Cell Size, Shape and Function — NEET Biology
📚 Practice ConceptThe largest isolated single cell is the egg of an ostrich. Among multicellular organisms, human red blood cells are about 7.0 μm in diameter. Nerve cells are some of the longest cells. Cells also vary greatly in their shape. They may be disc-like, polygonal, columnar, cuboid, thread like, or even irregular. The shape of the cell may vary with the function they perform.
Which of the above statements are NOT correct? S1: Mycoplasmas, representing the smallest known cells, are eukaryotic organisms that lack a cell wall. S2: The irregular shape of human White Blood Cells (WBCs) indicates that cellular shape is always independent of the specific function a cell performs. S3: Nerve cells are among the longest cells, and their elongated structure directly aids in the rapid transmission of nerve impulses across long distances. S4: All living organisms are composed of cells, and a semi-fluid matrix, the cytoplasm, is an essential component present in both prokaryotic and eukaryotic cells. S5: Centrosomes, non-membrane bound organelles, are found in animal cells and are primarily involved in the synthesis of lipids and steroidal hormones.
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