Question

For each of the following indicate whether the individual folded polypeptide chain forms a globular (G) or fibrous (F) protein molecule.

1) keratin
2) lysozyme
3) elastin
4) collagen
5) hemoglobin
6) actin (monomer)

Answer 1

Globular proteins fold back on themselves to form compact shapes, while fibrous proteins have parallel polymer chains. Hemoglobin is a globular protein, but the nature of actin cannot be determined without additional information.

Step-by-step explanation:

Globular proteins are ones that fold back on themselves to produce compact, nearly spherical shapes. They are typically water soluble and have a wide variety of functions, such as enzymes, hormones, and substances like hemoglobin that transport molecules within the body. On the other hand, fibrous proteins have long polymer chains that are arranged parallel to each other, resulting in tough, insoluble materials found in structural tissues like tendons and bone.

In the context of the question, hemoglobin is a globular protein since it has a compact, nearly spherical shape and is water soluble. Actin is not mentioned in the provided information, so it is impossible to determine whether it forms a globular or fibrous protein molecule. More information would be needed to answer this question accurately.