Historical Discovery of Plasma Membrane — NEET Biology
📚 Practice ConceptThe detailed structure of the membrane was studied only after the advent of the electron microscope in the 1950s. Meanwhile, chemical studies on the cell membrane, especially in human red blood cells (RBCs), enabled the scientists to deduce the possible structure of plasma membrane.
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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