Which is the most accurate description of this type of cell ?

Which of the following happened during the precambrian era? the first prokaryotic cells the first eukaryotic cells development of photosynthesis all of the above

What gases are carried by the blood

Mrna: gcuaauguc what amino acids does the mrna above code for? what type of amino acids or function are uag, uga, and uaa coding for? which codon (3 letters) signals translation to start and also codes for the amino acid methionine (met)?