Question

question 49
the metabolism of proteins:
requires deamination before entry into glycolysis.
produces much less atp than carbos or fats.
none of the above.
produces large amounts of toxic nitrogenous byproducts.
all of the above.

Explanation:

• Deamination before glycolysis: Proteins are broken down into amino acids. Amino acids undergo deamination (removal of the amino group) before their carbon - skeletons can enter glycolysis or the citric acid cycle.
• ATP production: Proteins can produce a significant amount of ATP. In fact, on a per - gram basis, proteins can produce a similar amount of ATP as carbohydrates. Fats produce more ATP per gram than both proteins and carbohydrates.
• Nitrogenous by - products: The deamination of amino acids produces ammonia (\(NH_3\)), which is toxic. In mammals, it is converted to urea (less toxic) in the liver.
• Since all the statements (requires deamination before entry into glycolysis, produces large amounts of toxic nitrogenous byproducts) are correct.

Answer:

all of the above.