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Question 3a asks what kind of signalling molecule is insulin, but in the answers, they are talking about phospholipids?
Also in question 3c answers state that insulin is hydrophobic and therefore binds to a cell membrane receptor (i think this is a typo because the notes for that question talk about hydrophilic substances being unable to cross the phospholipid bilayer)
Yep. Looks like there has been some sort of error in compiling the answers - the solution for 3a seems to be answering "What are the components of a phospholipid?". Here's an idea of what an answer for 3a could look like:
Spoiler
Insulin is a (protein) hormone / Insulin is an endocrine signalling molecule
As a reference for anyone using this exam:
-> the provided solution for 11c would suggest that the suspect is innocent