化学 高校生 9ヶ月前

左はエステル化と呼びますが、右はアミド化と言いますか？

IME + O 000 H エステル説明 1 ester O R₁-C-O-R2 エステル HOOD HD & アミド amide OHHO: A R-C-N-R2 アミド 1水分子が とれるHOOOHO 5000 水分子が (ii) ○○はカルボン酸から R-C-OH H-O-R2 O || R₁-C-OH カルボン酸 アルコールや フェノール類 ませ とれる H H-N-R₂ カルボン酸 アミン 16

化学 高校生 1年以上前

ポリアミドとポリペプチドのちがいって何ですか？ また、3枚目の(イ)はポリペプチドでは正解になりませんか？

1 合成繊維 家庭 Beginning *p.384 A ポリアミド系合成繊維 ポリアミド アミド結合 -NH-CO- をもつ化合物をアミドという。 分子内 amide にアミド結合をくり返しもつポリマーをポリアミ Note polyamide ポリアミドの構造 ドといい,ジアミンとジカルボン酸の縮合重合, あ アミド結合の部分で分子間に 水素結合(p.12) を形成するた るいは環状アミドの開環重合により得られる。 め、強度を示す。 C=O... H-N

英語 高校生 2年以上前

（4）の thisをある語に置き換えるという問題で模範解答はboiling （their potatoes/them）ですが to boil their potatoesではダメですか？

東京 suggesting a risk linked to, cooking some starchy foods in the microwave, including PANAS cereals and root vegetables. nová nayo si lo era When Betty Schwartz, professor of nutritional sciences at the Hebrew University of Jerusalem, saw her students heating jacket potatoes in the microwave on their lunchbreaks, she noticed small crystals inside their potatoes. rob When she analysed them, she found they were high in the chemical acrylamide, which can be a natural by-product of cooking. Schwartz asked her students to boil their potatoes instead, and found that this didn't create acrylamide, which she says forms in higher temperatures in the microwave. all not ber pb This is a concern because animal studies have shown that acrylamide acts as a carcinogen because it interferes with cell's DNA, but evidence in humans is limited. There is some research to suggest that microwaves are more favourable to the growth of acrylamide than other methods of cooking. "At 100°C (212°F), there's enough energy to alter the automatic joints between molecules to produce a molecule with much higher energy, which can react with DNA, which induces mutations," says Schwartz. "When you have many mutations it can produce cancer." Animal studies have shown this to be the case with acrylamides. 英語 9 the microwave. One way around this is to soak the potatoes in water before putting them in db.cl tenia ng berig adi wad 14 nos

英語 高校生 約5年前

答え4だったのですが何故ですか？

たo/@Ve/ YOの bee ]ast 200 years, people have begun to live longer and longer. This trend more_economnically developed countries。and for some time there Was a growng gap _between_the average_length of jife in rich countries and poor countries/Oyer the Dast few decades、however。 many Poor countries have also made improvements and they are now close to catching up with the wealthier ones. As a result every year there is a 8rowing number of older people in countries all over the world. It is a good thing that people are living longer, but it does have some diffcult aSpects. One of these is that more and more people are suffering from diseases aSsociated with getting older. The number of cases of high blood pressure, heart disease, cancer, and other inesses is increasing, In Australia, for instance。 a recent report said fhat people, on average, live 25 years longer than fhey did a hundred years ago.| Now, there are many more people suffering from serious illnessesOne consequence 3S that each year countries have to spend more and more on medical care foOr Older People. 4 IMany governments have begun to promote healthier lifestyles fo young people, such as losing weight and exercising regularly。as a Way to preventiSerious illnesses、 However as the body gets older, even people who haw have lived healthily are Hikely to become 井. Recentiy。research has begun 10 shoW that 了 this is the result of people's DNA gsetting older. When DNA breaks down, Important iR to control the body's functions is lost. Eventually, serious imesses mmay OCCUT However, David Sinclair,a researcher at the University oNew South Wales im Australia,、 is working on a way to keep DNA healthy。 He used a chemical called nicotinamide mononucleotide (NMN) to see 辻 he could reduce the efects of age on mice. Mice thaf were given NMN became stronger and healthier than they, had been Showing that the chemical was effective./He believes that one day this Lco both longer and make a medicine_for_hunaans. In this Way, Old people may be able to 1 healfhier lives.