什么是“嗜盐菌”，它们的细胞膜为什么是紫色的？
What are halophiles, and why is their cell membrane purple?
嗜盐古菌生活在极高盐度的盐湖或盐场，靠一种叫细菌视紫红质的蛋白把阳光直接转成能量，不用叶绿素。大量这种蛋白让它们的细胞膜呈紫红色，并能制造ATP。这是除光合作用外的另一种光获能方式。
Halophilic archaea live in very salty lakes or salterns and use a protein called bacteriorhodopsin to turn sunlight directly into energy without chlorophyll. Crowds of this protein tint their membranes purple-red and make ATP. It is an alternative light-energy strategy to photosynthesis.
难度 专业 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Nick Lane,《The Vital Question》Profile Books,2015
Nick Lane, The Vital Question, Profile Books, 2015
#嗜盐菌 #视紫红质 #盐湖
科幻里的“硅基生命”有科学可能吗？
Is 'silicon-based life' from science fiction scientifically plausible?
硅和碳同族，理论上能形成复杂分子，但硅-硅键在地球常温常湿下不稳定，且硅氧化物是坚硬的固体难以参与代谢循环。目前没有任何证据存在硅基生命，碳基仍是唯一已知生命形式。相关讨论主要停留在假说层面。
Silicon sits in the same group as carbon and can in principle form complex molecules, but silicon-silicon bonds are unstable under Earth's mild, wet conditions, and silicon oxides are hard solids that do not lend themselves to metabolism. There is no evidence for silicon life; carbon-based remains the only known form. The idea stays hypothetical.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：本题原挂出处与答案内容不符，已撤回；具体书目待补，暂不展示来源。
本题原挂出处与答案内容不符，已撤回；具体书目待补。
Previous citation withdrawn as unsupported for this answer; a specific source is pending.
#硅基生命 #外星生命 #假说
趋磁细菌为什么体内有“指南针”？
Why do magnetotactic bacteria have an internal 'compass'?
趋磁细菌合成链状磁小体（磁铁矿），像内置罗盘使其沿地磁场游向缺氧但营养合适的沉积物深处，是生物矿化的精巧例子。
Magnetotactic bacteria build chains of magnetite 'magnetosomes' acting as a compass, letting them swim along Earth's field to low-oxygen, nutrient-rich sediments—a neat case of biomineralization.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Urry 等,《Campbell Biology》第11版,Pearson,2017
L. A. Urry et al., Campbell Biology, 11th ed., Pearson, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-0-13-409341-3 (11th ed., Pearson)
#趋磁细菌 #磁小体 #生物矿化
什么是“嗜压菌”，深海高压下怎么不被压扁？
What are piezophiles, and why aren't they crushed by deep-sea pressure?
嗜压菌生活在数千米深海，靠含不饱和脂肪酸的细胞膜和特殊蛋白质维持结构稳定，并且体内外压力平衡、没有气腔可被压缩。它们把高压当作正常环境，到了常压反而难以存活。
Piezophiles live kilometers deep and keep stable structures via unsaturated-fat membranes and special proteins; their internal and external pressures balance with no compressible gas spaces. They treat high pressure as normal and often struggle at surface pressure.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Nick Lane,《The Vital Question》Profile Books,2015
Nick Lane, The Vital Question, Profile Books, 2015
#嗜压菌 #深海 #压力适应
什么是“嗜酸菌”，它们不怕强酸吗？
What are acidophiles, and are they not afraid of strong acid?
嗜酸微生物能在pH接近0到3的环境里生长，比如酸性矿坑和火山湖。它们靠把内部pH维持在接近中性、并拥有耐酸酶和特殊泵来抵御外部强酸。有些还能从硫和铁的化学反应中获利。
Acidophilic microbes grow at pH near 0 to 3, such as in acid mine drainage and volcanic lakes. They keep their internal pH near neutral and rely on acid-stable enzymes and special pumps to fend off external acid. Some profit from chemical reactions of sulfur and iron.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Nick Lane,《The Vital Question》Profile Books,2015
Nick Lane, The Vital Question, Profile Books, 2015
#嗜酸菌 #低pH #酸性环境
有种细菌能在核辐射里活得好好的，是真的吗？
Is there a bacterium that thrives under nuclear radiation?
耐辐射奇球菌能在高强度电离辐射下存活，因为它有超强DNA修复能力和致密的蛋白质保护。它常出现在消毒过的食物和医疗设备表面，是研究辐射抗性的明星物种。不过它“耐辐射”而非“靠辐射生活”。
Deinococcus radiodurans survives intense ionizing radiation thanks to superb DNA repair and dense protein protection. It shows up on sterilized food and medical equipment surfaces and is a star for radiation-resistance study. But it tolerates radiation rather than living off it.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Cox 与 Battista 解析耐辐射奇球菌生存机制的综述,《Nature Reviews Microbiology》2005年第3卷第882页。
Cox MM & Battista JR, Deinococcus radiodurans—the consummate survivor, Nature Reviews Microbiology 3: 882 (2005).
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1038/nrmicro1264：Deinococcus radiodurans
#耐辐射菌 #DNA修复 #奇球菌
嗜热菌为什么能在滚烫的环境里生存？
Why can thermophiles survive in boiling environments?
嗜热菌的膜含饱和与分支脂肪酸更稳固，蛋白质与DNA结合蛋白也适应高温，使它们能在温泉、海底热泉等近沸点环境中繁茂。
Thermophiles have stabilized membranes with saturated, branched fats and heat-adapted proteins and DNA-binding proteins, thriving in hot springs and vents near boiling point.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Urry 等,《Campbell Biology》第11版,Pearson,2017
L. A. Urry et al., Campbell Biology, 11th ed., Pearson, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-0-13-409341-3 (11th ed., Pearson)
#嗜热菌 #高温 #热泉
深海热泉旁的生物靠什么活，没有阳光怎么办？
What do creatures near deep-sea vents live on, with no sunlight?
深海热泉（黑烟囱）喷出的硫化物被化能合成细菌利用，它们靠氧化硫化氢获得能量并制造有机物。管虫、盲虾等再以这些细菌为食或共生，形成不依赖阳光的独特生态系统。
Hydrothermal vents spew sulfides that chemosynthetic bacteria exploit, gaining energy by oxidizing hydrogen sulfide to build organic matter. Tube worms, blind shrimp, and others eat or house these bacteria, forming a sunlight-free ecosystem.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Nick Lane,《The Vital Question》Profile Books,2015
Nick Lane, The Vital Question, Profile Books, 2015
#热泉 #化能合成 #深海生态
仙人掌的刺是它的叶子吗？
Are a cactus's spines actually its leaves?
是的，仙人掌的刺就是高度退化、变硬的叶子，目的是减少水分蒸腾并防御动物啃食。真正的光合作用改由肥厚的茎来完成。所以刺虽不起眼，却是仙人掌省水的关键发明。
Yes, cactus spines are highly reduced, hardened leaves, meant to cut water loss and deter browsers. Photosynthesis is handed to the thick stem. So spines, though inconspicuous, are the cactus's key water-saving invention.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Raven 等,《Biology of Plants》第8版,W. H. Freeman,2013
P. H. Raven et al., Biology of Plants, 8th ed., W. H. Freeman, 2013
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL16626503W：Biology of plants（按标题+
#仙人掌 #刺 #叶退化
为什么温泉里的水是彩色的？
Why is the water in some hot springs colorful?
温泉边缘的七彩颜色常来自成片的嗜热微生物垫，不同温度带长着不同颜色的细菌：绿、黄、橙、红。它们用特殊色素防晒并耐高温，层层铺开就像天然调色板。
The rainbow colors at hot-spring edges often come from mats of thermophilic microbes; each temperature band grows different colored bacteria—green, yellow, orange, red. Their special pigments protect against sunlight and heat, laying out like a natural palette.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Madigan 等，《Brock 微生物生物学》（第15版，Pearson，2018）
Madigan et al., Brock Biology of Microorganisms (15th ed., Pearson, 2018)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL3245844W：Brock biology of microo
#温泉 #嗜热菌 #微生物垫
什么是“水熊虫”，为什么它那么顽强？
What is a 'water bear', and why is it so tough?
水熊虫也叫缓步动物，体长约1毫米，能耐受冰冻、干旱、辐射和太空真空。遇极端环境它会脱水缩成“小桶”进入隐生状态，代谢几乎停止，条件好转再复活。它是已知生命力最强的动物之一。
Tardigrades, or water bears, are about a millimeter long and tolerate freezing, drying, radiation, and space vacuum. In extreme conditions they dehydrate into a shriveled 'tun' and enter cryptobiosis with metabolism nearly stopped, reviving when conditions improve. They are among the toughest animals known.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Møbjerg,《Decoding tardigrade extreme stress tolerance》,Science China Life Sciences,2025 (DOI: 10.1007/s11427-025-2895-8)
Møbjerg, 'Decoding tardigrade extreme stress tolerance', Science China Life Sciences, 2025, DOI: 10.1007/s11427-025-2895-8
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1007/s11427-025-2895-8
#水熊虫 #隐生 #极端耐受
沙漠植物是怎么省水的？
How do desert plants save water?
仙人掌等把叶子变成刺减少蒸腾，把茎变肥厚储存水分，并在夜间开放气孔吸二氧化碳以避免白天失水。有些沙漠植物种子平时休眠，一场雨就能迅速开花结籽。
Cacti turn leaves into spines to cut transpiration, swell their stems to store water, and open stomata at night to take in carbon dioxide, avoiding daytime water loss. Some desert seeds stay dormant and can burst into flower and seed within days after a single rain.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Taiz 与 Zeiger，《植物生理学》（第6版，Sinauer，2010）
Taiz & Zeiger, Plant Physiology (6th ed., Sinauer, 2010)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL1940473W：Plant physiology（首版 199
#仙人掌 #景天酸代谢 #旱生