22. What is the difference
between the alpha-helix and
the beta-sheet protein
conformations?

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Alpha- and -sheet
conformations are the two main types of
secondary structure of a protein
. According to the primary
protein its secondary structure
can be of one type or the other.

In the alpha-helix structure the
polypeptide curls longi by the
of hydrogen bonds forming a
spiral, or helix. In the beta-sheet
the protein is more
distended and the hydrogen bonds form
a zig-zag-shaped protein structure
called -strand. Many assembled
beta make a beta-sheet.