Proteins have _ levels of organization.
Correct answer: C. Four
- A. Two
- B. Three
- C. Four
- D. Five
Explanation
The four levels of protein structure are: Primary structure: The linear sequence of amino acids in a protein.Secondary structure: Local folding into structures such as alpha helices and beta sheets, stabilized by hydrogen bonds.Tertiary structure: The overall three-dimensional shape of a single polypeptide chain, stabilized by various interactions between side chains.Quaternary structure: The arrangement of multiple polypeptide chains into a functional protein complex. Not all proteins have quaternary structures, but those that do, like hemoglobin, require this level of organization.Options A and B are incorrect because they do not account for all the structural levels up to quaternary. Option D is incorrect because there is no recognized fifth level of protein structure.
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About Biological Molecules
The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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