Question

1. the tertiary structure of proteins forms due to:

(1 point) *

a) amino acid sequence only
b) bonding between r - groups
c) peptide linkages only
d) water molecules alone

Explanation:

The tertiary structure of proteins is the three - dimensional folding of a single polypeptide chain. It is stabilized by interactions between the R - groups (side chains) of amino acids. These interactions include hydrogen bonds, disulfide bridges, ionic bonds, and hydrophobic interactions.

• Option a: The amino acid sequence (primary structure) is just the starting point. By itself, it does not form the tertiary structure.
• Option c: Peptide linkages are responsible for the primary structure (the linear chain of amino acids) and not the tertiary structure.
• Option d: Water molecules can be involved in some of the interactions (e.g., hydrophobic interactions where non - polar R - groups cluster away from water), but it is not the sole factor. And the main factor is the bonding between R - groups.

Answer:

B. Bonding between R - groups