1. Enzymes and transport proteins are globular proteins. 2. Fibrous proteins are

Question

1. Enzymes and transport proteins are globular proteins.

2. Fibrous proteins are typically water-soluble.

3. The amino acids in a protein are "held together" by glycosidic bonds.

4. Amino acids exist in different forms, depending upon the pH of their environment.

5. Amino acids exist as electrically-neutral zwitterions at all pH values.

6. The zwitterion form of an amino acid is overall electrically neutral.

7. At a pH equal to its isoelectric point (pI), an amino acid exists as an electrically-neutral zwitterion.

8. When the pH is lower than the pI of an amino acid, the amino acid will have a net positive charge.

9. When pH is higher than the pI of an amino acid, the amino acid will have a net negative charge.

10. Ala-Cys and Cys-Ala are identical compounds.

Explanation / Answer

1. True.

Enzymes and transport proteins are globular proteins. They have a spherical shape which is contributed by the protein's tertiary structure. They are water soluble. The hydrophobic aminoacids of the proteins aggregate towards the interior protein core while the hydrophilic amino acids form the outer surface of the protein where they ineract with the water surface and other molecules.

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