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Zorluk: KolayPunctuation of Nonessential Elements

During her research in the 1940s, geneticist Barbara McClintock made a revolutionary discovery while studying maize chromosomes. McClintock identified transposons ______ which challenged the prevailing scientific belief that genomes are static. Her pioneering work eventually earned her the Nobel Prize in Physiology or Medicine in 1983.

Which choice completes the text so that it conforms to the conventions of Standard English?

  1. A
    , genetic elements that can change positions within a genome—
  2. —genetic elements that can change positions within a genome—Cevap
  3. C
    —genetic elements that can change positions within a genome,
  4. D
    genetic elements that can change positions within a genome,

Cevap

—genetic elements that can change positions within a genome—
The sentence includes a nonessential appositive phrase that provides additional information about transposons. In Standard English, nonessential elements must be set off from the rest of the sentence using matching punctuation marks on both sides. The option that begins and ends the phrase with em dashes correctly isolates the nonessential clause.

Adım Adım Çözüm

1
Identify the nonessential element in the sentence.
The phrase 'genetic elements that can change positions within a genome' functions as an appositive that describes 'transposons' and is not essential to the main clause structure.
Nonessential elements must be separated from the rest of the sentence by matching punctuation marks.
2
Check the punctuation choices for symmetry.
Standard English conventions require that if a nonessential element is set off by an em dash on one side, it must be closed by an em dash on the other side.
Mismatching punctuation marks (like a comma paired with an em dash) creates grammatically incorrect asymmetry.
3
Select the option with matching punctuation.
The option containing '—genetic elements that can change positions within a genome—' successfully closes the parenthetical information using a pair of em dashes.
This maintains punctuation symmetry and correctly conforms to standard English conventions.

Anahtar Kavram

Punctuation of Nonessential Elements
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Konular

Punctuation of Nonessential Elements

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