时间:2019-01-10 作者:英语课 分类:与美国小学生一起学英文第12册


英语课

   Mutation 1 突变


  Do you know about mutations? 你知道突变吗?
  A mutation happens when the DNA 2 structure in a gene 3 changes. 当基因的DNA结构发生变化时就会发生突变。
  Once a mutation happens, the change can't be reversed. 突变一旦发生,改变就无法逆转。
  Is this difficult for you to understand? 你很难理解是吗?
  Imagine that there is a machine, the machine gives orders to other machines. 想象有一台机器向其他机器发指令。
  According to the orders, other machines make a car. 根据指令,其他机器制造一辆汽车。
  If the orders change, they will make a different type of car. 如果指令变了,它们会造出一辆不同类型的汽车。
  A mutation is like an incorrect order. 突变就像错误的指令,
  Many people and animals are born with diseases or physical difficulties because of mutations. 许多人和动物因为突变,出生时就有疾病或生理缺陷。
  Are mutations always bad? 突变都不好吗?
  No, evolution is kind of mutation. 不是,进化也是一种突变。

n.变化,变异,转变
  • People who have this mutation need less sleep than others.有这种突变的人需要的睡眠比其他人少。
  • So far the discussion has centered entirely around mutation in the strict sense.到目前为止,严格来讲,讨论完全集中于围绕突变问题上。
(缩)deoxyribonucleic acid 脱氧核糖核酸
  • DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。
  • Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。
n.遗传因子,基因
  • A single gene may have many effects.单一基因可能具有很多种效应。
  • The targeting of gene therapy has been paid close attention.其中基因治疗的靶向性是值得密切关注的问题之一。
标签: 小学英语
学英语单词
a children's treat
a small matter
acoustic transducer array
adaptability of operation
after-punching
agency general
alan shepards
antiprolactin
arc tunnel
Backstairs Pass.
Banarlι
benign calcifying epithelioma
bitt
bursae musculi subscapularis subtendinea
business pick-up
catalyst bead system
composite algorithms
containing wall
cs-in-cs
current sink logic
cybersitter
debye factor
democratic deliberation
department faculty
diode transformer
doctrine of natural rights
drip irrigation by gravity
electric discharge atomic vapor laser
epidermo-
episcopals
Eucken, Rudolph Christoph
eventuation
excitates
fall off the wagon
falu
fastness to heat
flame blowing
genus hibiscuss
have bellows to mend
Hazar-susah
hoist piston rod
hold the palm
in full view
insulectrics
isopropamide iodide
kra
lambing shed
leipobrachia
LIDB
location between the exterior and interior
Loffler's pneumonia
long rotator muscles
longiusculus
M-discontinuty
macrocephalas
main bearing stay bolt
mayeski
melt elasticity
Moehringia lateriflora
monostable flipflop
most-likely
neolalia
nominal hygiene air requirement
non-alkali glass fibre
number carrying system
O grade
order Eubacteriales
pacquets
patrilocally
phalloaynia
photocell pickoff
pickaninnies
playtes
polka-dot agate
positive illusion
postgraduate education
prosperity robot
pseudorhombus oligodon
queenstown
recall type examination
rumchunder
safflors
sales control research
sap tree
schemeless
seringe
serum death
servo-type mechanism
software, navigation
spurious signal
stake off
thin-film rectifier
tooth form factor
Trilobine
unbiassed test
unstockinged
uretoric
valve jacket
waveness
weedery
wheelis
yokoi