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Verbal·Standard English Conventions·Within-Sentence Punctuation
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Cholesterol is a familiar term in contemporary
discussions concerning health and heart disease. Primarily
synthesized by our own bodies, 1 the ability to function
diversely in cell membranes and various organ systems is
one characteristic of this molecule. However, its presence is
not 2 profitable in all circumstances: when an individual
consumes food that leads to high blood cholesterol levels,
significant health complications may result. Because
this molecule plays such a critical role in our health, it’s
important to understand its function and recognize the
dangers associated with having high cholesterol levels.

Cholesterol molecules have a diverse range of functions
within the human body, whether in cell membranes or as
3 part of: the nervous, endocrine, or digestive systems. In
part due to its rigid, tetracyclic structure, cholesterol
contributes to the structural integrity of cell membranes.
A research study conducted by Sheng et al. revealed that
membrane cholesterol also participates in cellular signaling
through binding to specific domains of some proteins.
Furthermore, cholesterol is a key component of the central
nervous system, where it primarily 4 existed in the
myelin sheaths of nerve cells; these sheaths help increase
the speed of nerve impulse transmission. 5 In addition
to these functions, cholesterol is an important precursor
to bile acids of the digestive system and steroids of the
endocrine system.

6 To illustrate the importance of contemporary
research on cholesterol, its presence in abnormally high
concentrations can result in significant health issues. Many
researchers believe that certain dietary 7 choices, for
example, eating—significant amounts of saturated fats and
avoiding unsaturated fats—contribute to high cholesterol
levels in the bloodstream. Since cholesterol molecules do
not dissolve in water or blood, 8 they are also transported
to various parts of the body by lipoproteins, which are
constructed from both fats and proteins. 9 When the
concentration of LDL cholesterol is high, it may clog
an individual’s arteries and lead to a variety of medical
conditions.

Notwithstanding the health risks associated with
high cholesterol levels, it is important to remember that
this molecule is 10 integral to many necessary and vital
life functions. From the structure of cell membranes to
the swift conduction of nerve impulses, from digestion to
hormone production, many physiological structures and
processes depend on cholesterol. Consequently, 11 it’s
important to fund future research initiatives that investigate
the significance of this molecule.
Which choice is the best version of the underlined portion? If the original is best, choose NO CHANGE.
A
NO CHANGE
B
choices; for example, eating substantial amounts of saturated fats and avoiding unsaturated fats;
C
choices—for example, eating substantial amounts of saturated fats and avoiding unsaturated fats—
D
choices, for example: eating substantial amounts of saturated fats and avoiding unsaturated fats,