Testing and ThinkingAn adult human is composed of about 1013 cells.all of which are derived by cell division froma singlefertilized egg1.Assumingthat all cells continueto divide(likebacteria in rich media), how many generations ofcell divisions would be required to produce 1013cells?2. Human cells in culture divide about once per dayAssuming all cells continue to divide at this rateduring development, how long would it take togenerate anadult organism.3. Why is it, do you think, that adult humans take longerto developthan these calculations might suggest?
An adult human is composed of about 1013 cells, all of which are derived by cell division from a single fertilized egg. 1. Assuming that all cells continue to divide (like bacteria in rich media), how many generations of cell divisions would be required to produce 1013 cells? 2. Human cells in culture divide about once per day. Assuming all cells continue to divide at this rate during development, how long would it take to generate an adult organism. 3. Why is it, do you think, that adult humans take longer to develop than these calculations might suggest? Testing and Thinking
By way of an introduction to problem-solving,considerthe3X3 square array ofblack dots belowand devise a strategyfor connectingall9 dots with4 straightlines withoutremoving your pencil (or pen)from thepaperTwo incorrect solutionsR(3)(2)(4)
By way of an introduction to problem-solving, consider the 3×3 square array of black dots below and devise a strategy for connecting all 9 dots with 4 straight lines without removing your pencil (or pen) from the paper. Two incorrect solutions
Answer for (2006/3/2)Unfair!You didn't tell us we could gooutside the sguare!True! but I didn't tell you that you couldn'teither! (There may well be other solutions...!)Thesquare"problem aboveis often usedtoillustratetheprinciple ofThinking(2)Outside the Box"思考者可跳出任何框架This sort of problem tests your IQ more than it does acquiredknowledge, and you won't encounter anything similarly in cellbiology.Thinking about this problem and this solution, howeverprovides some useful, general hints for cell biology problemsolving
3 Answer for (2006/3/2) Unfair! You didn't tell us we could go outside the square! True! but I didn't tell you that you couldn't either! (There may well be other solutions.!) 思考者可跳出任何框架 The "square" problem above is often used to illustrate the principle of "Thinking Outside the Box". This sort of problem tests your IQ more than it does acquired knowledge, and you won't encounter anything similarly in cell biology. Thinking about this problem and this solution, however, provides some useful, general hints for cell biology problem- solving
一判断题：判断以下各题，正确的标T，错误的标F。1．细胞质是细胞内除细胞核以外的原生质。2。细胞是生命活动的基本功能单位，也是生命的惟一表现形式并反映在3．生命具有自我复制、自我装配和自我调控的基本特征，细胞的各级结构水平上。4．原生质是细胞内除了细胞核以外的生活物质。答：T，正确；答：F：病毒也是生命。答：T：答：F，原生质是细胞内所有的生活物质，包括细胞核和细胞质
一、判断题：判断以下各题,正确的标T，错误的标F。 1．细胞质是细胞内除细胞核以外的原生质。 2．细胞是生命活动的基本功能单位, 也是生命的惟一表现形式。 3. 生命具有自我复制、自我装配和自我调控的基本特征， 并反映在 细胞的各级结构水平上。 4. 原生质是细胞内除了细胞核以外的生活物质。 1. 答：T, 正确； 2. 答：F; 病毒也是生命。 3. 答：T； 4. 答: F, 原生质是细胞内所有的生活物质, 包括细胞核和细胞质
选择题二1.关于原核生物同真核生物的主要差别是（a.原核生物无定形的细胞核，真核生物则有b.原核生物DNA环状.真核生物DNA线状C.原核生物基因转录翻译偶联，真核生物则分开d.原核生物没有细胞骨架，真核生物则有2.最小的细胞是（a.细菌b. 类病毒c.支原体d.病毒3.下列内容中除了（)以外，都是细胞学说的要点a.所有生物都是由一个或多个细胞构成b.细胞是生命的最简单形式C.细胞是生命的结构单元d.细胞从初始细胞分化而来
二、选择题 1. 关于原核生物同真核生物的主要差别是( ) a. 原核生物无定形的细胞核, 真核生物则有 b. 原核生物DNA环状, 真核生物DNA线状 c. 原核生物基因转录翻译偶联，真核生物则分开 d. 原核生物没有细胞骨架, 真核生物则有 2. 最小的细胞是( ) a．细菌 b．类病毒 c．支原体 d. 病毒 3.下列内容中除了( )以外, 都是细胞学说的要点 a. 所有生物都是由一个或多个细胞构成 b. 细胞是生命的最简单形式 c. 细胞是生命的结构单元 d. 细胞从初始细胞分化而来 1. a 2. c 3. b