Chapter 18, Problem 18.74AP

Interpretation Introduction

Interpretation:

Example of a protein containing primarily alpha-helices and also identify the protein mentioned is globular or fibrous.

Concept introduction:

Many amino acids are linked together through amide bonds to form a biologically large molecule known to be proteins.

Amino functional group is $(-N{H}_2)$ and carboxyl functional group is $(-COOH)$ and a $R$ group is considered as side chain, when all these are bonded to same carbon atom.

Secondary structure of protein is the repeating structural patterns ($\text{α-helix}$ and $\text{β-sheets}$) formed by hydrogen bonding between backbone atoms of the neighboring segments of protein.

$\text{α-helix}$ is the secondary protein structure in which a protein chain form a right handed coil stabilizes by hydrogen bonds between peptide groups along its backbone.

Fibrous protein is a tough, water insoluble protein whose protein chains form fibers or sheets.

Globular protein is a water soluble protein whose chain is folded in a compact shape.