Biology questions!!!?

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s4bz1991

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Q1. what is the source of ribosomal RNA (rRNA)?
Q2. some ribosomes are free in cytosol; some are attached to endoplasmic reticulum. What is the significance of this difference?
Q3. how is the hydrogen peroxide produced in cellualr metabolism?

Please help and I will give top points!! Thank you
 
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