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067 badger/ˈbædʒə(r)/ n.

vt. 纠缠不休,烦扰

5频

badger sb. into doing sth.缠着某人做某事

American badgers and black-footed ferrets are both predators.美洲獾和黑脚雪貂都是捕食者。

068 balance/ˈbæləns/ n. 平衡;天平

v. 保持平衡;抵消

13频

work-life balance工作与生活的平衡

The balance between triglyceride formation and breakdown is controlled by hormones.甘油三酯的形成和分解之间的平衡由激素控制。

069 band/bænd/ n. 条带;乐队

vt. (将价格、收入等)划分档次;聚集

17频

rock band摇滚乐队

The diagram shows the position of the DNA band at Z in the centrifuge tube.下图显示了DNA条带在离心管中Z处的位置。

070 banded/ˈbændɪd/ adj. 带条纹的

16频

banded snake条纹蛇

The shells of this snail may be banded (have dark stripes) or non-banded.这种蜗牛的壳可以是有条纹的(深色条纹),也可以是无条纹的。

071 barred/bɑːd/ adj. 有条纹的

11频

barred feathers有条纹的羽毛

Explain how the genotype of a male chicken with blue, barred feathers could be determined.请解释如何确定蓝色条纹羽毛公鸡的基因型。

072 barrel/ˈbærəl/ n. (注射器的)空筒;桶

15频

a wine barrel葡萄酒桶

Holding the barrel of the syringe upright, fit the tubing onto the nozzle of the syringe.竖直握住注射器的空筒,将管子安装到注射器的喷嘴上。

073 barrier/ˈbæriə(r)/ n. 阻碍;屏障;界线

11频

trade barriers贸易壁垒

In living phloem, the pores are open, presenting little barrier to the free flow of liquids through them.在活的韧皮部中,气孔是开放的,液体可通过它们自由流动,几乎没有什么阻碍。

074 basic/ˈbeɪsɪk/ adj. 基本的;基础的;必需的

11频

basic principles基本原则

Each student followed the same basic procedure.每位同学都按照相同的基本程序进行操作。

075 basis/ˈbeɪsɪs/ n. 基础;基准;原因

7频

on the basis of...在……的基础之上;因为……的原因

The cells are chosen on the basis of their high level of protein synthesis.选择这些细胞是因为它们蛋白质合成的水平比较高。

076 bat/bæt/ n. 蝙蝠;球棒,球板

v. 用球棒击球

10频

cricket bat板球球板

Explain why it is likely that the eastern green mamba feeds on other organisms in addition to yellow winged bats .解释为什么东部绿曼巴蛇除了以黄色有翼蝙蝠为食,还可能以其他生物为食。

077 batch/bætʃ/ n. 一批

vt. 分批处理

14频

in batches分批

Describe the production of penicillin using the batch culture method.请描述采用分批培养法生产青霉素的方法。

078 bath/bɑːθ/ n. 沐浴;洗澡水;澡堂

v. 洗澡

175频

a public bath公共澡堂

Record the actual temperature of the water -bath .记录水浴的实际温度。

079 bead/biːd/ n. 凝胶珠;珠子;(液体)小珠

13频

a string of beads一串珠子

The student put the beads into beakers containing starch solution.学生把凝胶珠放进装有淀粉溶液的烧杯里。

080 beaker/ˈbiːkə(r)/ n. 烧杯;一杯(的量)

240频

a beaker of coffee一杯咖啡

Immediately stir the reaction mixture in the beaker and start timing.立即搅拌烧杯中的反应混合物,并开始计时。

081 bean/biːn/ n.

8频

coffee beans咖啡豆

Epicatechin is a naturally occurring compound in cocoa beans and so is present in chocolate.表儿茶素是一种天然存在于可可豆中的化合物,因此也存在于巧克力中。

082 beat/biːt/ n. 跳动声;节拍

v. 打败;敲打

18频

beat your breast捶胸顿足(尤指对自己的作为刻意表示悲伤或愧疚)

The trace represents the electrical activity of the heart during a single heart beat .这条轨迹表示心脏在单次心跳期间的电活动。

083 beetle/ˈbiːtl/ n. 甲虫

25频

dung beetle屎壳郎

There are some beetle species that feed on animal dung at the grassland site in North America.在北美的草原上,有一些以动物粪便为食的甲虫物种。

084 behaviour/bɪˈheɪvjə(r)/ n. 活动方式,表现方式;行为

22频

criminal behaviour犯罪行为

Describe the behaviour of chromosomes during meiosis.描述染色体在减数分裂过程中的活动方式。

085 bench/bentʃ/ n. 长凳;法官;(英国议会的)议员席

6频

a park bench公园长椅

Student A rested his hand on a bench .学生A把一只手放在长凳上。

086 bend/bend/ n. 弯曲

v. 使弯曲;弯腰

28频

bend your mind/efforts to sth.致力于某事

Before measuring the angle of bend , remove excess liquid from the piece of potato using the paper towel.在测量弯曲角度之前,先用纸巾把土豆上多余的液体擦去。

087 benefit/ˈbenɪfɪt/ n. 好处,益处;补助金

v. 得益

5频

for one's benefit为帮助某人

Explain the benefits of using frozen sperm in captive breeding programmes.请解释在圈养繁殖计划中使用冷冻精子的好处。

088 bind/baɪnd/ v. (使)结合;捆绑;迫使

188频

bind A to B使A和B结合

The compounds bind to specific chemoreceptors in the nasal cavities of these people.这些化合物与这些人鼻腔中的特定化学感受器相结合。

089 block/blɒk/ n. (方形)块;大楼

vt. 妨碍;阻塞

61频

barrier (n.)

office block办公大楼

The blue-green agar blocks contain an indicator.蓝绿色的琼脂块含有指示剂。

090 blunt/blʌnt/ adj. 钝的;直言不讳的

vt. 使减弱;使变钝

14频

be blunt about sth.对某事直言不讳

You may use the blunt forceps and paper towels to handle the agar.你可用钝镊子和纸巾来处理琼脂。

091 boil/bɔɪl/ v. 煮沸;煮菜

n. 沸腾

6频

on the boil十分活跃,如火如荼

After boiling , a yellow colour is observed.煮沸后,可看到液体变为黄色。

092 bond/bɒnd/ n. 键;纽带,联系

v. 使紧密结合

110频

bond A to B把A紧紧连接到B

A peptide bond is formed between the two amino acids.这两种氨基酸之间形成了肽键。

093 booster/ˈbuːstə(r)/ n. 加强剂量;帮助(或激励、改善) …… 的事物

7频

assist ( n .& v .)

a morale booster士气的激励

The vaccine was effective for up to 10 years after one dose and did not require boosters within this time.注射一次后,该疫苗的有效期长达10年有效,在这段时间内不需要增强剂。

094 borer/ˈbɔːrə/ n. 钻蛀虫

6频

rice stem borer水稻螟虫

The corn borer is an insect pest of maize.玉米螟是玉米的一种害虫。

095 born/bɔːn/ v. 出生;出现,形成

adj. 天生(有某方面才能)的

36频

a born athlete天生的运动员

Calculate the actual number of children born with HIV infection in 2007.计算2007年出生时就感染艾滋病毒的儿童的实际人数。

096 borne/bɔːn/ adj. (用于复合词)由 …… 携带的,由 …… 运载的

19频

water-borne diseases由水传染的疾病

Which two diseases are transmitted by air -borne droplets?哪两种疾病是通过空气飞沫传播的?

097 botanic/bəˈtænɪk/ adj. 植物的;植物学的

6频

botanic chemistry植物化学

Describe the role of botanic gardens in the protection of endangered species.描述植物园在保护濒危物种方面的作用。

098 bottom/ˈbɒtəm/ n. 底部;尽头

adj. 底部的;最后的

38频

at the bottom of...在……的底部

When a yeast suspension is placed in a test tube some of the cells sink slowly to the bottom .当把酵母悬浮液放入试管中时,一些细胞慢慢下沉到底部。

099 bound/baʊnd/ adj. 紧密相连的;有义务(做某事)

v. 形成 …… 的边界

26频

be bound together in sth.在某方面紧密联系

Ribosomes exist as separate subunits that are bound together during protein synthesis.核糖体作为单独的亚基存在,在蛋白质合成过程中结合在一起。

100 bracket/ˈbrækɪt/ n. 括号;(固定在墙上的)托架;等级

vt. …… 相提并论

283频

people in the lower income bracket低收入等级人群

Insert into the brackets the number of sets of chromosomes in each cell type.在括号中填入每种细胞类型的染色体组数。

101 break/breɪk/ v. 破坏;违反

n. 休息;暂停

73频

break an agreement违反协议

Which molecular bonds will be broken by hydrolysis when a molecule of glycogen is converted to glucose?当糖原分子转化为葡萄糖时,哪些分子键会被水解破坏?

102 breathe/briːð/ v. 呼吸;低声说;透气

5频

breathe in/out吸气/呼气

A person breathes in small particles from a very dusty environment.某人从尘土飞扬的环境中吸入了微小的颗粒物。

103 breed/briːd/ v. 繁殖;培育(动植物);引起

n. 品种

18频

rare breeds of cattle稀有品种的牛

The adult frogs breed by laying eggs in water in spring.成年蛙在春天通过水中产卵的方式进行繁殖。

104 broad/brɔːd/ adj. 宽的;广泛的;概括的

5频

a broad spectrum of interests广泛的兴趣

The overall shape of most leaves is thin and broad .大多数树叶的整体形状是薄而宽的。

105 bubble/ˈbʌbl/ v. 起泡;(感情)充溢,存在

n. 气泡

29频

bubble up产生气泡

How are the sugars taken up by the cells when air is bubbled through the culture?当培养物中冒气泡时,细胞是如何吸收糖分的?

106 bud/bʌd/ n. 芽;花蕾

vi. 发芽

8频

come into bud长出花苞

When the apical bud is actively growing, it tends to stop lateral buds from growing.生长旺盛的顶芽会抑制侧芽的生长。

107 buffer/ˈbʌfə(r)/ n. 缓冲物;缓冲器

vt. 减少;保护

74频

buffer sb. against sth.使某人免受某事(物)的侵害

The scientist mixed the cells with a buffer solution which had the same water potential as the cells.科学家将这些细胞与细胞水势相同的缓冲液进行混合。

108 bundle/ˈbʌndl/ n. 束,捆;一批

v. 匆匆送走

105频

bunch ( n .)

a bundle of ideas一套想法

The photomicrograph shows a vascular bundle from the stem of a plant.显微照片显示植物茎上有一束维管束。

109 burst/bɜːst/ v. (使)爆裂;突然出现

n. 迸发;裂口

9频

burst into tears突然大哭起来

A disease damages alveoli walls, causing the alveoli to burst .某种疾病会破坏肺泡壁,导致肺泡破裂。

110 button/ˈbʌtn/ n. 按钮;纽扣

v. 扣上 …… 的纽扣

11频

on the button准时;确切

Each student looks at a computer screen and clicks a start button on the screen and waits for the background colour to change.每位同学看着电脑屏幕,点击屏幕上的开始按钮,等待背景颜色改变。

111 bypass/ˈbaɪpɑːs/ n. (心脏)搭桥手术;(绕过城镇中心的)旁道

v. 绕过;不顾(规章制度)

7频

heart bypass surgery心脏搭桥手术

Coronary artery bypass grafting is the most common heart operation in the world.冠状动脉旁路移植术是世界上最常见的心脏手术。 A2KaNr/1wkkJK1yMQdxfjNNZITxFnz/rt+rVi7kOPWW9RjlyG6wEu8gU+Qs5Cg1v

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