ESAT生物 27题40分钟 B1到B11 十一个主题
ESAT 的生物模块是五个模块里唯一以学科知识为主的选考模块。UAT-UK 官网写明，每个模块 27 道选择题、40 分钟，单独计时也单独出分。生物的知识范围不是某一本书，而是 Appendix 1 里 B1 到 B11 十一个主题，再加上 Mathematics 1 的七个数学主题。这个组合决定了复习重心：生物内容决定你能不能看懂题干，数学内容决定你能不能在九十秒内算出选项。很多学生以为生物的难点在知识量，实际失分更多发生在比例、概率与单位换算上。把考纲里的 B 类和 M 类分开列一遍，缺口会立刻显现。
Biology is the one ESAT module where subject knowledge carries real weight, yet it remains a reasoning test rather than a recall test. UAT-UK states that every module contains 27 multiple-choice questions in 40 minutes, timed and scored on its own. The examinable range is the eleven Biology topics B1 to B11 in Appendix 1 of the official specification, plus the seven topics of Mathematics 1, which all modules assume. That combination says where revision time belongs, because the Biology content decides whether the question makes sense and the mathematics decides whether an option can be reached in about ninety seconds.
B1 细胞：结构分工与尺度换算
细胞这一节的题干通常给出一张结构图或一组尺度数据，问的是功能与数量关系。线粒体与核糖体的分工、细胞膜与细胞壁的组成、原核细胞与真核细胞的差别，都写在官方考纲的 B1 里。细胞器的膜结构数量也是个考点，线粒体与叶绿体都是双层膜。尺度题是这里丢分最集中的一类，题目给出细胞直径或细胞器长度，要求判断量级。考纲要求熟悉 nano 到 giga 的 SI 前缀与负指数写法，所以 20 微米写成 2 乘 10 的负 5 次方米是很常见的写法。常见的错误是把微米与纳米混着用，一步差出一千倍，而选项里恰好摆着那个错值。把单位先统一，后面的比例与浓度题也会跟着顺。
Cell items usually arrive with a diagram or a set of dimensions, and the question turns on function or on scale. Mitochondria and ribosomes, the make-up of the membrane and the wall, and the split between prokaryotes and eukaryotes are all listed under B1 of the official specification. Scale is where the marks go, because the paper supplies a cell diameter or an organelle length and expects an order of magnitude, and SI prefixes from nano to giga with negative index notation are assumed knowledge. Micrometres and nanometres are easy to swap, a factor of a thousand changes the option, and the wrong value is always on the list.
B2 跨膜运输：扩散、渗透与主动运输
B2 处理的是物质怎么穿过膜，包括简单扩散、促进扩散、渗透与主动运输。膜上的通道蛋白与载体蛋白是两类不同的结构，题干常在这一点上做文章。渗透题几乎都围绕水势与浓度梯度，给出两个溶液或一段肠段实验，问水往哪边走、净移动在哪里停止。主动运输的解释要同时写清载体蛋白与 ATP，缺一个，因果链就断了。表面积与体积比是这一节与 B9 共用的概念，体积越大，相对表面积越小，光靠扩散供不上，才需要循环系统。很多学生以为渗透就是水从溶质浓度高的地方流向浓度低的地方，准确的说法是水从水势高的地方流向水势低的地方。把膜两侧的水势先标出来，方向就不会写反。
Transport is where the paper asks how substances cross a membrane, whether by simple diffusion, facilitated diffusion, osmosis or active transport. Channel proteins and carrier proteins are different structures, and questions exploit that difference. Osmosis items are built on water potential and gradients, and they usually hand you two solutions or a length of gut and ask which way water moves and where net movement stops. Active transport needs both a carrier protein and ATP in the account, because leaving one out breaks the causal chain.
B3 细胞分裂与性别决定：染色体数目怎么变
B3 把有丝分裂、减数分裂、无性生殖与有性生殖、性别决定放在一起，考的是染色体数目怎么变。有丝分裂产生两个与母细胞相同的二倍体细胞，减数分裂产生四个染色体数目减半的细胞。减数第一次分裂时同源染色体分开，第二次分裂时姐妹染色单体分开，这两步顺序写反，后面的数目就全乱。性别决定的题干多用遗传图解，要求写出子代的男女比例，这类题与数学 1 的概率在同一层逻辑上。错得最多的是把配子的染色体数写成 2n，或者把受精卵写成 n。每一步先标出 2n 与 n，再画图解，比凭印象推快得多。看懂分裂各期的图，比背阶段名称重要。
This topic gathers mitosis, meiosis, asexual and sexual reproduction and sex determination, and the thread running through all of them is what happens to chromosome number. Mitosis gives two diploid cells identical to the parent cell, while meiosis gives four cells with half the chromosome number. Homologous chromosomes separate in the first meiotic division and sister chromatids in the second, and reversing that order wrecks every ratio that follows. Sex determination items are usually genetic diagrams asking for the expected ratio of male to female offspring, which sits on the same probability logic as Mathematics 1.
B4 遗传：比例与概率是数学 1 的用武之地
B4 的遗传题是生物模块里最依赖数学的一节。单基因杂交、双基因杂交、性连锁性状、共显性与不完全显性都可能出现，题干往往给一张谱系图或者一组子代比例。解题要先把亲本的基因型写成符号，再推配子组合，最后用比例或概率算出答案。考纲写明所有模块都假设掌握 Mathematics 1，比例与概率正是 B4 用到 M3 与 M7 的地方。常见的错误是把 3 比 1 直接当成答案，而不换算题目要求的分数形式，或者忘了性连锁性状里男女比例并不相同。把每一步的基因型写出来，比在心里推概率稳。双基因杂交先分开算每对基因，再相乘，这一步最容易在顺序上出错。
Inheritance is the part of the Biology module that leans hardest on mathematics. Monohybrid and dihybrid crosses, sex-linked traits, codominance and incomplete dominance can all appear, usually with a pedigree diagram or a set of offspring ratios. The reliable route is to write parental genotypes as symbols, work out the gametes, then finish with a ratio or a probability. The specification states that every module assumes Mathematics 1, and ratio and probability are exactly where B4 meets M3 and M7.
B5 DNA：碱基配对与半保留复制
B5 覆盖 DNA 的结构、碱基配对规则与半保留复制。碱基计算题给出一条链的碱基比例，要求算出互补链或者整段双链中某个碱基的数目，依据是 A 与 T 配对、G 与 C 配对这两条规则。复制题问的是每轮复制后含旧链的分子有几个，答案来自半保留复制的定义，不靠背数字。转录与翻译的题干给出 DNA 序列，要求写出 mRNA 密码子或氨基酸序列，这一步最容易在链的方向与互补配对上出错。很多学生以为碱基计算只要把数字代进公式，其实要先判断题目问的是单链比例还是双链比例。把链的方向标清楚，计算就不容易翻车。DNA 与 RNA 的糖和碱基差别是常考的小点。
This topic covers the structure of DNA, the base pairing rules and semi-conservative replication. Base calculation items give the proportions on one strand and ask for the complementary strand or for the whole double helix, and everything follows from A pairing with T and G pairing with C. Replication questions ask how many molecules still contain an original strand after each round, which the definition of semi-conservative replication answers without any memorised numbers. Transcription and translation items supply a DNA sequence and expect codons or an amino acid sequence, which is where strand direction and complementary pairing are easiest to reverse.
B6 基因技术：PCR、限制酶与电泳
B6 是很多学生没打开过的一节，学校常把它放在选修位置或者直接跳过。官方考纲列出的内容包括限制酶、连接酶、PCR、凝胶电泳与基因改造的基本步骤。PCR 题多考三步循环的温度变化与引物方向，电泳题多考片段大小与迁移距离的关系。这类题的形式一般是给一个实验流程或一张电泳图，问结果或者问哪一步出了问题。常见的错误是把电泳图上位置高的条带当成小片段，或者把 PCR 的退火与延伸温度写反。把这几个步骤的顺序与温度整理成一张流程图，考场上能省下不少时间。限制酶切出的黏性末端与连接酶的作用对象，也都是常考点。
Gene technologies is the topic many candidates have never opened, because plenty of school courses park it in an optional slot or skip it altogether. The specification lists restriction enzymes, ligase, PCR, gel electrophoresis and the basic steps of genetic modification. PCR items tend to test the three temperature stages and primer direction, while electrophoresis items test how fragment size relates to distance travelled. In practice the question hands you a protocol or a gel image and asks for the outcome, or for the step where something went wrong.
B7 变异：突变来源与连续变异
B7 讲变异的来源与类型，包括基因突变、染色体畸变以及减数分裂中的独立分配与交换。连续变异与不连续变异的区分是高频考点，身高与体重这类呈连续分布，血型这类呈离散类别。题目常给一组数据或两张分布图，要求判断变异类型或者解释成因。环境因素与遗传因素在连续变异里同时起作用，只写一个原因就会丢分。很多学生以为变异都是突变造成的，实际有性生殖中的配子组合本身就是变异的主要来源之一。看懂分布图的横轴与分组间隔，比背定义有用。基因突变的方向是随机的，这一点常与自然选择的方向做对比。
Variation is examined through its sources: gene mutation, chromosomal mutation, and the independent assortment and crossing over that happen in meiosis. Telling continuous from discontinuous variation apart is a frequent item, with height and weight falling in the first group and blood group in the second. Data or two distribution curves are usually supplied, and the question asks for the type of variation or its cause. Genetic and environmental factors act together in continuous variation, so a single-cause answer loses marks.
B8 酶：速率曲线与抑制剂类型
B8 的考点集中在速率曲线、最适温度与 pH、以及抑制剂类型。温度或 pH 与反应速率的关系曲线先升后降，下降段的解释是酶变性，不只是活性降低。竞争性抑制剂与非竞争性抑制剂的区别要落到曲线形状上，前者提高底物浓度可以恢复最大速率，后者降低最大速率但不改变酶与底物的亲和力。题干常给两组实验数据，要求判断哪一组用了非竞争性抑制剂。浓度、时间与速率是数学 1 里的内容，单位要看清楚再动笔。很多学生以为曲线下降段代表酶被消耗，酶在反应前后数量其实不变。先确定横纵轴是什么量，再读曲线的转折点。
Enzymes are examined through rate curves, optimum temperature and pH, and inhibitor type. The curve against temperature or pH rises and then falls, and the fall is explained by denaturation rather than by a simple drop in activity. Competitive and non-competitive inhibition have to be separated by curve shape, since raising substrate concentration restores the maximum rate with a competitive inhibitor but not with a non-competitive one. Two sets of experimental data are often given, and the question asks which one used the non-competitive inhibitor.
B9 动物生理：循环、气体交换与呼吸作用
B9 是生物模块里内容最多的一节，覆盖循环系统、气体交换、呼吸作用与体内平衡。心脏结构、心率与心电图的读法、动脉静脉与毛细血管的差别都属于这一节。血液成分的功能要能分开说，红细胞运氧，白细胞负责抗体与吞噬，血小板参与凝血，血浆运输激素、抗体、尿素与二氧化碳。气体交换与表面积体积比挂钩，肺泡与小肠绒毛共用同一个逻辑。有氧与无氧呼吸的产物和能量差别常在数据题里出现。把结构名称与功能一一对应，是这一节最省时间的复习方式。心电图的波形与心脏活动的对应关系，也是容易被跳过的一段。
Animal physiology is the largest block in the Biology specification, taking in the circulatory system, gas exchange, respiration and homeostasis. Heart structure, heart rate, ECG traces and the differences between arteries, veins and capillaries all sit here. The components of blood need to be kept apart: red cells carry oxygen, white cells handle antibodies and phagocytosis, platelets drive clotting, and plasma transports hormones, antibodies, urea and carbon dioxide. Gas exchange links straight back to surface area to volume ratio, the same logic that runs through alveoli and villi.
B10 生态系统：采样、统计与能量传递
B10 把能量传递、物质循环、采样与种群估算放在一起。食物链与食物网的能量传递题要求逐级计算，每一级通常只有大约百分之十的能量进入下一级。采样题给方框样方或者标记重捕的数据，要求估算种群数量，公式里分子与分母的顺序写反，答案就偏。统计是数学 1 的第七个主题，生态系统这一节正是统计与比例用得上的地方。光合作用与呼吸作用在碳循环里的角色也经常被问到。把样方数量与随机采样两点写进答案，评分点就完整了。标记重捕法假设标记不脱落、个体均匀混合，这两条前提常被忽略。
Ecosystems brings together energy transfer, nutrient cycles, sampling and population estimates. Energy transfer along a food chain or web is worked out step by step, with roughly ten per cent of the energy moving to the next level. Sampling items supply quadrat counts or mark and recapture data and ask for a population estimate, and a numerator and denominator the wrong way round skews the answer. Statistics is the seventh topic of Mathematics 1, and this is the section of the specification where statistics and proportion do the real work.
B11 植物生理：蒸腾、气孔与光合作用
B11 讲蒸腾、气孔、水分与矿物质的运输，以及光合作用和植物激素的基本内容。蒸腾速率受光照、湿度、风速与气孔开闭影响，题干常给一组环境条件要求比较快慢。气孔的开闭机制涉及保卫细胞的膨压变化，这一条常与 B2 的渗透内容连起来考。光合作用的限速因素题要求判断光强、二氧化碳浓度与温度哪一个在起作用。错得最多的是把木质部与韧皮部运输的物质互换，木质部运水和矿物质，韧皮部运糖和氨基酸。把两条运输路径分开记，这类题就不再需要猜。植物激素的作用与向性运动的例子也偶尔出现。
Plant physiology covers transpiration, stomata, the transport of water and minerals, photosynthesis and plant hormones. Transpiration rate depends on light, humidity, wind and stomatal opening, and items usually give a set of conditions and ask which plant loses water faster. The stomatal mechanism turns on the turgor of guard cells, which links back to the osmosis content in B2. Photosynthesis limiting-factor questions ask which of light intensity, carbon dioxide concentration or temperature is holding the rate back.
27 题 40 分钟：单独计时，时间不结转
每个模块 27 道选择题、40 分钟，平均每题不到 90 秒。真正影响策略的是计时规则，每个模块单独计时，提前做完的时间不会结转到下一个模块。考场上常见的画面是生物模块提前十分钟写完，那十分钟既不进入数学 1，也不会留在身边。时间不能挪走，就只能在模块内部把它用满，比如最后两分钟回看最没有把握的两道题。多数课程要求数学 1 加两个自选模块，三个模块连考共 120 分钟，中间没有休息。练习时应该按完整的 40 分钟一段来刷，而不是十道题一组地刷，只刷小套题的人在考场上往往到三分之二处就开始失误。稳妥的做法是先用 15 分钟扫一遍全卷，把能直接下手的题做完，再回头处理卡住的题。
Every module holds 27 multiple-choice questions and lasts 40 minutes, which works out at under ninety seconds a question. The timing rule shapes strategy more than the average does, because each module is timed on its own and time saved in one paper is not carried into the next. Finishing Biology ten minutes early gains nothing, since those minutes cannot be moved to Mathematics 1. The unit of practice should therefore be a full forty-minute block rather than a set of ten questions, because candidates who only drill in short sets tend to fall apart two thirds of the way through a real sitting.
答错不扣分与 2027 入学考期
评分规则对策略的影响比多数人预想的大，每题答对得一分，答错不扣分。这意味着把 27 道题全部作答比留空更划算，最后若还有空题，填上一个答案的期望值高于留空。每个模块的分数单独报告，用 1 到 9 分表示并保留一位小数，官方 Prepare 页写明中位数固定为 4.5、第 90 百分位固定为 7.0。成绩大约在考后四周开放，并由 UAT-UK 自动送给所申请的院校，考生不需要自己转交。按 UAT-UK 官网公布的安排，2027 入学有两场考期，十月场在 2026 年 10 月 12 日到 16 日，一月场在 2027 年 1 月 4 日到 8 日。中国内地与港澳考区的日期另有单独限制，报考前要在官网上核对当季安排。剑桥与牛津的申请人通常必须参加十月场。官方免费资料包括考纲、带解析的样题与还原考场的练习测试，建议计时完成后两者。
Scoring shapes strategy more than most candidates expect, because a correct answer earns one mark and a wrong answer costs nothing. Attempting all 27 questions therefore beats leaving blanks, and where a blank would remain, filling in an answer has a higher expected value. Each module is reported separately on a 1 to 9 scale with one decimal place, and the official Prepare pages state that the median is fixed at 4.5 and the 90th percentile at 7.0. Results open about four weeks after the test and are sent automatically to the universities applied to, while the October sitting for 2027 entry runs from 12 to 16 October 2026.
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