The φ angle represents rotation about which bonds? (mark these bonds with a φ directly on this structure) This image illustrates a structural formula of a pentapeptide, which is a type of peptide made up of five amino acids linked by peptide bonds. The sequence of the amino acids is from left to right:1. **Glutamic Acid**: - Side chain: CH₂-CH₂-COOH.2. **Valine**: - Side chain: CH-(CH₃)₂.3. **Serine**: - Side chain: CH₂-OH.4. **Lysine**: - Side chain: (CH₂)₄-NH₂. 5. **Cysteine**: - Side chain: CH₂-SH.### Peptide Bonds:The red circled areas in the diagram represent the peptide bonds, which are formed by the condensation reaction between the carboxyl group of one amino acid and the amine group of the next amino acid.### General Structure Description:- **Backbone**: Comprised of repeating units of nitrogen (N), carbon (C), and oxygen (O).- **R-groups**: Each amino acid has a specific side chain or R-group, which gives the amino acid its unique properties. These are branching from the main chain. This structure is a simplified representation of the arrangement and linkage of amino acids that form a functional element in various biological processes. Understanding these linkages can provide insight into protein biosynthesis and function.

ϕ and ψ are the dihedral angles. Specific dihedral angles are shown by different dihedral angles. If only dihedral angles of a peptide are given, one can easily tell that this peptide has which type of secondary structures. Both of these dihedral angles can rotate 360 degree. Dihedral angles ϕ and ψ are the rotational angles around N-Cα and Cα-C bonds respectively. ϕ angles are marked in the peptide are given below: ϕ is the rotational angle around N-Cα bond as marked in the pentapeptide image.