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Lecture 3

BIOL 1201 Lecture Notes - Lecture 3: Thalidomide, Enantiomer, Protein StructurePremium


Department
Biological Sciences
Course Code
BIOL 1201
Professor
Moroney, James
Lecture
3

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Biol1201Lecture3Water,PH,Carbon
ClickerQuestions(studyquestion)
● Oxygenhasanatomicweightof16andanatomicnumberof8.Howmanyprotonsdoes
Oxygenhave?8
● Oxygenhasanatomicweightof16andanatomicnumberof8.Howmanyneutrons
doesOxygenhave?8
● Oxygenhasanatomicweightof16andanatomicnumberof8.Howmanyelectrons
doesOxygenhave?8
Oxygen has an atomic weight of 16 and an atomic number of 8. How many bonds does
Oxygennormallyforminbiologicalmolecules?2
● Oxygenformswhattypeofbondsinbiologicalmolecules?PolarCovalentbonds
QuizSept16.ismultiplechoiceandhas25questions.
Water
● Alittlebitofionbehavior.
● Rareinpurewater,dissociationoccursonlyonceinevery554millionH
2
Omolecules
● InpureH
2
O,concentrationofH
+
=OH
;concentrationofeachisonly1X10
7
M
● H
+
andOH
areveryreactiveandthusimportanttobiologicalsystems
● H
+
andOH
balancecanbeupsetbyacids(increaseH
+
)andbases(increaseOH
)
pH
● pHisdefinedasthenegativeofthelogofthehydrogenionconcentration
● pH=log[H
+
]
● Example:pH=6
● [H
+
]=1X10
6
=0.000001M
● Fig.3.10inbook
● Buffers:contributeandacceptH
+
,maintainstablepH
o Carbonicacidbiologicalbuffer
o AbsorbsextraOH
● ImportanceofpHregulation:
● Metabolicreactions
● Molecularstructure
● Toxicityofmolecules
Carbon
● Carbonhasavalenceoffour
● Carbonformsfourcovalentbonds
● Bondanglesformatetrahedron
● Acarbonatomcanformasingleordoublebondwithanotheratom
● Isomer:commonmolecularformulae,differentstructuresandproperties
● 1.Structural–variationincovalentpartners
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