In the given diagram showing the tertiary structure of a protein, the disulfide bond is shown by the letter:

1. A
2. B
3. C
4. D
In the tertiary structure of a globular protein, where do you expect to find the amino acids serine and alanine?
| 1. | Serine would be in the interior, and alanine would be on the exterior of the globular protein. |
| 2. | Alanine would be in the interior, and serine would be on the exterior of the globular protein. |
| 3. | Both serine and alanine would be in the interior of the globular protein. |
| 4. | Both serine and alanine would be on the exterior of the globular protein. |