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Sentence Correction: Subject Verb Agreement - Verb Precedes Subject

A glycoprotein is a protein to which have been attached a monosaccharide, disaccharide, oligosaccharide, or polysaccharide

Well done!

This answer choice corrects the Subject Verb Agreement mistake in the original sentence, by changing the plural verb have to the singular verb has.

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Incorrect.

While this answer choice corrects the Subject Verb Agreement mistake in the original sentence by changing the plural verb have been attached with the singular verb is attached, it changes the meaning of the sentence by adding the preposition by to the verb attached and replacing the connector or at the end of the list with and.

To say that the protein is attached by monosaccharides, etc. implies that the saccharide molecule's job is to attach the protein to something else. The original sentence, however, is saying that the protein has a saccharide molecule attached to it.

Incorrect.

This answer choice repeats the Subject Verb Agreement mistake in the original sentence.

The plural verb have does not agree with the singular subject a monosaccharide (and the alternative singular subjects in the remainder of the list: (a) disaccharide, (a) oligosaccharide, or (a) polysaccharide). The use of or before the end of the list means that each -saccharide is an alternative for the first singular subject mentioned in the list.

[[snippet]]

Incorrect.

While this answer choice corrects the original Subject Verb Agreement mistake by replacing the conjugated verb have been attached with the adjective attached, it is stylistically flawed: the word else is unnecessary and redundant.

Incorrect.

This answer choice is grammatically incorrect. The plural verb have does not agree with the singular subject a monosaccharide, or with the other saccharides listed as alternative singular subjects for this sentence.

Although the long list of saccharides appears to add up to a plural subject, this is not the case. Note that the subjects are not connected by and. The use of or before the end of the list means that each -saccharide is an alternative for the first singular subject mentioned in the list.

[[snippet]]
to which have been attached a monosaccharide, disaccharide, oligosaccharide, or polysaccharide
with an attached monosaccharide, disaccharide, oligosaccharide, or else polysaccharide
which a monosaccharide, disaccharide, oligosaccharide, or polysaccharide have been attached to
which is attached by monosaccharides, disaccharides, oligosaccharides, and polysaccharides
to which a monosaccharide, disaccharide, oligosaccharide, or polysaccharide has been attached