Lipids are needed by the body: (Select all that apply)
For fluid balance
As component of myelin sheath
Component of hemoglobin
As component of cell membrane
As an energy source
Correct Answer : B,D,E
A. For fluid balance: Lipids do not play a direct role in maintaining fluid balance; electrolytes and plasma proteins like albumin regulate this function.
B. As a component of the myelin sheath: Lipids, particularly phospholipids and cholesterol, are essential for forming the myelin sheath, which insulates nerve fibers and facilitates efficient nerve conduction.
C. Component of hemoglobin: Hemoglobin is composed of iron and protein (globin chains), not lipids.
D. As a component of the cell membrane: Cell membranes are composed of a lipid bilayer (phospholipids and cholesterol), which helps maintain structural integrity and fluidity.
E. As an energy source: Lipids provide a concentrated energy source, yielding 9 kcal per gram, which is more than carbohydrates (4 kcal/g).
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Appear yellow: Yellow skin is often due to jaundice (bilirubin accumulation) or carotene deposits, not keratinization.
B. Are hardened and water-resistant: Keratinization involves the production of keratin, making the epidermis tough and water-resistant to protect against dehydration and external damage.
C. Appear cyanotic: Cyanosis is a bluish discoloration due to hypoxia, not keratinization.
D. Have been replaced by connective tissue: Keratinized epidermal cells are still part of the skin, whereas connective tissue replacement occurs in scarring or wound healing.
Correct Answer is A
Explanation
A. Non-essential amino acids: Non-essential amino acids are those that the body can synthesize, so they do not need to be obtained from the diet.
B. Fatty acids: Fatty acids are components of lipids, not amino acids, and are unrelated to protein synthesis.
C. Essential amino acids: Essential amino acids cannot be synthesized by the body and must be obtained through diet.
D. Protein: Proteins are made up of amino acids, but the term "non-essential amino acids" specifically refers to individual amino acids that the body can produce.
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