A. Yes this is a homework question.
B. No, I don’t want you to do it for me.
C. Please just say yes or no.
D. IF I am right, and ONLY if I am right, feel free to add any tidbits that you think might be interesting.
E. If I’m wrong, please don’t tell me the answer. BUT, please feel free to tell me if I’m totally off track.
So, the question is:
What would you expect to find when looking through an SEM at a cell treated with an enzyme that cleaves proteins at their hydrophilic amino acids.
A) a cell surface that is devoid of any major structures
B) a cell surface covered with polysaccharides
C) a cell surface coated with hydrophilic proteins
D) a cell surface coated with lipids and polysaccharides
E) a cell surface without its outer phospholipid bilayer
I chose D and here’s my reasoning:
The enzyme only affects proteins at their hydrophilic amino acids. The phospholipid bilayer has embedded proteins. These proteins have hydrophilic parts exposed to the outer environment and hydrophobic parts safe and sound in between the layers with the hydrophobic tails of the bilayer.
Carbohydrates attach to the phospholipid layer to form glycolipids. Carbohydrates also attach to the proteins to form glycoproteins.
So, if the enzyme is only chopping off the heads of the proteins at their hydrophilic (exterior) parts, the carbs will get chopped off as well. But, the glycolipids will be unaffected. So, the cell surface will be covered with glycolipids (glycolipids=carbs+lipids=polysaccharides+lipids).
So, am I right or do I need to go back to the drawing board?