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==Proofreading in biology==
The term proofreading is used to refer to the error-correcting processes involved in [[transcription (genetics)|transcription]] of a genetic code. In [[bacteria]], all three DNA polymerases (I, II, and III) have the ability to proofread, using 3'->5' exonuclease activity. In [[eukaryote]]s only the polymerases that deal with the elongation (γ, δ and ε) have proofreading ability (3'->5' exonuclease activity).
==Proofreading in UK schools==
[[Teacher]]s regularly have to assess their students' exams and essays. They usually use the General Proofreader Marks advised by the Ministry of Education. These mistake symbols have to be used officially in A-Level examinations in the [[United Kingdom]].
{|
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| <nowiki>|</nowiki>O || wrong spelling (orthography)
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| <nowiki>|</nowiki>P || punctuation
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| <nowiki>|</nowiki>Gr || grammar (e.g.: he walk)
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| <nowiki>|</nowiki>E || wrong expression
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| <nowiki>|</nowiki>W ''or'' <nowiki>|</nowiki>L || wrong word (lexical mistake)
|-
| <nowiki>|</nowiki>√ || word left out
|-
| <nowiki>|</nowiki>Pr || preposition
|-
| <nowiki>|</nowiki>Pron || pronoun
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| <nowiki>|</nowiki>T || tense
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| <nowiki>|</nowiki>Const || wrong construction
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| <nowiki>|</nowiki>Str || structure
|-
| <nowiki>|</nowiki>Ps || position
|}
==See also==
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