23. In the structure below, the shaded areas H Ca H Ca H a) are unable to freely rotate around the C-N bond b) represent resonance structures c) represent a partial double bond between C and N d) all of the above H Ca.
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Proteins are biomolecules which are made up of amino acids joined together by a peptide bond. A peptide bond is formed by a reaction called the condensation reaction. By this reaction, a CO-NH bond is formed which is also known as the peptide bond. In the biological system, proteins have different functions such as they act as enzymes, the structural material of the cells, transport, immunity and regulation.
Proteins differ from each other because of the difference in the spatial configuration, amino acid composition, location and function. There are four types of protein structure: primary structure, secondary structure, tertiary structure and quaternary structure.
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