A Protein Contains a Section Partially Embedded in a Cell

question 241

Multiple Choice

A protein contains a section partially embedded in a cell membrane and another section that extends out into the external environment.Which statement could be true about this protein?

• A) The protein is composed of a chain of alternating hydrophobic and hydrophilic amino acids.
• B) The protein is composed of a chain with a long stretch of hydrophobic amino acids and then another stretch of hydrophilic amino acids.
• C) The protein has two subunits, each containing alternating hydrophobic and hydrophilic amino acids.
• D) The protein is composed of either all hydrophobic amino acids or all hydrophilic amino acids, but not both.
• E) The protein is composed of a mix of hydrophobic amino acids and hydrophilic amino acids covalently modified and so converted to hydrophobic residues.

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