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.
Answers

Question

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.
Answers

Quizplus · Accepted Answer

All known nitrogen-fixing cells are prokaryotic microorganisms. Animals rely on their dietary intake of protein and nucleic acids as sources of useful nitrogen. However, only 9 of the 20 amino acids that make up proteins and none of the nucleotides that make up nucleic acids are essential; the remainder can be synthesized from other ingredients in the diet. When amino acids in our body are degraded, their nitrogen atoms eventually appear in urea molecules which are excreted.

Indicate True (T) and False (F) Statements Below Regarding the Cellular