CHARACTERISTICS OF CHEMICAL BONDS, 51
Chemical Bonds Are Explainable in Quantum-
Mechanical Terms, 52
Chemical-Bond Formation Involves a Change in the
Form of Energy, 53
Equilibrium between Bond Making and Breaking, 53
THE CONCEPT OF FREE ENERGY, 54
Keq Is Exponentially Related to DG, 54
Covalent Bonds Are Very Strong, 54
WEAK BONDS IN BIOLOGICAL SYSTEMS, 55
Weak Bonds Have Energies between 1 and
7 kcal/mol, 55
Weak Bonds Are Constantly Made and Broken at
Physiological Temperatures, 55
The Distinction between Polar and Nonpolar
Molecules, 55
van der Waals Forces, 56
Hydrogen Bonds, 57
Some Ionic Bonds Are Hydrogen Bonds, 58
Weak Interactions Demand Complementary
Molecular Surfaces, 58
Water Molecules Form Hydrogen Bonds, 59
Weak Bonds between Molecules in Aqueous
Solutions, 59
Organic Molecules That Tend to Form Hydrogen
Bonds Are Water Soluble, 60
Hydrophobic “Bonds” Stabilize Macromolecules, 60
ADVANCED CONCEPTS BOX 3-1 The Uniqueness of
Molecular Shapes and the Concept of Selective
Stickiness, 61
The Advantage of DG between 2 and 5 kcal/mol, 62
Weak Bonds Attach Enzymes to Substrates, 62
Weak Bonds Mediate Most Protein–DNA and
Protein–Protein Interactions, 62
HIGH-ENERGY BONDS, 63
MOLECULES THAT DONATE ENERGY ARE
THERMODYNAMICALLY UNSTABLE, 63
ENZYMES LOWER ACTIVATION ENERGIES IN
BIOCHEMICAL REACTIONS, 65
FREE ENERGY IN BIOMOLECULES, 66
High-Energy Bonds Hydrolyze with Large
Negative DG, 66
HIGH-ENERGY BONDS IN BIOSYNTHETIC
REACTIONS, 67
Peptide Bonds Hydrolyze Spontaneously, 68
Coupling of Negative with Positive DG, 69
ACTIVATION OF PRECURSORS IN GROUP
TRANSFER REACTIONS, 69
ATP Versatility in Group Transfer, 70
Activation of Amino Acids by Attachment of AMP, 70
Nucleic Acid Precursors Are Activated by the
Presence of P P , 71
The Value of P P Release in Nucleic Acid
Synthesis, 72
P P Splits Characterize Most Biosynthetic
Reactions, 73
SUMMARY, 74
BIBLIOGRAPHY, 75
QUESTIONS,
Molecular Biology of the Gene Seventh Edition PDF Ebook
