Micro Organisms
Which of the following sequences has helped in identifying eukaryotes, eubacteria and archeabacterial cell types?

Amino acid sequence
Signal sequence
Signature sequence
Shine-Dalgarno sequence

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Micro Organisms
Eukaryotic cell organelles first emerged

just before the origin of the animal and fungal kingdoms
when bacteria made their first attempts at reproduction
from a specialized lineage of cells within the kingdom Protista
when prokaryotes engulfed each other and became interdependent

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Micro Organisms
A characteristic of protein synthesis in both the archaea and eukarya is

the initiator tRNA is charged with N-formyl-methionine
translation is inhibited by diphtheria toxin
transcription and translation are coupled
proteins are synthesized from D-, rather than L-, isomers of amino acids

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