Protein is made of which chemical substance?

Appeared in: IGIMS Staff Nurse - 2018

Explanation

Proteins are large, complex organic molecules essential for the structure and function of all living cells.
They are polymers, meaning they are long chains made up of repeating smaller units.
The fundamental building blocks or monomer units of proteins are amino acids.
There are 20 common amino acids that are linked together by peptide bonds to form polypeptide chains, which then fold into specific three-dimensional protein structures.

Option A: Vitamins are organic micronutrients required for various metabolic reactions; they are not the structural components of proteins.
Option B: Minerals are inorganic elements (e.g., calcium, iron) that serve as cofactors for enzymes and play roles in nerve function and bone structure, but they do not form proteins.
Option C: Fats (lipids) are a separate class of macronutrients composed of fatty acids and glycerol. They are primarily used for energy storage and are components of cell membranes.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Biochemical composition of proteins as background academic context rather than a clinical decision trigger.
Adequate dietary protein is crucial for patients' recovery, as it is needed for tissue repair, wound healing, and synthesizing antibodies to fight infection.
Nurses monitor patients' protein status through lab values like serum albumin. Low albumin levels can indicate malnutrition and may affect how the body handles medications and fluids.
What if a patient has chronic kidney disease? Their protein intake is often restricted. In this case, the nurse must educate the patient on consuming high-quality protein in limited amounts to minimize the production of nitrogenous waste products that the kidneys cannot filter effectively.

How to Approach the Question

First, identify the core subject of the question, which is the basic chemical structure of a protein.
This is a factual recall question from basic biology or biochemistry.
Recall the three main macronutrients: proteins, carbohydrates, and fats.
Remember the basic building blocks for each: proteins are made of amino acids, carbohydrates are made of monosaccharides (sugars), and fats are made of fatty acids and glycerol.
Evaluate the given options. Vitamin, Mineral, and Fat are all distinct nutrient categories, not the building blocks of protein.
Select 'Amino acids' as it is the correct fundamental unit of a protein.

Concept Tested & Keywords

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E6 Parks TextBook of Preventive & Social Medicine part 2 — Subpart A (pp 1-232 of 464) p. 144-146

E6 Nursing Fundamentals Potter Perry 12e Part 5 p. 180-182

E6 Biochemistry U Satyanarayana— Part 1 (pp 26-420 of 840) p. 32-34

Practise the full IGIMS Staff Nurse - 2018

Attempt every question from this paper in a timed mock, then review the full solution for each one.