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Answer to Question #9081 in Biochemistry for Daisy

Question #9081
Explain how an animal that persists on a diet composed of 90% protein, 7% fat, and 3% carbohydrate utilizes food of this composition to maintain itself and grow
Expert's answer
This diet is unusual for animals and results in numerous changes
metabolism. Carbohydrates (a usual source of energy for animal)
very few in this diet, thus carbohydrates cannot serve as a
energy source. Thus, energy is extracted from proteins. 1g of
contain almost the same amount of energy as 1g of
however digestion of proteins is much more difficult. In the
and intestine proteins are split to aminoacids; this aminoacids go
every cell of the organism through the blood. Decomposing of
involves complicated system of chemical reactions, the
central part of this
reactions is citric acid cycle. Most of
aminoacids are splitted to acetyl-CoA
and during this process give
energy in form of ATP and NAD(P)H. Next,
acetyl-CoA molecules can
serve as a source of energy (in the citric acid
cycle) or can be used
as building blocks for creating lipids and
carbohydrates that are
necessary for organism. Thus, in this case proteins
perform functions
normally attributed to carbohydrates and lipids. Finally,
lipids from
food become building blocks for steroid hormones, eicosanoids
specific intra-cellular lipids.

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