Official ExplanationA eukaryotic cell has a nucleus, the brain of the cell housing the
chromosomes and protecting DNA transcription, Golgi apparatus, or a complex of folded membranes for packaging proteins and lipids, and plasma membrane, the protective barrier responsible for controlling the passage of all molecules into and out of the cell.
A. chromosomes and protecting DNA transcription, Golgi apparatus, or a complex of folded membranes for packaging proteins and lipids,
B. chromosomes, and protection of DNA transcription, and Golgi apparatus, or a complex of folded membranes for packaging proteins and lipids,
C. chromosomes, and protecting DNA transcription, Golgi apparatus, a complex of folded membranes for packaging proteins and lipids;
D. chromosomes and protecting DNA transcription; Golgi apparatus, to package proteins and lipids in a complex of folded membranesE. chromosomes and protecting DNA transcription; Golgi apparatus, a complex of folded membranes for packaging proteins and lipids;Looking at these answer choices is a little overwhelming. There are a lot of technical words and a lot of punctuation marks, and it is not even quite clear what the sentence is even trying to say.
If we look a little closer at the answer choices, the biggest difference between them is the placement and type of punctuation, either commas or semicolons.Let’s start by trying to figure out what the sentence is talking about by looking at the first non-underlined portion. “A eukaryotic cell has a nucleus, the brain of the cell housing the . . .” The subject of the sentence is “a eukaryotic cell.” The verb is “has,” which is telling us that the cell contains something—a nucleus. The word nucleus is followed by a comma. The content after that comma is a noun phrase that ends with another comma (the brain of the cell housing and protecting DNA transcription). When a noun or noun phrase is enclosed in commas and follows another noun or noun phrase (like nucleus) then the phrase in commas is known as an appositive. It is further describing the noun it follows.
Now, let’s look at the non-underlined portion that comes after our underlined portion. If we ignore the underlined portion and the appositive phrase modifying “nucleus,” the sentence reads “A eukaryotic cell has a nucleus and plasma membrane, the protective barrier responsible for controlling the passage of all molecules into and out of the cell.” Once again, “plasma membrane” is a noun followed by noun phrase enclosed in commas. When we ignore all the appositives, our sentence says “A eukaryotic cell has a nucleus and plasma membrane.” This sentence is a list! When lists includes lots of commas, then semicolons are used to separate the items in the list. Let’s eliminate any answer choices that don’t have semicolons.
Options A and B cannot be the best answers.Option C only has one semicolon and places it at the very end of the answer choice. Only one semicolon would not create a complex list, and instead a single semicolon is used to connect two independent clauses without a coordinating conjunction. What comes after the semicolon must be an independent clause. The part after the semicolon would read “And plasma membrane, the protective barrier responsible for controlling the passage of all molecules into and out of the cell.” A coordinating conjunction is not necessary with a semicolon separating two independent clauses, so the “and” is redundant. “And plasma membrane” does not make any sense as a modifier at the beginning of the sentence. The independent clause that was created by the semicolon in Option C is awkward at best and nonsensical at worst.
Option C cannot be the best answer.Option D appears to place a semicolon between two items in the list. If we remove the appositives, the sentence in Option D would read “A eukaryotic cell has a nucleus; Golgi apparatus, and plasma membrane. A single semicolon once again tries to create two independent clauses instead of a complex list, and the second “independent” clause doesn’t make any sense.
Option D cannot be the best answer.Option E uses a semicolon to separate each item in the list (nucleus, Golgi apparatus, and plasma membrane) and each item’s appositive phrase. This is the correct use of a semicolon in a complex list, and the sentence, though long, does make sense.
Option E is the best answer.