Transaminases 1/Urea Cycle 2

The video tutorial explores the urea cycle, focusing on transaminases and their role in converting carbonyls to amines. It explains the importance of transaminases in amino acid metabolism and biosynthesis. The tutorial also covers the TCA cycle, highlighting the transport of oxaloacetate across the mitochondrial membrane and the aspartate argininosuccinate shunt. The video aims to solidify understanding of these biochemical processes.

What is the primary function of the urea cycle?

• To synthesize proteins

• To eliminate ammonia from the body

• To store energy

• To produce glucose

Which enzyme is responsible for converting carbonyls to amines?

• Carboxylase

• Dehydrogenase

• Transaminase

• Hydratase

What coenzyme is required for the conversion of carbonyls to amines?

• Pyridoxal phosphate

• FADH2

• NADH

• Coenzyme A

Which molecule is converted to oxaloacetate in the TCA cycle?

• Malate

• Pyruvate

• Fumarate

• Citrate

What is the role of phosphoenolpyruvate carboxykinase in gluconeogenesis?

• Converts oxaloacetate to phosphoenolpyruvate

• Converts malate to fumarate

• Converts citrate to isocitrate

• Converts pyruvate to oxaloacetate

Which molecule donates the amine group in the transaminase reaction with oxaloacetate?

• Aspartate

• Alanine

• Glutamate

• Serine

What is the product formed when oxaloacetate is converted by a transaminase?

• Fumarate

• Citrate

• Aspartate

• Malate

What is the significance of the aspartate argininosuccinate shunt?

• It synthesizes proteins

• It connects the urea cycle and TCA cycle

• It produces ATP

• It stores glucose

Which enzyme converts fumarate to malate in the cytosol?

• Malate dehydrogenase

• Fumarase

• Citrate synthase

• Aconitase

How is fumarate transported back into the mitochondria?

• As malate

• As citrate

• As oxaloacetate

• As succinate