Explain the different degrees of skin burns (first, second and third) and how they differ from each other. And mention the consequences related to the different stages of skin burns. And, explain why Second-degree skin burn is more painful than third-degree skin burn? Explain what causes biological membranes to be fluid and what role cholesterol plays in modulating fluidity

2 . A membrane protein (MW 150 KDa) crosses the plasma membrane once and has an extracellular amino terminus, and a carboxylic acid terminus in the cytoplasm. Based on your knowledge of membrane structure predict which of the following amino acids (alanine, leucine, methionine, serine and valine) would NOT be expected to be in the region of the protein located within the membrane. Name the particular amino acid and explain your reasoning

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