PROTEIN AND NITROGEN METABOLISM:
REQUIREMENTS, REGULATION, AND BALANCE
|COMPLETE STUDY GUIDE WITH 100% ACCURATE
QUESTIONS &ANSWERS. EXCELLENCE
GUARANTEED.
What is the main takeaway regarding protein metabolism? Answer: It involves a
constant balance between synthesis and degradation, regulated by hormones and
cellular energy status.
What is the Recommended Dietary Allowance (RDA) for protein? Answer: Previously
0.8 grams per kilogram (g/kg), now suggested to increase to 1.2-1.6 g/kg.
What are the primary sources of amino acids in the blood? Answer: Approximately 100
g/day from dietary protein and about 300 g/day from breakdown of existing body
protein.
What is the predominant use of amino acids from the amino acid pool? Answer: To
build new body protein (protein turnover).
What happens to amino acids during deamination? Answer: The nitrogen piece is
removed, and the remaining carbon skeleton is used for energy, glucose production, or
fatty acids.
Define protein turnover. Answer: The constant process of protein synthesis (building)
and degradation (breaking down).
What is the purpose of protein turnover? Answer: To degrade non-functional proteins
and adapt the relative amounts of proteins to physiological/nutritional situations.
Which proteins have a quick turnover rate? Answer: Mucosal layer, skin, and blood
proteins.
What is the turnover rate for PEPCK (Phosphoenolpyruvate Carboxykinase)? Answer:
Approximately 3.3% turnover per day.
What occurs during transcription in protein synthesis? Answer: RNA polymerase II
transcribes DNA into mRNA, which is then processed and sent to the cytoplasm.
1
APPHIA - Crafted with Care and Precision for Academic Excellence.
REQUIREMENTS, REGULATION, AND BALANCE
|COMPLETE STUDY GUIDE WITH 100% ACCURATE
QUESTIONS &ANSWERS. EXCELLENCE
GUARANTEED.
What is the main takeaway regarding protein metabolism? Answer: It involves a
constant balance between synthesis and degradation, regulated by hormones and
cellular energy status.
What is the Recommended Dietary Allowance (RDA) for protein? Answer: Previously
0.8 grams per kilogram (g/kg), now suggested to increase to 1.2-1.6 g/kg.
What are the primary sources of amino acids in the blood? Answer: Approximately 100
g/day from dietary protein and about 300 g/day from breakdown of existing body
protein.
What is the predominant use of amino acids from the amino acid pool? Answer: To
build new body protein (protein turnover).
What happens to amino acids during deamination? Answer: The nitrogen piece is
removed, and the remaining carbon skeleton is used for energy, glucose production, or
fatty acids.
Define protein turnover. Answer: The constant process of protein synthesis (building)
and degradation (breaking down).
What is the purpose of protein turnover? Answer: To degrade non-functional proteins
and adapt the relative amounts of proteins to physiological/nutritional situations.
Which proteins have a quick turnover rate? Answer: Mucosal layer, skin, and blood
proteins.
What is the turnover rate for PEPCK (Phosphoenolpyruvate Carboxykinase)? Answer:
Approximately 3.3% turnover per day.
What occurs during transcription in protein synthesis? Answer: RNA polymerase II
transcribes DNA into mRNA, which is then processed and sent to the cytoplasm.
1
APPHIA - Crafted with Care and Precision for Academic Excellence.
