Describe why translation of an mrna can start before transcription of the mrna is complete in prokaryotes but not in eukaryotes.

Explanation:

1. Prokaryotes do not have nucleus, so both transcription and translation occurs in the cytoplasm, therefor translation start before the completion of transcription.

2. While in eukaryotes, they have true nucleus, and there protein synthesis machinery (ribosomes) and  is situated in the cytoplasm.

So in eukaryotes transcription occurs in the nucleus, and after the completion of transcription, mRNA is processed and finally export into cytoplasm for translation.

i got something better   a catchphrase here it is

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what the squwock

explanation:

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus