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Fundamentals Of Nursing (NSG 120) Test 2019

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John Marsh
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Test 2019, questions and answers

Strayer University

Fundamentals of nursing (NSG 120)

Exam
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the
question.
1) The term phospholipid can best be described by which of the following? 1)
A) a nonpolar lipid molecule that is made polar by the addition of a phosphate
B) a polar lipid molecule that fully repels water
C) a nonpolar lipid molecule that is made amphipathic by the addition of a phosphate
D) a polar lipid molecule that fully interacts with water
2) What region of a steroid is hydrophilic? 2)
A) the ring structures B) the long hydrocarbon chain
C) the terminal hydroxyl group D) the methyl (-CH3) groups
3) What most distinguishes lipids from other biomolecules is _____. 3)
A) that only lipids contain hydrogen atoms B) their chemical properties
C) where they are found in the body D) their molecular weight (size)
4) Cooking oil and gasoline (a hydrocarbon) are not amphipathic molecules. Why? 4)
A) They are highly reduced molecules.
B) They spontaneously form micelles or liposomes in solution.
C) They do not have a polar or charged region.
D) They do not have a hydrophobic region.
5) Steroids such as cholesterol are an important component of animal cell membranes but do not
actually form the membrane. Why?
5)
A) Lipids that form membranes are amphipathic with a polar region and a nonpolar region.
B) Steroids are too permeable to charged molecules to form a cell membrane.
C) The ring structure of steroids is too bulky to form a membrane.
D) Steroids cannot interact with other molecules, which is required to form a cell membrane.
6) How do phospholipids interact with water molecules? 6)
A) The polar heads interact with water; the nonpolar tails do not.
B) The polar heads avoid water; the nonpolar tails attract water (because water is polar and
opposites attract).
C) Phospholipids dissolve in water.
D) Phospholipids don’t interact with water because water is polar and lipids are nonpolar.
1
7) You make a phospholipid bilayer with short, saturated hydrocarbon tails. You measure the
permeability of this membrane to oxygen. You then double the length of the hydrocarbon tails, and
remeasure membrane permeability. You then double the length of the hydrocarbon tails again, and
make a third measurement of membrane permeability. You graph membrane permeability as a
function of hydrocarbon tail length. Which of the graphs below best represents the data you
expect?

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Fundamentals Of Nursing (NSG 120) Test 2019

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