OBJECTIVE LIFE SCIENCE
CELL BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They are found in multicellular organisms.
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They contain more than one nucleus.
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They are specialized for movement.
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They do not carry out mitosis.
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Detailed explanation-1: -Certain types of cells / tissues do not conform to a standard notion of what constitutes a cell: Striated muscle fibres: Muscle cells fuse to form fibres that may be very long (>300mm) Consequently, they have multiple nuclei despite being surrounded by a single, continuous plasma membrane.
Detailed explanation-2: -Skeletal muscle cells are long, cylindrical, and striated. They are multi-nucleated meaning that they have more than one nucleus. This is because they are formed from the fusion of embryonic myoblasts. Each nucleus regulates the metabolic requirements of the sarcoplasm around it.
Detailed explanation-3: -To what extent is an organism such as Caulerpa an exception to the cell theory? An organism visible to the naked eye is usually made of millions of cells. Caulerpa