uracil

uracil — noun

1. A nitrogen-containing base that belongs to the set of molecules forming the gene

1.名詞C1
釋義

A nitrogen-containing base that belongs to the set of molecules forming the genetic code in RNA. Inside the RNA chain, uracil bonds with adenine, filling the same role that thymine plays in DNA.

例句

During transcription, RNA polymerase inserts uracil wherever the DNA template has an adenine.

uracil pairs with adenine during transcription

The technician checked whether each uracil in the RNA fragment was correctly matched.

反義詞
  • thymine

    Thymine is the pyrimidine base found in DNA that fills the same role uracil fills in RNA.

文法句型

uracil + verb (singular)

uracil in [molecule/process]

用法筆記

Uracil is an uncountable noun in scientific writing; it takes singular verb agreement. Distinguish from thymine: uracil appears only in RNA, while thymine appears only in DNA.

常見錯誤

❌The uracil base is found in both DNA and RNA.
✅Uracil is found only in RNA, not in DNA.
💡uracil replaces thymine in RNA but does not appear in DNA.
❌Uracil are one of the four bases in RNA.
✅Uracil is one of the four bases in RNA.
💡uracil is an uncountable noun and takes a singular verb.