The video explores arginine metabolism, focusing on creatine biosynthesis. It covers the mechanisms of glycine aminotransferase and guanidinium acetate methyl transferase, highlighting their roles in creatine synthesis. The video also discusses the regulation and deficiency of glycine aminotransferase, including hormonal influences and feedback inhibition. The importance of creatine in energy metabolism and its supplementation benefits are also addressed.

What is the primary role of creatine in cells?

• To inhibit enzyme activity

• To store high energy gamma phosphate of ATP

• To break down proteins

• To synthesize glucose

Which enzyme is responsible for transferring the amidine group onto glycine?

• Glycine aminotransferase

• Ornithine transcarbamoylase

• Creatine kinase

• Adenosyl methionine synthase

What health issues can arise from a deficiency in glycine aminotransferase?

• Neurological degeneration

• Increased muscle mass

• Improved energy metabolism

• Enhanced cognitive function

Which hormone is known to upregulate glycine aminotransferase?

• Estradiol

• Insulin

• Growth hormone

• Cortisol

How does creatine regulate its own synthesis?

• By promoting protein synthesis

• By enhancing mRNA stability

• By acting as a repressor at the DNA level

• By increasing enzyme activity

Which molecule acts as a feedback inhibitor for glycine aminotransferase?

• Creatine phosphate

• Ornithine

• L-arginine

• ATP

What is the effect of estradiol on glycine aminotransferase?

• It upregulates the enzyme

• It downregulates the enzyme

• It has no effect

• It enhances enzyme activity

What is the role of S-adenosyl methionine in creatine synthesis?

• It serves as a substrate for ATP synthesis

• It acts as a methyl group donor

• It inhibits enzyme activity

• It breaks down creatine

What type of reaction is involved in the transfer of the methyl group to guanidinium acetate?

• SN1 reaction

• E2 reaction

• E1 reaction

• SN2 reaction

What is the final product of the creatine biosynthesis pathway?

• Glycine

• Ornithine

• L-arginine

• Creatine