
A.
To explain: The active site of an enzyme that usually occupies only a small fraction of the enzyme surface.
B.
To explain: Catalysis by some enzymes involves the formation of a covalent bond between an amino acid side chain and a substrate molecule.
C.
To explain: A β sheet can contain up to five strands, but not more.
D.
To explain: The specificity of an antibody molecule is contained exclusively in loops on the surface of the folded light-chain domain.
E.
To explain: The possible linear arrangements of amino acids are so vast that new proteins almost never evolve by alteration of old ones.
F.
To explain: Allosteric enzymes have two or more binding sites.
G.
To explain: Non-covalent bonds are too weak to influence the three-dimensional structure of macromolecules.
H.
To explain: Affinity chromatography separates molecules according to their intrinsic charge.
I.
To explain: Upon centrifugation of a cell homogenate, smaller organelles experience less friction and thereby sediment faster than larger ones.

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Chapter 4 Solutions
Essential Cell Biology (fifth Edition)
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