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Which of the following is the structural and functional unit of an organism?
Nucleus
Mitochondria
ATP
Cell
Cell
The cell is the basic structural, functional, and biological unit of all known living organisms. It is the smallest unit of life that can replicate independently, and cells are often called the 'building blocks of life'.
The cell is the basic structural, functional, and biological unit of all known living organisms. It is the smallest unit of life that can replicate independently, and cells are often called the 'building blocks of life'.
Think of a cell like a single brick in a massive skyscraper; while the brick is just one small unit, the entire structure depends on the integrity and organization of millions of these bricks working together.
C.B.L. - Cell is the Building block of Life.
C6тАЛH12тАЛO6тАЛ+6O2тАЛтЖТ6CO2тАЛ+6H2тАЛO+Energy┬а(ATP) тАФ General equation for cellular respiration.
Cells function as organized biochemical factories containing genetic material (DNA or RNA) and organelles that perform specific metabolic tasks. Through processes like cellular respiration, represented by C6тАЛH12тАЛO6тАЛ+6O2тАЛтЖТ6CO2тАЛ+6H2тАЛO+ATP, cells convert nutrients into chemical energy to sustain life activities.
Cell theory states all living organisms are composed of one or more cells.
Robert Hooke first discovered cells in 1665 using a primitive microscope.
All cells arise from pre-existing cells via cell division (Omnis cellula e cellula).
Allows for compartmentalization of biochemical reactions.
Facilitates specialization through cellular differentiation in multicellular organisms.
Biotechnology and genetic engineering.
Medical research for treating cellular diseases like cancer.
The human body contains roughly 3.7├Ч1013 cells.
Option A (Nucleus) is the control center; Option B (Mitochondria) is the powerhouse; Option C (ATP) is the energy currency molecule; none are the complete structural unit.
D is correct тАФ The cell is the fundamental unit of structure and function for all living organisms.
Always distinguish between the 'unit of structure' (Cell) and the 'unit of energy' (ATP) or 'control center' (Nucleus) to avoid common confusion in Biology MCQs.
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