Select the true statements about protein secondary structure.
a. in a β‑pleated sheet, the side chains extend above and below the sheet.
b. peptide bonds stabilize secondary structure.
c. the β‑pleated sheet is held together by hydrogen bonds between adjacent segments.
d. in an α‑helix, the side chains are located inside the helix.
e. the secondary level of protein structure refers to the spatial arrangements of short segments of the protein.

Correct statements related to the secondary structure of proteins are:

C. The β-folded sheet joined by hydrogen bonds between adjacent segments.

Protein structure includes primary structure, secondary structure, tertiary structure, and quaternary structure. Every protein, especially polypeptide, is a polymer which is a sequence formed from various L-α-amino acids (this sequence is also referred to as a residue). The three-dimensional structure of proteins is very necessary to understand the function of proteins at the molecular level.

Proteins are classified based on their physical size as nanoparticles. A protein can undergo reversible structural changes in carrying out its biological functions. Alternative structures of the same protein are called conformations.

Primary Protein Structure

This structure refers to the linear amino acid sequence of the polypeptide chain. This structure occurs because of the bond between the peptide and the convalescent, which occurs when the process of protein biosynthesis or commonly referred to as the translation process.

Secondary Protein Structure

This structure refers to regular sub-structure. The two main types of secondary structures are alpha helices and beta sheets. The secondary structure is determined by the hydrogen-bonding pattern between the main chain peptide groups.

Tertiary Protein Structure

Tertiary structure refers to the three-dimensional structure of a single protein molecule. Alpha helices and beta sheets are turned into spheres. The fold is controlled by hydrophobic interactions, but the structure can be stabilized only if the parts of the protein are locked into place by specific tertiary interactions.

Quaternary Protein Structure

This structure is a three-dimensional structure of several protein subunits that are bound together. In this context, quarterly structures are stabilized by the same non-covalent interactions and disulfide bonds as tertiary structures.

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Protein

Protein structure

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Class: College

Subject: Biology

Keyword: Secondary Protein Structure

digestion

it excretes wastes