IB Biology Topic B2.2.2: Advantage of the Separation of the Nucleus and Cytoplasm Into Separate Compartments Notes

Nuclear Envelope: Why Separating DNA from Cytoplasm Matters

Eukaryotic cells keep their chromosomes inside the nucleus, enclosed by a double membrane called the nuclear envelope.

This separates transcription (making mRNA from DNA, in the nucleus) from translation (making protein from mRNA, in the cytoplasm).

Pores in the envelope control what enters and exits, letting mRNA pass to the cytoplasm while keeping the DNA protected from molecules that could damage it.

Prokaryotic cells have no nucleus.

Their DNA and ribosomes share the same space, so transcription and translation happen at the same time.
As soon as mRNA is being made, ribosomes begin translating it into protein.

Common Mistake

Students sometimes say prokaryotes "can't do transcription" because they lack a nucleus.
Prokaryotes carry out both transcription and translation.
What they cannot do is separate the two processes or modify mRNA before it is translated.

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IB Biology Topic B2.2.2: Advantage of the Separation of the Nucleus and Cytoplasm Into Separate Compartments Notes

Nuclear Envelope: Why Separating DNA from Cytoplasm Matters

Post-Transcriptional Modification: Processing mRNA Before Translation

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Nuclear Envelope: Why Separating DNA from Cytoplasm Matters

Post-Transcriptional Modification: Processing mRNA Before Translation

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic B2.2.2: Advantage of the Separation of the Nucleus and Cytoplasm Into Separate Compartments Notes

Nuclear Envelope: Why Separating DNA from Cytoplasm Matters

Post-Transcriptional Modification: Processing mRNA Before Translation

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Nuclear Envelope: Why Separating DNA from Cytoplasm Matters

Post-Transcriptional Modification: Processing mRNA Before Translation

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics