Microbiology - Micro Organisms - Discussion

I think option A is the correct answer.

Option B is also correct, in both of them EF 2 in translation is inhibited by Diphtheria toxin.

Please explain. Which one is correct?

In eubacteria and archaea both are prokaryotes. Nuclear membrane is absent. Transcription and translation occur simultaneously. Answer A also seems to be correct.

Every amino acid (except glycine) can occur in two isomeric forms, because of the possibility of forming two different enantiomers (stereoisomers) around the central carbon atom. By convention, these are called L- and D- forms, analogous to left-handed and right-handed configurations.

Only L-amino acids are manufactured in cells and incorporated into proteins. Some D-amino acids are found in the cell walls of bacteria, but not in bacterial proteins.

Glycine, the simplest amino acid, has no enantiomers because it has two hydrogen atoms attached to the central carbon atom. Only when all four attachments are different can enantiomers occur.

I think option A is right answer in nature only L form of amino acids are found except some meteorites which possess d-form amino acids.

Most amino acids are L form in nature. How is it possible Option C "proteins are synthesized from D-, rather than L-, isomers of amino acids"?

Please explain.