Question

What is the role of phosphatidyl-inositol (PI)? How is it activated? What is its structure?

A) Role: Structural Support; Activated by Hydrolysis; Structure: Linear Chain with Amino Group
B) Role: Signaling Molecule; Activated by Phosphorylation; Structure: Ring with Phosphate Group
C) Role: Membrane Anchoring; Activated by Acetylation; Structure: Branched Chain with Inositol Head
D) Role: Enzyme Cofactor; Activated by Ubiquitination; Structure: Cyclic Ring with Phosphate Group

Answer 1

The correct answer is: C) Role: Membrane Anchoring; Activated by Acetylation; Structure: Branched Chain with Inositol Head.

Step-by-step explanation:

The correct answer is: C) Role: Membrane Anchoring; Activated by Acetylation; Structure: Branched Chain with Inositol Head. Phosphatidylinositol (PI) is a phospholipid that plays a crucial role in membrane anchoring and cellular signaling. Its structure consists of a glycerol backbone, two fatty acid chains, a phosphate group, and an inositol head. The inositol head is a cyclic, six-carbon sugar alcohol with several hydroxyl groups. PI is activated by acetylation, a process where an acetyl group is added to modify the molecule. This acetylation can influence its interactions with other proteins and lipids in the cell membrane. PI and its phosphorylated derivatives are involved in various cellular processes, serving as signaling molecules and participating in intracellular communication and membrane dynamics.