Which of the following is a characteristic feature of a carrier protein in a plasma membrane? a. it is a peripheral membrane protein. b. it exhibits a specificity for a particular type of molecule. c. it requires the expenditure of cellular energy to function. d. it works against diffusion. e. it has few, if any, hydrophobic amino acids.

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consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.

the endomembrane system i think