Biology / Unit 2 Bio 0263 short lesson, about 20 seconds
The Nucleus and Nuclear Envelope
Captions available
The idea
The nucleus houses a eukaryotic cell's DNA and directs ribosome and protein synthesis, enclosed by a double-membrane nuclear envelope studded with pores.
In practice
Nuclear pores control passage of ions, molecules, and RNA between the nucleoplasm and the surrounding cytoplasm.
Where people slip
The nuclear envelope is two phospholipid bilayers, not one — an inner and an outer membrane, continuous with the endoplasmic reticulum.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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