The video explains the conversion of phosphatidic acid into phospholipids, focusing on the synthesis of phosphatidyl choline, ethanolamine, and serine. It highlights the activation of head groups and the role of cytosine nucleotides. The video also discusses the interconversion of phospholipids and the unique metabolic pathways of choline.

What is the role of CDP in the activation of DAG?

• It provides energy for the reaction.

• It acts as a catalyst.

• It deactivates DAG.

• It activates DAG by binding to it.

What is the significance of using CTP in lipid biosynthesis?

• It is used for energy production.

• It is used to activate molecules.

• It is used to deactivate molecules.

• It is used for bio signaling.

Which enzyme is responsible for phosphorylating choline?

• Choline phosphatase

• Choline kinase

• Choline transferase

• Choline synthase

What is the final product of the reaction catalyzed by CDP choline, DAG, choline phosphotransferase?

• Diacylglycerol

• Phosphatidyl ethanolamine

• Phosphatidyl serine

• Phosphatidyl choline

How is phosphatidyl ethanolamine converted to phosphatidyl choline?

• By methylating the ethanolamine group

• By removing a methyl group

• By adding a phosphate group

• By decarboxylating the ethanolamine group

Which of the following is NOT a fate of phosphatidyl ethanolamine?

• Conversion to phosphatidyl serine

• Incorporation into membranes

• Conversion to triglycerides

• Conversion to phosphatidyl choline

What is the role of phosphatidyl serine synthase?

• It removes ethanolamine and adds serine.

• It converts phosphatidyl serine to phosphatidyl ethanolamine.

• It methylates serine.

• It adds a phosphate group to serine.

Which enzyme can convert phosphatidyl serine back to phosphatidyl ethanolamine?

• Phosphatidyl serine synthase

• Phosphatidyl serine decarboxylase

• Phosphatidyl choline transferase

• Phosphatidyl ethanolamine kinase

What is the main difference in the strategy for synthesizing phosphatidyl choline compared to phosphatidyl ethanolamine?

• Phosphatidyl choline synthesis involves dephosphorylation.

• Phosphatidyl choline synthesis involves phosphorylation.

• Phosphatidyl choline synthesis involves methylation.

• Phosphatidyl choline synthesis involves decarboxylation.

What will be discussed in the next video regarding choline?

• Its role in bio signaling

• Its role in energy production

• Its degradation and metabolism

• Its synthesis