If you substituted the carbonyl in the peptide bond with a C-F bond, the strands would get closer together.
All of the amino acids could form a hydrogen bond with another amino acid in the chain to stabilize the secondary structure of a b-pleated sheet.
Protein is composed of amino acid linked with peptide bond.
Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as fluorine (F), oxygen (O) and nitrogen (N) atoms.
In a beta-pleated sheet, hydrogen bonds are formed between carbonyl and amino groups of backbone (see picture below).
Fluorine atom has greater electronegativity than oxygen atom in carbony group, so the hydrogen bond with hydrogen atom is shorter and strands are closer.
Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.
More about beta-sheet: brainly.com/question/5297569
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