Indicate true (T) and false (F) statements below regarding the cellular metabolism of nucleotides and amino acids. Your answer would be a four-letter string composed of letters T and F only, e.g. TTTT.
( ) Nitrogen fixation occurs in the mitochondria in most animal cells to generate amino acids.
( ) All 20 natural amino acids must be provided in our diet and are therefore "essential."
( ) There are NO essential nucleotides that must be provided in the diet.
( ) Catabolism of amino acids in our body leads to the production of urea which is excreted.
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