、次の①~ ⑩ のうちから一つ選べ。 1.0% 4 22 % 5 25 % 628% ② 20% ③ 21% ⑦ 30% (8) 36% 940 % ⑩ 42% 11 50% 12 56% mRNAの塩基は,A (20%), G (22%), C (22%)なので, U(ウラシル) は, 100- (20 + 22 + 22) = 36%となる。鋳型となったDNAのA (アデニン)は,mRNAのUと相補的に結びつくので,36%とな る。 したがって, ⑧が正しい。 問2 鋳型となったDNAが相補的なDNAと2本鎖を形成したとすると,この2本鎖DNAの塩基 組成のうち,アデニンの割合として最も適当なものを、問1の①〜⑩のうちから一つ選べ。 ①0% (2) 20% (5) 25 % 628% ③ 21% 940 % ④ 22% d 10 42% ⑦ 30% Ace 1 50% 36% 1⑩2 56% The TELE 鋳型となったDNAの塩基組成は,A (36%), G (22%), C (22%), T (20%) となる。 したがって、 相補的なDNAの塩基組成は,A (20%) G (22%), C (22%), T (36%) となる。 この2本鎖DNAの A (アデニン)の割合は, (20+36) 2= 28%となる。したがって, ⑥が正しい。 問3 問2の2本鎖DNAの塩基組成について, (A + G) / (T+C) の値はいくらか。 最も適当なも のを次の①~⑥のうちから一つ選べ。 ⑥ 1.3 ① 0.8 ② 0.9 ③③ 1.0 ④ 1.1 ⑤ 1.2 TRAN 問2の2本鎖DNAに限らず,すべての2本鎖DNAでは「Aの割合=Tの割合」, 「Gの割合=Cの 「割合」なので, (A + G) / (T+C) = (A + G) / (A + G) = 1 となる。 問4 このmRNAのある領域Xでの塩基配列が 「AUGCU」であることがわかった。領域Xの鋳型 となったDNAの塩基配列として最も適当なものを、次の①~⑥のうちから一つ選べ。 ① ATGCT ② AUGCU 3 CGATG ④ GCTAC ⑥⑤ TACGA 6 UACGU 「mRNAの塩基→鋳型のDNA」で表すと,「A→T」「U→A」 「G→C」 「C→G」 「U→A」となる から ⑤ の TACGAが正しい。 AA

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英語 高校生

VISTAのこの問題の答え教えて欲しいです🙇‍♀️

C )内の単語を必要なら形を変えて、英文を完成させよう。 Ppp.1410 5文法)( 1. Today, Tokyo is Words & Phrases ヒント as Dubai. (hot / as ) →教科書 p.18 1. Dubai「ドバ 1語句それぞれの意味を書いてみよう。 1. familiar 圏 2. Your bicycle is mine. (light /1than) than that one. (useful ) イ」 2. countryside 図 3. This book is 2. mine「私のも 4. literature 図 の」 4. My mother gets up the in our family. (early) 3. useful「役に 3. million 影 6. common囲 立つ」 5. primary ® 6文法 ]内の単語を使って、対話を完成させよう。 8. isle 図 →教科書 p.18 7. Irish 形 1. A: Kenji isa very swimmer. 10. symbol 図 9. winner図 B: Yes, but Taro can swim Kenji. Vow 25ouK2 2. A: Do you 0ao a 2語句下線部に注意して、英語または日本語を書いてみよう。 1. Ireland is a beautiful country. [ than / fast / faster ] は美しい国です。 come to this restaurant? 本来の計画のほうがいいです。 B: Yes. I think it is restaurant in 2. The plan is better. in many countries. 英語は多くの国々で教えられています。 the city. 3. English is 私たちは昨日 [ the / often /best ] 4. We had lots of fun yesterday. 5. What time does the parade start? は何時に始まりますか? 3. A: I think is more important than 3. agree「同意 B: I can't agree. Money is not as as time. る」 2eiaud en アクセントもっとも強く発音する部分を、○で囲もう。 [ time / money/important] mon yote, ia, 3. sym-bol ア 1. fa-mil-iar 2. lit-er-a-ture 4. A: I think SOCcer is the sport. 4. in my opir 「私の意見 アイウ アイウ エ B: In my opinion, baseball is exciting as soccer. 4. pri-ma-ry 5. mil-lion 6. coun-try-side アイウ」 は」 [as/ most / exciting ] アイウ アイ 4発音下線部の発音が同じものには○、違うものには× をつけよう。 7表現 日本語の意味に合うように、英文を完成させよう。 1.彼はコンピュータのことをよく知っています。 1. shamrock -national ( ) 2. symbol - time ( 1. →教科書 3. primary - million ( He is computers. 2.あなたのアイデアと私のには共通点がたくさんあります。 5. isle - countryside ( 4. winner - literature ( へ tor へ 6. emerald - everybody () 2. →教科書 Your idea and mine have alot 3. あの国は石油由に恵まれています。 3. →教科書 That country is oil. more 4. テーブルの上に何か緑色のものが見えます。 ablo hodit foe 4. →教科 Toenotaia o を用しる T anala be I can see on the table.

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英語 高校生

広島大学の二次試験対策について質問です。 去年から新しく2個の資料から問題を解く形式に変わりました。慣れるために問題を解きたいんですが、去年の分しかありません(TT) 2個の資料を用いて問題を解いていく形式の長文がある大学の過去問を知っていたら、教えて欲しいです! ↓写真... 続きを読む

(I] Read the following two passages and answer the questions. 資料1 A cave-wall depiction of a pig and buffalo hunt is the world's oldest recorded story, claim archaeologists who discovered the work on the Indonesian island Sulawesi. The scientists say the scene is more than 44,000 years old. The 4.5-metre-long panel features reddish-brown forms that seem to depict human-like figures hunting local animal species. Previously, rock paintings found in European sites dated to around 14,000 to 21,000 years old were considered to be the world's oldest clearly narrative artworks. The scientists working on the latest find say that the Indonesian art predates these. Such artworks are notoriously difficult to date because they can be made with raw materials, such as charcoal(注1), which can be much older than the paintings themselves. But scientists excited the archaeological worid when they reported, in 2014 and 2018, that caves in Sulawesi and Borneo held artworks, including animal paintings, which were older than 40,000 years. The panel seems to depict wild pigs found on Sulawesi and a species of small-bodied buffalo, called an anoa. These appear alongside smaller figures that look human but also have animal traits such as tails and long noses. In one section, an anoa is surrounded by several figures holding spears and possibly ropes. The depiction of these animal-human figures, known in mythology as therianthropes (注 2), suggests that early humans in Sulawesi had the ability to conceive of things that do not exist in the natural world, claim 2 the researchers. The oldest such example from Europe is a half-lion, half-human ivory figure from Germany that researchers have estimated to be 40,000 years old-although Some suggest that it might be significantly younger. A roughly 17,000-year-old painting of a bison chasinga bird-headed human, from Lascaux Cave in France, is considered to be one of the earliest depictions of a clear scene in European rock art. To determine the age of the hunting scene, researchers led by archaeologist Maxime Aubert, at Griffith University, Australia, analysed calcite (注 3) 'popcorn' that had built up on the painting. Radioactive uranium in the mineral slowly decays into thorium. So by measuring the relative levels of different isotopes (往0 of these elements, the researchers were able to determine that calcite on top of one pig began forming at least 43,900 years ago, and deposits (注 5) on two anoas are older than 40,900 years. The dating gives scientists clues about the origins of figurative art. "t has always been assumed that the tradition of figurative painting arose in Europe," says Alistair Pike, an archaeological scientist at the University of Southampton, UK. "This shows the tradition does not have its origins in Europe." But he notes that the researchers dated only the portions of the painting that show animals, so it's possible that the therianthropes were added later. Aubert says the team did not find calcite samples over the therianthropes. Aubert thinks the animals and the therianthropes were painted at the same time. They are of similar colour and weathered in the same way, he notes, and all the other cave art from the region is from the same time period. Archacologist Bruno David, at Monash University in Melbourne, Australia, agrees with Aubert's interpretation. If the entire painting is more than 44,000 years olid, it could mean that early humans arrived in southeast Asia with the capacity for symbolic representation and storytelling. David argues. Archaeologists have already found paint palettes and objects such as eggshells with abstract engravings made by early humans in southern Africa, he adds. “'s probably only a matter of time before narrative paintings of this, and much older age, are found in Africa." (Adapted from Nature, December 11, 2019) (注1) charcoal 木炭 (注2) therianthrope 獣人 (注3) calcite 方解石 (注4) isotope 同位体 (注5) deposit 付着物

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