What is a key difference between alpha helices and beta sheets? An alpha helix is composed of two or more polypeptide strands, but a beta sheet is composed of a single polypeptide strand. In an alpha helix hydrogen-bonded amino acids are 4 amino acids apart in the primary sequence, but in a beta sheet hydrogen-bonded amino acids may be many amino acids apart in the primary sequence. In an alpha helix hydrogen bonding occurs between amino acid carbonyl and amino groups, but in a beta sheet covalent bonding between amino acid carbonyl and amino groups occurs. Turns and loops can link two alpha helices, but not two beta sheets.
Neutral Amino Acids
Amino acids which do not have any charge on them are neutral amino acids.
Globular Protein
The globular proteins refer to the shape of protein specifically spherical in nature apart from spherical form fibrous, disordered and membrane-bound proteins exist. These globular proteins are miscible in water and form a colloidal solution rather than other types which might not exhibit solubility. Many classes of the fold are found in globular proteins, which render them a sphere shape. Globular fold containing proteins usually are referred to by the term globin.
Dimer
Dimers are basic organic compounds, which are derivates of oligomers. It is formed by the combination of two monomers which could potentially be strong or weak and in most cases covalent or intermolecular in nature. Identical monomers are called homodimer, the non-identical dimers are called heterodimer. The method by which dimers are formed is known as “dimerization”.
Dipeptide
A dipeptide is considered a mixture of two distinct amino acids. Since the amino acids are distinct, based on their composition, two dipeptide's isomers can be produced. Various dipeptides are biologically essential and are therefore crucial to industry.
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