Lecture_3 - BCHS 3304 General Biochemistry I Section 07553 Spring 2003 1:00-2:30 PM Mon/Wed AH 101 1 http/www.uh.edu/sibs/faculty/glegge Instructor

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BCHS 3304: General Biochemistry I, Section 07553 Spring 2003 1:00-2:30 PM Mon./Wed. AH 101 http://www.uh.edu/sibs/faculty/glegge Instructor: Glen B. Legge, Ph.D., Cambridge UK Phone: 713-743-8380 Fax: 713-743-2636 E-mail: glegge@uh.edu Office hours: Mon. and Wed. (2:30-4:00 PM) or by appointment 353 SR2 (Science and Research Building 2) 1
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SIBS program Monday Chat room on Webct: 8:00-10:00 PM Tuesday Workshop: 5:00-7:00 PM in 101 AH Wednesday Office Hours: 3:00-4:45 PM in 114 S Wednesday Workshop: 5:00-7:00 PM in 116 SR1 Students must activate their webct accounts. SIBS will not print out exam reviews Jerry Johnson (BCHS 3304 workshops) contact email: MYSTIK1775@aol.com
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Molecules and Water January 22 2003
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Molecules in life processes C, H, O, N, P, and S all readily form covalent bonds. Only 35 naturally occurring elements are found in life processes . Earth’s Crust 47% O2, 28% Si, 7.9% Al, 4.5% Fe, and 3.5% Ca. B, C, N, Si and P can form three or more bonds and can link together.
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Carbon Carbon forms the basis of life Carbon has a tremendous chemical diversity can make 4 covalent bonds can link together in C-C bonds in all sorts of flavors Readily forms stable hetronuclear bonds
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Boron Symbol: B Atomic number: 5 Atomic weight: 10.811 (7) g m r Boron has only three valence electrons-this limits the stability and types of compounds it can make.
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Nitrogen Symbol: N Atomic number: 7 Atomic weight: 14.0067 (2) g r Nitrogen has five valence electrons repulsion between the lone pair and the other orbital electrons make the N-N bond less stable (171 kJ/mole) than the C-C bond (348 kJ/mole). However, N triple bond is so stable 946 kJ/mole it can not break easily.
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Silicon and Phosphate Silicon has a large radius preventing good orbital overlap thus Si-Si bonds are relatively weaker at 177 kJ/mole This makes longer Si-Si chains are unstable Si-O bonds are very stable 369 kJ/mole Si cannot have higher oxidation states other than SiO 2 which is sand Poly phosphates are even less stable
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Carbon heteronuclear bonds Heteronuclear are stable and form in living matter These bonds are less stable than C-C bonds Often C-O-C and C-N bonds are places where cleavage sites are found.
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Self Replicating RNA molecules “RNA World” Catalytic RNA. Chemical Evolution
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This note was uploaded on 02/22/2011 for the course BCHS 3304 taught by Professor Johnson during the Spring '08 term at University of Houston.

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Lecture_3 - BCHS 3304 General Biochemistry I Section 07553 Spring 2003 1:00-2:30 PM Mon/Wed AH 101 1 http/www.uh.edu/sibs/faculty/glegge Instructor

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