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Transcript of Biology: Life on Earth Eighth Edition Biology: Life on Earth Eighth Edition Chapter 3 Biological...
Biology: Life on EarthEighth Edition
Biology: Life on EarthEighth Edition
Chapter 3Biological Molecules
Chapter 3Biological Molecules
Copyright © 2008 Pearson Prentice Hall, Inc.
Teresa Audesirk • Gerald Audesirk • Bruce E. ByersTeresa Audesirk • Gerald Audesirk • Bruce E. Byers
Figure 3-3 Biology: Life on Earth 8/e ©2008 Pearson Prentice Hall, Inc.
hydrogen bond
hydroxylgroup
water
glucose
Figure 3-7 Biology: Life on Earth 8/e ©2008 Pearson Prentice Hall, Inc.
glucose sucrosefructose
Dehydrationsynthesis
Figure 3-9 Biology: Life on Earth 8/e ©2008 Pearson Prentice Hall, Inc.
cellulose fiber
wood is mostly cellulose plant cell with cell wall close-up of cell wall
hydrogen bondscross-linkingcellulose molecules
bundle ofcellulosemolecules
individualcellulosemolecules
Figure 3-9d Biology: Life on Earth 8/e ©2008 Pearson Prentice Hall, Inc.
cellulose fiber
hydrogen bondscross-linkingcellulose molecules
bundle ofcellulosemoleculesindividual
cellulosemolecules
Figure 3-11 Biology: Life on Earth 8/e ©2008 Pearson Prentice Hall, Inc.
glycerol
3 watermolecules
triglyceride
fatty acids
Figure 3-15 Biology: Life on Earth 8/e ©2008 Pearson Prentice Hall, Inc.
(hydrophilic)
fatty acid tailspolarhead
glycerolbackbone
(hydrophobic)
Figure 3-16 Biology: Life on Earth 8/e ©2008 Pearson Prentice Hall, Inc.
estrogen
testosteronecholesterol
Figure 3-18 Biology: Life on Earth 8/e ©2008 Pearson Prentice Hall, Inc.
aminogroup
carboxylicacid group
variablegroup
hydrogen
Figure 3-19a Biology: Life on Earth 8/e ©2008 Pearson Prentice Hall, Inc.
aspartic acid (asp)
hydrophilicfunctional groups
glutamic acid (glu)
Figure 3-19b Biology: Life on Earth 8/e ©2008 Pearson Prentice Hall, Inc.
phenylalanine (phe)
hydrophobicfunctional groups
leucine (leu)
Figure 3-19c Biology: Life on Earth 8/e ©2008 Pearson Prentice Hall, Inc.
sulfur-containingfunctional group
(can form disulfide bridges)
cysteine (cys)
Figure 3-20 Biology: Life on Earth 8/e ©2008 Pearson Prentice Hall, Inc.
peptidebond
amino acid amino acid peptide water
aminogroup
aminogroup
carboxylicacid
group
Figure 3-21 Biology: Life on Earth 8/e ©2008 Pearson Prentice Hall, Inc.
(a) Primary structure: Thesequence of amino acids linkedby peptide bonds.
heme group
hydrogenbond
helix
(d) Quaternary structure:Individual polypeptides are linkedto one another by hydrogen bondsor disulfide bridges.
(c) Tertiary structure:Folding of the helix results from hydrogen bonds with surrounding water molecules and disulfide bridges between cysteine amino acids.
(b) Secondary structure:Usually maintained byhydrogen bonds, whichshape this helix.
Figure E3-4 Biology: Life on Earth 8/e ©2008 Pearson Prentice Hall, Inc.
protofibril
single hair
enlargementof single hair
microfibril
hydrogen bonds
helix ofsingle keratinmolecule
disulfide bridges
hair cell