Who showed that the nuclear membrane has many pores or circular structures or annuli?

Fawcell

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Strasburger

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Butchen

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Callan and Tomlin

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Solution

The correct option is C Callan and Tomlin
The nucleus is surrounded by a double membrane bearing many pores. These pores are important for cytoplasm-nucleoplasm communication and exchange of materials. Nuclear pores have diaphragms, septa annuli, microspores for movement of substances between nucleus and cytoplasm. The nuclear pore complex was first described by Callan and Tomlin.

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Explain each point– nucleolus, chromatin, nucleoplasm, nuclear membrane and nuclear pores. Give their one function.

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