BI 253 Ch 4&5 WTF

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medic11
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172761
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BI 253 Ch 4&5 WTF
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2012-09-23 12:31:50
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BI 253
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Ch4&5 9-23-12
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  1. What is a glycosidic linkage?
    Covalent bond formed by condensation reactions joining monosaccharides
  2. What are the 4 main types of glycosidic linkages?
    • α-1.4
    • α-1,2
    • α-1,6
    • β-1,4
  3. What are 2 most common disaccharides w/their linkage types?
    • Sucrose α-1,2
    • Lactose β-1,4
  4. Humans can break down maltose but not cellobiose b/c. . . .
    Shape differences causing changes in biological nature
  5. What are oligosaccharides?
    Chain of 3-20 monosaccharides
  6. What are polysaccharides?
    Giant chains of monosaccharides connected by glycosidic linkages
  7. Polysaccharides are primarily used for ___ & ___ in the body.
    Storage & structural support
  8. Starch & glycogen are made up of what?
    Repeating monomers of glucose
  9. Galactosamine is a major component of ___.
    Cartilage
  10. Glucosamine is a component of ___ & found where?
    Chitin in skeletons of insects, prawns, crabs & cell walls of fungi
  11. What makes lipids hydrophobic?
    Non polar covalent bonds between hydrogen & carbon
  12. What causes lipids to want to stick to each other?
    Van der Waals forces
  13. Lipids in cell membrane structure are known as ____.
    Phospholipids
  14. Carotinoids are lipids that do what?
    Capture light energy in the eyes
  15. The polymer triglyceride is composed of what?
    4 monomers - 3 fatty acids & 1 glycerol molecule
  16. What bonds are used to link lipid molecules together?
    Ester Linkages formed by condensation reactions
  17. What comprises a fatty acid?
    Long chain of hydrocarbons w/carboxyl grp at one end
  18. When speaking of a saturated fat; what does saturated mean?
    It means the hydrocarbon chain in saturated w/hydrogen
  19. T or F. . Animal fats & tropical plant oils are saturated?
    True
  20. What tells us that a fatty acid is unsaturated?
    • At least 1 double bonded carbon causing bends in the chain
    • Liquid at rm temp
  21. How are hydrogenated oils created?
    By adding hydrogen to unsaturated fats.
  22. What is the structure of a phospholipid?
    • 2 hydrophobic fatty acid tails
    • 1 hydrophilic phosphate attached to the glycerol
  23. In an aqueous environment, how are phospholipids oriented & what do they form?
    • Phosphate heads face outward & fatty acid tails inward (tail to tail)
    • Cell membranes
  24. What is β-carotene used for in plants? In animals?
    • Trap light in photosynthesis
    • 2 identical pieces of vitamin A required for vision
  25. What is the mother structure for steroid hormones?
    cholesterol
  26. What vitamins are fat soluble?
    A,D,E & K
  27. Define Nucleic Acids.
    Polymers specialized for storage, transmission & use of genetic info
  28. What is the monomer of a nucleic acid?
    Nucleotide
  29. What are the 3 components of nucleotide?
    • Pentose Sugar
    • Phosphate grp
    • Nitrogen containing base
  30. What are the 2 sugars that could be in a nucleotide?
    • Ribose
    • Deoxyribose
  31. What is the difference between ribose & deoxyribose?
    An O molecule at Carbon #2
  32. Waxes protect against ___ in ___, ___ & ___ ___.
    • dehydration
    • Hair, feathers, insect eggs
  33. What is vitamin A mad fr & used for?
    • β-carotene
    • Norm development, Maintenance of cells & night vision
  34. Vitamin D is made in the ___ fr exposure to ____.
    • Skin
    • UV light
  35. Vitamin D does what?
    Aids absorption of Ca & important for bone health
  36. Vitamin E is a good ___.
    Antioxidant
  37. Vitamin K is important for ___ ___.
    Blood Clotting
  38. Nitrogenous bases can be either ___ or ___ in structure.
    • Pyrimidine - single ring structure
    • Purine - fused double ring structure
  39. Covalent bonds between nucleotides are called ___ ___.
    Phosphodiester Linkages
  40. Describe the phosphodiester linkage.
    Phosphate grp bonds to #3 C of 1 pentose & #5 C of another
  41. RNA molecules consist of what?
    • Single strand of nucleotides
    • Unpaired bases
  42. DNA is a ___ ___ of nucleotides.
    Double strand
  43. The double stranded DNA is antiparallel which means?
    One strand ends w/free C 5' of deoxyribose & other ends w/ C 3' of deoxyribose
  44. What are the 4 bases found in DNA?
    • Adenine (A) purine
    • Guanine (G) purine
    • Thymine (T) pyrimidines
    • Cytosine (C) pyrimidines
  45. What are the 4 main types of Biomolecules (macromolecules)?
    • Proteins
    • Carbohydrates
    • Lipids
    • Nucleic Acids
  46. What are some roles of lipids (2)?
    • Energy Storage
    • Structural support
  47. What are some roles of proteins (8)?
    • Structural support (collagen)
    • Catalysis (enzymes)
    • Transport (hemoglobin)
    • Protection & defense (Antibodies/keritin)
    • Regulation of metabolic activities
    • Maintenance of Homeostasis
    • Info Storage
    • Means for mvmt, growth & development
  48. What are 2 roles of carbohydrates?
    • Energy Storage (glycogen)
    • Mvmt, growth & development
  49. What are polymers?
    Long chains of monomers linked together by covalent bonds
  50. ___, ___ & ___ are considered lg molecules.
    Proteins, Polysaccharides & Nucleic acids
  51. What 6 elements compose monomers?
    C, H, O, N, P, S
  52. ___ & ___ make up skeletons & then special grps of atoms attach in specific places.
    Carbons & Hydrogens
  53. What are functional groups?
    Special grps of atoms w/specific chem properties that attach to a larger molecule
  54. An isomer is what?
    • Molecule w/same chem formula but atoms arranged differently
    • ie glucose & fructose
  55. Explain structural Isomers.
    Isomers that differ in how their atoms are joined together or bonding arrangement
  56. Explain geometric Isomers.
    Isomers that differ in the placement of their functional grps or atoms around a double bond
  57. Each functional grp has a ___ ___ ___ which it confers to the larger molecule.
    Specific Chem Property
  58. Optical or stereoisomers occur when . . . .
    An α-carbon has 4 different functional grps attached to it & 2 resulting molecules are mirror images of each other.
  59. What does a condensation or dehydration reaction do?
    Builds polymers fr monomers by covalently bonding OH grp of 1 to a H of another w/release of a molecule of H₂O
  60. What 2 things are required for a condensation reaction?
    Energy & special enzymes
  61. What does a hydrolysis reaction accomplish?
    Breaks covalently bonded polymers into monomers w/the addition of H₂O
  62. What are 3 characteristics of hydrolysis reactions?
    • H₂O reacts w/covalent bonds linking polymers together
    • Energy is released
    • Performed by enzymes
  63. What is the monomer or building block in a protein?
    Amino Acids
  64. Explain a peptide bond?
    Covalent bond between amino acids formed by a condensation reaction between a carboxyl grp & amino grp of another resulting in a polypeptide.
  65. What is a polypeptide?
    Single chain of amino acids held together by peptide bonds
  66. What are the 3 parts of an amino acid structure?
    • Amino Grp - N containing portion
    • Acid - Carboxyl Grp
    • R-Grp - Functional grp attached to α-carbon
  67. Explain the R-Group.
    • Functional Group attached to α-carbon
    • Makes 1 type of amino acid different fr another
  68. Explain a Zwitterion.
    • At pH of 7, both amino & carboxyl group are ionized
    • Carboxyl grp lost an H ion & amino grp has gained 1
  69. Explain why we have D-amino acids & L-amino acids.
    B/c α-carbon has 4 different functional grps attached to it we can get 2 isomeric forms that are mirror images. One is D-form & other is L-form.
  70. What is the exception to the α-carbon rule & why?
    Glycine b/c it has a H in its R group
  71. If we shine light at a D-amino acid what happens & what does D stand for?
    • Light will rotate clockwise
    • D means dexterrotatory
  72. If we shine light at an L amino acid what happens & what does L stand for?
    • Light will rotate counterclockwise
    • L stands for levorotatory
  73. Only ___ ___ are commonly found in the proteins of most organisms.
    L-amino acids
  74. What are the 3 primary classifications of amino acids?
    • Charged R-Grps
    • Polar w/o a charge
    • Non-polar hydrophobic
  75. What are the 3 special cases of amino acids?
    • Cysteine
    • Glycine
    • Proline
  76. The 1st amino acid of a peptide is called the what?
    • N-terminus amino acid
    • Free amino grp
  77. The last amino acid of a peptide is called the ___ ___ ___.
    • C-terminus amino acid
    • Free carboxyl grp
  78. What are the 4 levels of protein structure?
    • Primary
    • Secondary
    • Tertiary
    • Quaternary
  79. The primary structure of a protein is its ___ ___ ___.
    Amino acid sequence
  80. The secondary structure of a protein requires ___ ___.
    hydrogen bonding
  81. What are the 2 common secondary structures?
    • α helix - single poly peptide chain
    • β pleated sheet - single or multiple polypeptide chains
  82. Explain α helix structure.
    Right handed coil w/spiral shape being caused by H bonds between slightly pos H & slightly neg O
  83. What could prevent the creation of the α helix structure?
    Large R groups
  84. Explain a β sheet.
    Sheet like structure stabilized by H bonds between regions of a peptide
  85. Explain Parallel β sheets.
    • Sheets where strings of peptides are aligned all the same way.
    • Carboxyl grps on 1 end & amino grps on the other
  86. Explain Antiparallel β sheets.
    • Sheets where strings of peptides are aligned in an alternating pattern.
    • 1st string starts w/carboxyl grp then 2nd starts w/amino & so forth
  87. How is the tertiary structure of a protein formed & what determines its shape?
    • By bending & folding secondary structures
    • Determined by interaction between R groups
  88. How can R groups interact in tertiary structures?
    • Form disulfide bridges
    • Hydrogen bonding
    • Van der Waals forces
    • Salt bridges
    • Hydrophobic Interactions
  89. What are salt bridges?
    Ionic interactions between pos & neg charges deep in protein
  90. What is a quaternary structure?
    • Subunits of tertiary structures coming together to form final protein.
    • ie hemoglobin
  91. What are chaperonins?
    Specialized proteins that keep other proteins fr interacting inappropriately w/one another prior to positioning
  92. When proteins misfold what could happen?
    They don't interact properly w/the environment & build up. The body tries to get rid of them & creates more problems in so doing
  93. What are some reasons for protein specificity (5)?
    • Cells can attach together by protruding proteins
    • Enzymes need certain shapes to bind correctly
    • Carrier proteins allow substances to enter cell
    • Chem signals (ie hormones) bind to proteins on cell surface
    • Antibodies recognize virus shape & bind to it
  94. What is denaturation?
    • Loss of protein's normal 3-D structure
    • Only primary structure remains intact
    • Can be reversible or irreversibl
    • ie cooking an egg
  95. What can cause denaturation?
    • Changes in temp or pH
    • High concentrations of polar substances
  96. T or F: Some proteins can resist denaturation & be boiled for days bt once they cool they retain their reg activity
    True
  97. What's are 2 proteins that resist denaturation/
    • RNase
    • Prions
  98. What is the issue w/proteins that resist denaturation?
    • They remain present even when we think they have been eliminated.
    • ie on surgical instruments
  99. What does a carbohydrate contain?
    Carbon molecules w/hydrogen & hydroxyl groups
  100. How do carbs act as energy storage molecules in plants? In animals?
    • Plants produce & store as sugar & starches
    • Animals store as glycogen
  101. What are the 4 major categories of carbohydrates?
    • Monosaccharides
    • Disaccharides
    • Oligosaccharides
    • Polysaccharides
  102. What is the general formula for a carb monomer & in what ratio?
    • CH₂O
    • Always 1:2:1
  103. What is the most common monosaccharide & its formula?
    • Glucose
    • C₆H₁₂O₆
  104. When bonding monosaccharides what must we remember?
    • H₂O is released therefore it comes out of the disaccharide
    • C₆H₁₂O₆ + C₆H₁₂O₆ --> C₁₂H₂₂O₁₁ + H₂O
  105. Like proteins, monosaccharides are also stereoisomers. Which series (d or L) are most common?
    d-series
  106. Isomers of glucose are known as ___ & come in what forms?
    • Anomers
    • β-glucose or α-glucose
  107. What distinguishes α-glucose fr β-glucose?
    α-glucose has H on top @ C#1; β it is on bottom
  108. A hexose is a ___ ___ sugar.
    6 carbon
  109. A 5 carbon sugar is called ___ & found in ____.
    • Pentose
    • DNA/RNA

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