Mitochondrial Structure & Variability — NEET Biology
✅ Asked in NEET 2024Mitochondria (sing.: mitochondrion), unless specifically stained, are not easily visible under the microscope. The number of mitochondria per cell is variable depending on the physiological activity of the cells. In terms of shape and size also, considerable degree of variability is observed. Typically it is sausage-shaped or cylindrical having a diameter of 0.2-1.0μm (average 0.5μm) and length 1.0-4.1μm. Each mitochondrion is a double
Mitochondria are double membrane-bound organelles with variable shape, size, and number depending on cell activity level. Students often mistake mitochondria as single-membrane structures or fail to remember the specific dimensions (0.2-1.0 μm diameter, 1.0-4.1 μm length). The key trap is confusing mitochondrial characteristics with other organelles like peroxisomes or endoplasmic reticulum. Remember: mitochondria are always double-membraned (outer and inner), typically sausage or cylindrical-shaped, and their abundance directly correlates with the cell's energy demands—metabolically active cells have more mitochondria.
Given below are two statements: Statement I: Mitochondria and chloroplasts both double membranes bound organelles. Statement II: Inner membrane of mitochondria is relatively less permeable, as compared to chloroplast. Choose the correct answer:
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