Category: Class 12
The Levels Of Protein Structure The various levels of protein structural organization are defined as follows. Primary Structure The amino acid sequence is the primary (1°) structure of a …
Protein Proteins are a diverse and abundant class of biomolecules, constituting more than 50% of the dry weight of cells. This diversity and abundance reflect the central role of …
Basic Amino Acids Three of the common amino acids have side chains with net positive charges at neutral pH: histidine, arginine, and lysine. The ionized group of histidine is …
Acidic Amino Acids There are two acidic amino acids – aspartic acid and glutamic acid – whose R groups contain a carboxyl group. Aspartic acid and glutamic acid thus …
Polar, Uncharged Amino Acids The polar, uncharged amino acids except for glycine contain R groups that can form hydrogen bonds with water. Thus, these amino acids are usually more …
Protein – Classification The structures and abbreviations for the 20 amino acids commonly found in proteins are shown in Figure 4.5. All the amino acids except proline have both …
Amino Acids can join via Peptide Bonds The crucial feature of amino acids that allows them to polymerize to form peptides and proteins is the existence of their two …
Structure of a Typical Amino Acid Amino acids in solution at neutral pH exist predominantly as dipolar ions (also called zwitterions). Amino acids can exist as zwitterions – substances …
