Cell Structure & Organelles MCQs with Answers

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The fluidity of biological membranes is maintained by phospholipids, which form a dynamic lipid bilayer with hydrophobic tails and hydrophilic heads.

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Energy is required for active transport, which moves molecules against their concentration gradient.

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The semifluid protein-containing matrix inside the double membrane of a chloroplast is called the Stroma.

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A cell shrinks when placed in a hypertonic medium because water moves out of the cell by osmosis.

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Plastids having color other than green are called Chromoplasts.

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The plasma membrane is predominantly composed of phospholipids, which form a characteristic bilayer structure.

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Bacterial membranes in prokaryotic cells are composed of proteins and phospholipids.

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Ribosomes are the centre for protein synthesis in the cell.

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Endoplasmic reticulum is lacking in Bacteria because bacteria are prokaryotic cells that lack membrane-bound organelles.

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Skeletal muscle cells have more SER (Smooth Endoplasmic Reticulum) and less RER (Rough Endoplasmic Reticulum) because SER is specialized for calcium ion storage and release, which is essential for muscle contraction.