Biology Lecture 9

Biology Lecture 9 - BiologyLecture93 Dissociation:

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Biology Lecture 9-3 21:47 Dissociation:   Many molecues come apart dissociate when placed in water These molecules break into the constituent ions. NaCl---  Na+ and Cl- Acids, Bases, and Salts     Acids produce H+ ions HCL--- H+ and Cl- Bases produce hydrocide ions NaOH--  Na+ and OH- Salts produce nerither NaCl----Na+ and Cl- pH     A measure of the hydrogen ion concentration pH=-log [H+] If hydrogen ion concentration goes up, pH level goes down (more acidic if  goes down) Note: relationship with [OH-], the sum of the pH and pOH =14 **always equals  14 7 is neutral pH, when pH and pOH are equivalent pH smaller than 7 are acidic pH larger than 7 are considered basic.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Buffers     Substances that maintain a constant pH Organic molecules     Complex molecules containing a carbon-carbon bond(carbon backbone) Composed largely of C, H, O, N(s,p) There are 100’s of 1000’s of organic molecules Functional Groups Groups of atoms attached to the carbon backbone of organic molecules Cause changes in physical characteristics and chemical properties Hydroxyl o –OH o Polar group o Go into solution in water Carbonyl o Carbon with double-bond oxygen o Ketone located in a carbon chain o Aldehyde located on the end of a chain o Polar covalent bond between carbon and oxygen Carboxyl o HO-C=O o H+ -o-C=O Amino o H-N-H
Background image of page 2
o Polar functional group Phosphate o Phosphate groups are acidic functional groups Sulfhydryl o –SH o This group very close to being non-polar o Essentially non polar These above are polar except sulfhydryl Methyl o –CH Not a functional group but important o C-H o Pure covalent bonds Pol ar Non  pola r Hy dro xyl Sulf hydr yl Ca bo nyl Met hyl Classes of organic molecules     Carbohydrates, Lipids, Proteins, and Nucleic Acids Carbohydrates     Carbon, and water, a hydrate Compounds with a raton of:
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
1 carbon: 2 Hydrogens: 1 Oxygen o Types of Carbohydrates Monosaccharides: 1 sugar Disaccharides: 2 sugars Produced through condensation reactions Reverse: a hydrolysis reaction(to break these down) split water  molecule into hydroxyl Polysaccharides: many sugars Cellulose: Structural In cellulose, strength insnt in one chain, its that all these are  bundled together with hydrogen bonds which has a large  cumulative strength Starch: storage (plants) Glycogen: storage (animals) Lipids     o Lipids are insoluble in water o They are non polar molecules. Types of lipids
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 70

Biology Lecture 9 - BiologyLecture93 Dissociation:

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online