生物正交化学能在活体里做什么？
What can bioorthogonal chemistry do in living systems?
用不与生物体系反应的反应（如无铜点击）在细胞或动物体内定点标记分子，用于成像与递送。
Reactions that do not perturb biology (e.g., copper-free click) label molecules in cells or animals for imaging and delivery.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Madonna M. A. Mitry, Francesca Greco, Helen M. I. Osborn,《In Vivo Applications of Bioorthogonal Reactions: Chemistry and Targeting Mechanisms》,Chemistry - A European Journal,2023 (DOI: 10.1002/chem.202203942)
Madonna M. A. Mitry, Francesca Greco, Helen M. I. Osborn, 'In Vivo Applications of Bioorthogonal Reactions: Chemistry and Targeting Mechanisms', Chemistry - A European Journal, 2023, DOI: 10.1002/chem.202203942
独立核验依据 · Independent verification: 核验依据 1 OpenAlex W4317434403 (DOI 10.1002/chem.202203942)
#生物正交 #标记 #活体
为什么有机磷农药中毒会抽搐？
Why does organophosphate poisoning cause convulsions?
有机磷抑制乙酰胆碱酯酶，神经递质乙酰胆碱无法被清除，在突触堆积，使肌肉持续兴奋甚至抽搐；解药常用阿托品、解磷定。
Organophosphates inhibit acetylcholinesterase, so acetylcholine accumulates at synapses, over-stimulating muscles (convulsions); atropine and pralidoxime are antidotes.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#有机磷 #胆碱酯酶 #中毒
为什么A型、B型、O型血彼此不同？
Why are type A, B and O blood different?
红细胞表面糖链末端糖不同：A型加N-乙酰半乳糖胺，B型加半乳糖，O型末端糖最少（只到前体）；这层糖衣决定血型抗原。
Red-cell surface glycans differ at the terminal sugar: A adds N-acetylgalactosamine, B adds galactose, O has the least (precursor only)—these sugar decorations define blood-group antigens.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#血型 #糖链 #抗原
血液为什么是红色的？
Why is blood red?
血液的红来自血红素：亚铁离子坐在卟啉四个吡咯氮围成的平面中心，这套共轭体系把强吸收带压在蓝紫到蓝绿光区，蓝光被吸走，透出的便是红光。氧结合到铁上会改变配位场与卟啉的电子结构，于是氧合血亮红、缺氧血暗红——动脉与静脉的色差由此而来。至于静脉发蓝是错觉：血只是变暗，青紫来自皮肤对光的滤过；血浆本身近乎淡黄。
Blood is red because of heme: an iron(II) ion sits in the flat centre held by the four pyrrole nitrogens of the porphyrin, and this conjugated system absorbs strongly from the blue-violet into the blue-green, so the blue is taken out and what comes through is red. Adding oxygen to the iron changes its ligand field and the electronic structure of the porphyrin, which is why oxygenated blood is bright red and oxygen-poor blood dark red; that is the difference between arterial and venous colour. That veins "look blue" is an illusion - the blood has only darkened, and the bluish cast comes from light filtering through skin; plasma itself is nearly pale yellow.
难度 专业 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#血液 #血红蛋白 #颜色
为什么DNA两链既能分开又能准确配对？
Why can DNA strands separate yet pair accurately?
碱基靠氢键配对（A-T两键、G-C三键），氢键较弱，加热可解旋复制，又保证配对专一，维持遗传信息。
Base pairs are held by hydrogen bonds (A-T two, G-C three). Weak enough to unzip for replication, specific enough to encode genetic info.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#DNA #氢键 #碱基配对
咖啡因为什么能让人提神？
Why does caffeine keep you awake?
腺苷是清醒时在大脑里不断累积的信号，一坐上腺苷受体就压低觉醒神经元、催促入睡。咖啡因与腺苷同属甲基黄嘌呤、形状相近，于是抢先占住受体的位子却不按下开关，把腺苷挡在门外，困意信号传不进去。它是拮抗剂而不是燃料，并不减少腺苷，只是让受体收不到。这占位可逆，咖啡因被代谢后积压的腺苷照样生效，人就突然困倒；长期摄入还让受体数目上调，带来耐受与停喝后的头痛。
Adenosine is a signal that piles up in the brain through the waking hours, and once it sits on an adenosine receptor it damps the arousal neurons and pushes you toward sleep. Caffeine is a methylxanthine like adenosine and close enough in shape to take the seat on the receptor first without switching it on, shutting adenosine out so the drowsiness signal never lands. It is an antagonist, not a fuel: it does not reduce the adenosine, it only keeps the receptor from receiving it. That occupation is reversible, so the adenosine that has built up lands as soon as the caffeine is metabolized and the sleepiness crashes in; with regular intake the number of receptors is also upregulated, which is where tolerance and the headache after stopping come from.
难度 专业 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#咖啡因 #腺苷 #神经
淤青为什么会从紫红变成青绿再变黄？
Why do bruises change from purple-red to greenish then yellow?
皮下血红蛋白里的铁被逐步分解，先变成蓝绿色的胆绿素，再变成黄色的胆红素，最后被身体吸收。
Subcutaneous hemoglobin iron is broken down stepwise into blue-green biliverdin, then yellow bilirubin, before being absorbed.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#淤青 #血红素 #分解
为什么水母能帮科学家看见细胞？
Why can a jellyfish help scientists see cells?
下村脩从水母中分离出绿色荧光蛋白GFP，经改造可作活体荧光标记，让研究者实时观察蛋白质与细胞，获2008诺奖。
Osamu Shimomura isolated green fluorescent protein (GFP) from jellyfish; engineered GFP tags let scientists watch proteins/cells live, earning the 2008 Nobel.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#绿色荧光蛋白 #下村脩 #标记
为什么 ATP 被称为能量货币？
Why is ATP called energy currency?
ATP 末端的三磷酸链上负电荷彼此排斥；水解成 ADP 与磷酸根后排斥解除、产物溶剂化更好，自由能下降，这才是细胞支取的能量。它叫货币是因为既不存能也不干活，只居中介：氧化燃料供能把 ADP 再磷酸化，ATP 再交出磷酸基团推动运输、运动和合成。但要注意断键只吸热，「高能键放能」是简写；它也不是储备，只够几秒剧烈活动。
The negative charges on ATP's triphosphate tail repel one another; hydrolyzing it to ADP and phosphate relieves that repulsion and leaves the products better solvated, so free energy drops, and that drop is what a cell spends. It is a currency because it neither stores energy nor does work, sitting in the middle instead: energy from oxidizing fuel re-phosphorylates ADP, and ATP hands a phosphate group onward to drive transport, motion and synthesis. Breaking any bond only absorbs heat, so "the high-energy bond releases energy" is shorthand for more stable products, and ATP is no reserve—it covers seconds of hard work.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#ATP #磷酸键 #能量
喝酒上脸、易醉和哪种酶有关？
Which enzymes explain flushed faces and quick intoxication from alcohol?
乙醇先被乙醇脱氢酶（ADH）变成乙醛，再靠乙醛脱氢酶（ALDH2）分解；很多人ALDH2活性低，乙醛堆积就会脸红、心悸。
Alcohol is converted by ADH to acetaldehyde, then by ALDH2; many people have low ALDH2, so acetaldehyde builds up, causing flushing and palpitations.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#酒精 #乙醛 #酶
为什么仙人掌白天不张开气孔？
Why doesn't a cactus open its stomata during the day?
仙人掌是CAM植物，夜间开孔吸二氧化碳存成有机酸，白天关孔减少水分蒸发，再用储存的二氧化碳进行光合，适应干旱。
Cacti are CAM plants: they open stomata at night to fix CO2 into acids, close by day to save water, and use the stored CO2 for photosynthesis—drought adaptation.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#仙人掌 #CAM #气孔
为什么维生素C是抗氧化剂？
Why is vitamin C an antioxidant?
维C易失去电子，抢先中和有害的自由基，保护细胞。
Vitamin C donates electrons to neutralize harmful free radicals, protecting cells.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#维生素C #抗氧化 #自由基
为什么治糖尿病的胰岛素要打针不能口服？
Why must insulin be injected rather than taken by mouth?
胰岛素是蛋白质，若口服会被胃肠道的消化酶分解成氨基酸而失效，所以只能注射进入血液。
Insulin is a protein; taken orally it would be digested by GI enzymes into amino acids and lose activity, so it must be injected.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#胰岛素 #蛋白质 #口服
萤火虫发光的化学原理是什么？
What is the chemical basis of firefly luminescence?
萤火虫的光来自化学发光：荧光素酶催化荧光素与氧气反应，生成处于激发态的氧化荧光素，这个分子回到基态时放出约550到580纳米的黄绿色光。反应几乎不产生热量，被称为冷光，能量转换效率非常高。
Firefly light comes from chemiluminescence: the enzyme luciferase catalyzes luciferin reacting with oxygen to form excited oxyluciferin, which emits yellow-green light around 550-580 nanometers as it returns to the ground state. The reaction produces almost no heat - it is cold light - and converts chemical energy into light with remarkable efficiency.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#化学发光 #荧光素 #酶催化
肽键是怎样形成的？为什么有平面性？
How does a peptide bond form, and why is it planar?
氨基酸的羧基与另一氨基酸的氨基脱水缩合形成酰胺键（—CO—NH—）。由于共振，C—N 具部分双键特征，使肽单元呈刚性平面、不能自由旋转，这是蛋白质二级结构的基础。
Amino acid carboxyl and amino groups condense with loss of water to form an amide linkage (—CO—NH—). Resonance gives the C—N bond partial double-bond character, making the peptide unit a rigid planar group that cannot rotate freely—the basis of protein secondary structure.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#肽键 #蛋白质 #共振
酶作为催化剂与无机催化剂有何不同？
How do enzyme catalysts differ from inorganic catalysts?
酶是高度专一的生物大分子，在温和条件下通过降低活化能极大加速反应，并受底物结构、pH、温度与抑制剂调控；无机催化剂通常作用较广、条件更剧烈且易失活性较低。
Enzymes are highly specific biomacromolecules that, under mild conditions, greatly accelerate reactions by lowering activation energy and are regulated by substrate structure, pH, temperature, and inhibitors; inorganic catalysts are generally broader, harsher, and less prone to denaturation.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#酶 #催化 #专一性
为什么发烧或高温会让酶失效？
Why do fever or high heat make enzymes stop working?
高温破坏酶(蛋白质)的折叠结构，活性中心变形就再也“抓不住”底物，催化能力随之丧失。
Heat disrupts the folded protein structure; the misshapen active site can no longer bind substrate, so catalysis fails.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#酶 #变性 #温度
为什么蛋白质加热会变性？
Why does heat denature proteins?
高温破坏维系蛋白质形状的非共价键，使其失去功能。
Heat breaks the non-covalent forces that hold a protein's shape, disabling it.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#蛋白质 #变性 #高温
为什么很多东亚人喝酒容易脸红？
Why do many East Asians flush red when drinking alcohol?
乙醛脱氢酶ALDH2基因缺陷在东亚常见，酒精代谢出的乙醛堆积，使血管扩张脸红，也提升致癌风险。
A common East Asian ALDH2 gene variant impairs acetaldehyde breakdown, causing acetaldehyde buildup, flushing, and higher cancer risk.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#酒精脸红 #乙醛 #基因
为什么血红蛋白能携带氧气？
Why can hemoglobin carry oxygen?
血红蛋白里的铁(血红素)能可逆地结合和释放氧分子。
Iron in heme reversibly binds and releases oxygen molecules.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#血红蛋白 #铁 #携氧
为什么有些人喝牛奶会腹胀腹泻？
Why do some people get bloating and diarrhea from milk?
这些人缺乳糖酶，乳糖进入大肠被细菌发酵产气产酸，引起腹胀腹泻；不少东亚成年人乳糖酶本就偏低。
They lack lactase; undigested lactose is fermented by gut bacteria, producing gas and acid—bloating and diarrhea. Many East Asian adults have low lactase.
难度 进阶 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#乳糖 #乳糖酶 #消化
酶为什么像“一把钥匙开一把锁”？
Why is an enzyme like ‘a key for one lock’?
酶的活性中心形状刚好匹配特定底物，只催化一种或一类反应，这就是酶的专一性；后来发现还会“诱导契合”微调。
An enzyme’s active site fits one specific substrate, catalyzing just one reaction type—its specificity (later refined as induced fit).
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#酶 #专一性 #活性中心
为什么双氧水涂伤口会冒白泡？
Why does hydrogen peroxide foam on a wound?
伤口组织含过氧化氢酶，把双氧水（H2O2）迅速分解成水和氧气产生泡沫，同时氧气和强氧化有助杀菌。
Tissue catalase rapidly decomposes H2O2 into water and oxygen, foaming; the oxygen and oxidation also help kill germs.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#双氧水 #过氧化氢酶 #分解
为什么生鸡蛋煮熟后蛋黄蛋白会变硬？
Why do egg white and yolk turn solid when cooked?
鸡蛋里的蛋白质受热后会松开再重新抱成一团，就从软软的变成硬硬的。这个过程叫变性，温度越高变得越快，煮久了蛋黄还会变灰绿。
Egg proteins unfold with heat and then clump together, changing from soft to firm. This is called denaturation; the hotter it gets the faster it happens, and overcooking can even turn the yolk gray-green.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#鸡蛋 #蛋白质 #加热
蛋白质变性是什么意思？
What does protein denaturation mean?
变性是蛋白质的三维空间结构（二级及以上）被热、酸、酒精或机械作用破坏，失去生物活性，但一级肽链通常不断裂。例如煮蛋时蛋清由透明变白凝固就是变性。
Denaturation is the disruption of a protein's 3D structure (secondary and above) by heat, acid, alcohol, or agitation, losing biological activity while the primary peptide chain usually stays intact. Boiling an egg, where clear albumin turns white and solid, is denaturation.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#变性 #蛋白质 #结构