In Nature, you have 2 forms of amino acids. One is the L-form. Which is biologically active. The D-form is abiological poison. The mixture has equal parts of these 2 forms. So. they do not work. The D-form will will inhibit any further activity.
Right. When you have an equal mix of both, that's called a "racemic" mixture.
But natural, inorganic processes exist that can seperate the one from the other. So amino handedness isn't really an obstacle to abiogenesis.
The D-form will will inhibit any further activity.
Well, only in a living thing that is developing L-handed proteins. Now, granted, that's every living thing on Earth, but there's no reason you couldn't have an organisms based on mirror-image chemistry, using d-handed aminos to make d-handed proteins. It's rather arbitrary, in fact. The fact that all living things share this mostly arbitrary handedness is a powerful evidence for common ancestry.
For protein sysnthesis to occur,. all 20 amino acids must exist.
Well, that's not true. Functional protiens can be assembled from a "palette" limited to as little as 8 different amino acids.
Unless you are a chemist, it is hard to understand why it cannot happen.
What makes you think we're not chemists? What makes you think I don't have a whole shelf of graduate-level biochem texts sitting on my bookshelf?