Which intermediate compound is involved in the synthesis of amino acids

Which intermediate of Krebs cycle is used as a substrate for amino acid biosynthesis :-

Which of the following compounds Miller-Urey used in the experimental synthesis of amino acids?

Name the nucleic acid in nucleolar organizer which is involved in the synthesis of ribosomal RNA is

Name the nucleic acid in nucleolar organizer which is involved in the synthesis of ribosomal RNA is

Insulin is a protein.It includes 17 of the 20 different amino acids.What is the minimum number of tRNA molecules involved in the synthesis of insulin?

The intermediate species involved in the acid catalysed dehydration of alcohol is

Name the amino acids involved in urea cycle.