"Transparent" is an exaggeration. If the mirror components were abundant, some bacteria would have learn to eat it, and we would have a chiral war. (Perhaps this happened, and we won!)

For example from https://en.wikipedia.org/wiki/Amino_acid

> These are all L-stereoisomers ("left-handed" isomers), although a few D-amino acids ("right-handed") occur in bacterial envelopes, as a neuromodulator (D-serine), and in some antibiotics.

> Although D-isomers are uncommon in live organisms, gramicidin is a polypeptide made up from mixture of D- and L-amino acids. Other compounds containing D-amino acids are tyrocidine and valinomycin.

Some bacteria can produce the D- version of the amino acids, and use them in peptides that are natural antibiotics because other bacteria don't know how to destroy them. (Anyway, some other bacteria can are resistant, because they developed a way to destroy them.)

Proteins, DNA, and other life structures could be mirrored, but sunlight, minerals, water, and acids can't, and right-handed life has already monopolized them.