BIOL 302 1st Edition Lecture 3Outline of Previous Lecture I. Stem CellsII. Cell CycleOutline of Current LectureI. Macromoleculesa. H2Ob. Proteins Current LectureI. Macromoleculesa. H2Oi. Hydrophilicity (water-loving) vs. hydrophobicity (water-fearing)1. Hydrophilicity: dissolves in water, mostly polar2. Hydrophobicity: fatty acids, non-polar. a. Fatty acids that are in micelle – orientates w/ themselves into a center that will exclude waterb. Bilayer – the tails are connected mostly where it excludes waterii. Polar molecules – unequal distribution of molecules (electrons)iii. The hydrogen bonding is between the oxygen and another hydrogen fromthe other water molecule due to the negative and positive interactioniv. Water is great for transferring heat and electricity efficientlyv. Surface tension b/w the molecules to hold together and can see insects with rigid structuresb. Proteinsi. Very complex and can absorb and reflect lightii. Average size: ~300 aa (amino acids)1. Small hormone (vasopressin and oxytocin): 9 aa2. Myosin (muscle contraction): ~2000 aa3. Titin: ~2700 aaiii. Acidic & BasicityThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.1. Amino acids change their properties as a function of pH. The lower the pH the more of a chance to accept a proton. When it loses it’s charge it becomes high in concentration and acidity2. Both are charged at pH 7. Acid: donates a proton, Base: accepts a proton. iv. The type of protein, whether it is non-polar or polar, all depends on the R group that is attached to the amino acid.v. Central amino acid are amino acids that our body can’t produce and is rather
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