JanaALEVEL
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1.Do all animal cells have DNA or RNA ?
2.Do all animal cells have an endoplasmic reticulum and a Golgi body ?
3.Is the endoplasmic reticulum always attached to the nuclear membrane in those cells which have a nucleus ?
4.There are free ribosomes in the cytoplasm of a cell and there are ribosomes attached to the ER, do these have different functions?
5.The nucleus has a double membrane and this double membrane has "pores" , are these pores selective ? Are they just gaps in the bilipid layer or are they more like channel proteins ?
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novasae
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1. All animal cells have DNA, which is used (transcribed) to produce RNA. RNA can be translated into proteins, but it has a variety of other functions including making up ribosomes, and regulating gene expression.

2. Tempted to say yes, but frankly there are no 100%s in biology lol. but the ER and Golgi body are membrane bound organelles and are typical in eukaryotes.

3. No - there are multiple types of ER, rough and smooth. Smooth ER is present elsewhere in the cell and is used for things like manufacturing steroids/hormones, which the rough ER is continuous with the nuclear membrane (though does contain some smooth sections iirc) and contains ribosomes.

4. no.

5. the only way the nuclear pores are selective is by their size - they are big enough for mRNA and ribosomal subunits to escape, but not chromosomes
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JanaALEVEL
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z`

(Original post by novasae)
1. All animal cells have DNA, which is used (transcribed) to produce RNA. RNA can be translated into proteins, but it has a variety of other functions including making up ribosomes, and regulating gene expression.

2. Tempted to say yes, but frankly there are no 100%s in biology lol. but the ER and Golgi body are membrane bound organelles and are typical in eukaryotes.

3. No - there are multiple types of ER, rough and smooth. Smooth ER is present elsewhere in the cell and is used for things like manufacturing steroids/hormones, which the rough ER is continuous with the nuclear membrane (though does contain some smooth sections iirc) and contains ribosomes.

4. no.

5. the only way the nuclear pores are selective is by their size - they are big enough for mRNA and ribosomal subunits to escape, but not chromosomes
Thank you but just so I get this for sure, the RER is an extension of the nuclear membrane and the SER is either an extension of the RER or it could be found alone ?
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novasae
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yeah.
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