**Core Concept**
Globular proteins are a class of proteins characterized by a compact, roughly spherical shape, which allows them to perform a variety of biological functions. These proteins typically have a hydrophobic core and a hydrophilic exterior, enabling them to interact with other molecules and tissues. Examples of globular proteins include enzymes, hormones, and antibodies.

**Why the Correct Answer is Right**
Myosin is a type of cytoskeletal protein that plays a crucial role in muscle contraction. Unlike globular proteins, myosin has a long, fibrous structure, typically consisting of two heavy chains and multiple light chains. This elongated shape allows myosin to interact with actin filaments and generate force for muscle contraction. The correct answer, myosin, is a structural protein with a distinct filamentous structure, making it an exception among the options listed.

**Why Each Wrong Option is Incorrect**
**Option A:** Prolamines are a type of globular protein found in plants, particularly in the seeds of cereals. They are rich in proline and glutamine residues, which contribute to their compact, globular structure.
**Option B:** Albumin is a globular protein found in blood plasma, responsible for maintaining osmotic pressure and binding various substances, such as hormones and drugs. Its globular shape enables it to interact with other molecules and tissues.
**Option C:** Globulin is a general term for a group of globular proteins found in blood plasma, including antibodies and certain clotting factors. These proteins are characterized by their compact, spherical shape and play critical roles in the immune system and blood coagulation.

**Clinical Pearl / High-Yield Fact**
When distinguishing between globular and fibrous proteins, remember that globular proteins typically have a high proportion of hydrophobic amino acids in their core and hydrophilic amino acids on their surface, whereas fibrous proteins, such as myosin, have a distinct, elongated structure that allows them to interact with other molecules and tissues.

**✓ Correct Answer: D. Myosin**