Which of these are the basic units or building blocks of living organisms?

Appeared in: AIIMS Raipur NO - 2019 (Shift-2)

Explanation

Cells are the basic structural and functional units of all tissues, organs, and systems in the human body.
According to the cell theory, all living organisms are composed of cells, and all cells arise from pre-existing cells.
Each cell can carry out the essential processes of life, such as metabolism, growth, and reproduction, making it the smallest unit of life.
Groups of specialized cells form tissues, which in turn form organs and organ systems, demonstrating a clear hierarchical organization.

Option A: An enzyme is a complex protein molecule that functions as a biological catalyst to speed up chemical reactions. It is a component within a cell, not the basic building block of the entire organism.
Option B: A proton is a positively charged subatomic particle found in the nucleus of an atom. It is a fundamental component of matter, not a living entity or the basic unit of an organism.
Option D: A neutron is a neutral (uncharged) subatomic particle also found in the nucleus of an atom. Like a proton, it is a building block of matter, not of life.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain The fundamental structural and functional unit of living organisms as background academic context rather than a clinical decision trigger.
Understanding the cell as the basic unit of life is fundamental to pathology. Diseases like cancer are characterized by uncontrolled cell division and growth.
Many diagnostic tests in nursing, such as cytology (e.g., Pap smear), involve examining cells to detect abnormalities, infections, or cancer.
Pharmacology is based on how drugs interact with cells to produce a therapeutic effect. A nurse must understand cellular physiology to appreciate drug actions and side effects.

How to Approach the Question

First, read the question carefully to identify the core concept being asked. The question asks for the 'basic units or building blocks of living organisms'.
Analyze each option based on your knowledge of basic biology.
Evaluate 'Enzyme': Recall that enzymes are proteins that facilitate reactions, not the primary structural unit.
Evaluate 'Proton' and 'Neutron': Recognize these as subatomic particles, the building blocks of atoms, not living organisms.
Evaluate 'Cells': Recall the definition from cell theory, which states that all living things are made of cells. This directly matches the question.
Conclude that 'Cells' is the only option that fits the definition of the basic structural and functional unit of life.

Concept Tested & Keywords

Concept Tested: The fundamental structural and functional unit of living organisms.
Stem keywords: basic units, building blocks, living organisms
Lead-in keywords: BEST, MOST RELEVANT CLUE

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E6 Anatomy Grays 43e Vol 1 Part 1 p. 23-26

Practise the full AIIMS Raipur NO - 2019 (Shift-2)

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