AMY-2A Lecture Notes - Lecture 23: Fluid Mosaic Model, Guanine, Cytoskeleton
Document Summary
Nucleic acids (dna & rna)- a complex organic substance present in living cells, especially. Dna and rna, whose molecules consist of many nucleotides linked in a long chain. Nucleotide- basic unit forming dna and rna chains; it is made up of base, sugars, and phosphate group: base- nitrogen containing ring structure. Thymine (t) in dna or uracil (u) in rna. 64 possible combinations, 24 amino acids: sugar- pentose (ribose rna, deoxyribose dna) 5 use dehydration synthesis, phosphate group. Nucleotide attraction by hydrogen bonding of bases: a=t (a=u in rna, c=g. Genetic code- sequence of nucleotides dictates sequence in amino acids for a protein, carries genetic information in living cells. Gene- a sequence of nucleotides of dna molecule that codes for one protein. Atp adp + pi + energy (breaking bond releases useable energy) Plasma membrane- the surface encapsulating a cell, border of the cell, helps keep boundaries. Fluid mosaic model: bilayer of phospholipids.
