8. Which of the following amino acids has a net charge of +2 at low pH? Which has a net charge of -2 at high pH? Asp, alanine, R, glutamic acid, Leu, lysine.
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.
![8. Which of the following amino acids has a net charge of +2 at low pH? Which has a net
charge of -2 at high pH? Asp, alanine, R, glutamic acid, Leu, lysine.
9. Identify the polar amino acids, the aromatic amino acids, and the sulfur containing amino
acids, given a peptide with the following amino acid sequence:
Val - Met - Ser - Ile - Phe - Arg-Cys- Tyr- Leu
10. Predict the predominant ionized forms of the following amino acids at pH 2.0: glutamic
acid, Leu, threonine, His, and arginine.
11. Draw structures of the following amino acids, indicating the charged form that exists at
pH 4; histidine, asparagine, tryptophan, proline, and tyrosine.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F504d6c06-b9bb-4841-aecf-51552e127e3b%2F3484340c-d09a-4105-ad9c-67244fd4821a%2F1626qlp_processed.jpeg&w=3840&q=75)
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