BIO 101 Lecture Notes - Lecture 11: Frederick Griffith, Streptococcus Pneumoniae, Dna Replication

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Transforming principle something in s bacteria allows r bacteria to change into s bacteria: candidate = dna. Viruses infect cells grow more copies inside cell burst cell continue. Two backbones have to run in opposite directions. Chains have to run in opposite directions only possible if two ends of molecule are different. C = g - three h bonds between c and g: one end = 5" (cid:523)five prime(cid:524, other end = 3" (cid:523)three prime(cid:524) A = t two hydrogen bonds between a and t. All dna sequences are read 5" to 3": a and t always have same quantity, c and g always have same quantity. Replicating dna you can separate the two strands and make a new complimentary strand for each. Mutation = incorrect complimentary pairing that survives: most are harmful, occasionally (not very likely) a mutation can improve something.

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