BSC-2010 Midterm: Exam 3 Studyguide
Document Summary
Crick introduced an elegant-double helical model for the structure of dna. Morgan shows that genes are located on chromosomes chromosomes are the material inherited from one generation to the next. Helicase: breaks hydrogen bonds, separates (unwinds) dna strands. Primase: adds a short rna primer to ssdna (basis for elongation) Topoisomerase: nicks and unwinds dna ahead of the replication fork. Chapter 5: the structure and function of large. Uracil (c,t,u: have a single six-membered ring. Purines: adenine and guanine: have a six-membered ring to a five membered ring. Protein sequence: gly pro thr gly thr. Directs synthesis of messenger rna (mrna), and through mrna, controls protein synthesis. Cct acg ggc act part of a gene. Double stranded (ds) ds dna: forming a double helix, the two backbones run in opposite 5" 3" directions from each other, an arrangement referred to as antiparallel. A phosphate group is attached to the sugar molecule in place of the oh group on the 5" carbon.
