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Q72
(NDA-I/2023)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Official Key
Which one of the following structures or components is not always present in living cells ?
Explanation
In biological science, all living cells share a set of fundamental components essential for survival and reproduction, but the cell wall is not one of them. While plants, fungi, bacteria, and some protists possess a cell wall for structural support and protection, it is completely absent in animal cells and certain bacteria like Mycoplasma.
The other three components are universal to all living cells:
- Plasma membrane: A semi-permeable lipid bilayer that defines the cell boundary and regulates the entry and exit of molecules.
- Cytoplasm: The internal fluid environment where metabolic activities and biochemical reactions take place.
- Genetic material (DNA/RNA): Necessary for storing biological information and directing the synthesis of proteins.
Because animal cells are living cells that function perfectly without a cell wall, Option A is the correct answer.
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