protein Insulin (also see Fig 14.24) Ferritin Myoglobin Hemoglobin Ribonuclease a-keratin Collagen Has intramolecular disulfide bond(s) Every third residue is a glycine Globular Fibrous protein Rich in protein a helices and B turns Rich in a helices only Has helical polypeptide chain (not a helices)
Check off the characteristics that describe each protein structure.
Insulin is a protein hormone, and its structure is quite fascinating. It's made up of two chains of amino acids linked together. These two chains are called the A chain and the B chain. Together, they form the insulin molecule. They are arranged in a specific sequence to give insulin its unique structure and function. To make things even more interesting, insulin has two sulfur bridges that help hold its shape together. These bridges are tiny molecular bonds that help keep the A and B chains connected.
Ferritin is a protein found in your body that plays a crucial role in storing and releasing iron. Its structure is quite interesting and important for its function. Ferritin is made up of 24 subunits, which come together to form a spherical protein complex.
Myoglobin is a protein found in muscle cells, and its structure is crucial for its role in storing and transporting oxygen within muscle tissues. Here's a simplified description of its structure:
Protein Chain: Myoglobin is made up of a single chain of amino acids. The chain folds and twists into a specific three-dimensional shape.
Heme Group: At the core of myoglobin's structure, there's a special molecule called a heme group. This heme group contains an iron atom (Fe²⁺) at its center, which can bind to oxygen.
Globular Structure: The protein chain wraps around the heme group, creating a globular or spherical structure. This globular structure is important because it protects the iron atom and allows myoglobin to function effectively.
Hemoglobin is a complex protein found in red blood cells, and its structure is essential for its role in transporting oxygen from the lungs to the body's tissues and carrying carbon dioxide back to the lungs for exhalation.
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