Which of these is not true?

Actin filaments are in muscle cells

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Motor molecules use microtubules as tracts

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Intermediate filaments sometimes contain keratin

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Microtubules radiate out from the ER

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Solution

The correct option is D Microtubules radiate out from the ER
Microtubules radiate out from the centrosome to provide the basic organization of the cytoplasm, including the positioning of organelles.
Hence, the correct answer is 'Microtubules radiate out from the ER'.

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Which of these is not true?

The correct option is D Microtubules radiate out from the ERMicrotubules radiate out from the centrosome to provide the basic organization of the cytoplasm, including the positioning of organelles.Hence, the correct answer is 'Microtubules radiate out from the ER'.

The correct option is D Microtubules radiate out from the ER
Microtubules radiate out from the centrosome to provide the basic organization of the cytoplasm, including the positioning of organelles.
Hence, the correct answer is 'Microtubules radiate out from the ER'.