BIOLOGY 2B03 Study Guide - Midterm Guide: Deoxyribose, Choline, Thymine
12 Dec 2012
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Looked at thin slices of cork: compartments of cork were called cellulae (little room) Cell theory: all organisms consist of 1 or more cells, cell is the basic unit of structure, all cells arise from pre-existing cells (basic unit of reproduction) 1 micrometer= 1000 nm . 001 micrometers= 1 nm. Surface area to volume ratio is why cells are small. We want a small object (large sa:vol) Less distance to transport to middle of cell. 6 elements: c h o n p s. Certain combos are most prevalent: h2o (70%) Polar- allows it to hydrogen bond (with itself) (h is shared between 2 e-) oho. Other charged molecules can bind (proteins, carbs) Silicon is almost as good as carbon (has 3 bonds instead of 4) Carbon has no size limit (long chains) Other common combos: ch3, oh, cooh, nh2. Most in 4 families: simple sugars, fatty acids, amino acids, nucleotides. Most common is n-acetyl glucosamine (found in chitin)
