DNA replication - 3D – YouTube Dictation Transcript & Vocabulary
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交互式逐字稿与高亮
1.DNA is a molecule made up of two strands around each other in a double helix shape
2.Each strand is made up a sequence of four chemical bases by the letters A, C, G and T
3.The two strands are
4.This means that wherever there's a T in one strand there will be in an A in the opposite strand, and wherever there's a C there will be a G in the other strand
5.Each strand has a 5' end and a 3' end
💡 Tap the highlighted words to see definitions and examples
关键词汇（CEFR B1）
represented
B1To present again or anew; to present by means of something standing in the place of; to exhibit the counterpart or image of; to typify.
Example:
"represented by the letters A, C, G and T."
twisted
A2To turn the ends of something, usually thread, rope etc., in opposite directions, often using force.
Example:
"twisted around each other in a double helix shape."
helicase
A2A A2-level word commonly used in this context.
Example:
"This unzipping is done by an enzyme called helicase"
finally
A2At the end or conclusion; ultimately.
Example:
"Finally the enzyme DNA ligase seals up the fragments of DNA"
complementary
B1A complementary colour.
Example:
"The two strands are complementary."
directions
A2A theoretical line (physically or mentally) followed from a point of origin or towards a destination. May be relative (e.g. up, left, outbound, dorsal), geographical (e.g. north), rotational (e.g. clockwise), or with respect to an object or location (e.g. toward Boston).
Example:
"The two strands run in opposite directions."
determines
A2To set the boundaries or limits of.
Example:
"This determines how each strand of DNA is replicated."
replicated
A2To make a copy (replica) of.
Example:
"This determines how each strand of DNA is replicated."
unzipping
A2To open something using a zipper.
Example:
"This unzipping is done by an enzyme called helicase"
formation
B2Something possessing structure or form.
Example:
"and results in the formation of a replication fork."
| 单词 | CEFR | 释义 |
|---|---|---|
| represented | B1 | To present again or anew; to present by means of something standing in the place of; to exhibit the counterpart or image of; to typify. |
| twisted | A2 | To turn the ends of something, usually thread, rope etc., in opposite directions, often using force. |
| helicase | A2 | A A2-level word commonly used in this context. |
| finally | A2 | At the end or conclusion; ultimately. |
| complementary | B1 | A complementary colour. |
| directions | A2 | A theoretical line (physically or mentally) followed from a point of origin or towards a destination. May be relative (e.g. up, left, outbound, dorsal), geographical (e.g. north), rotational (e.g. clockwise), or with respect to an object or location (e.g. toward Boston). |
| determines | A2 | To set the boundaries or limits of. |
| replicated | A2 | To make a copy (replica) of. |
| unzipping | A2 | To open something using a zipper. |
| formation | B2 | Something possessing structure or form. |
听写练习语法与发音技巧
Chunking
注意说话人在特定短语后的停顿，可帮助理解。
Linking
聆听连读现象，当单词连在一起时。
Intonation
关注音调变化，理解重点信息。
视频难度分析与数据
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