DNA. Nucleic Acids zRoles in the storage, transmission and expression of genetic material zDNA - deoxyribose + a phosphate group + a nitrogen containing.

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Presentation transcript:

DNA

Nucleic Acids zRoles in the storage, transmission and expression of genetic material zDNA - deoxyribose + a phosphate group + a nitrogen containing base (purine and pyridamine) zRNA - ribose + a phosphate group + a nitrogen containing base (purine and pyridamine)

DNA - deoxyribose + a phosphate group + a nitrogen containing base (purine and pyridamine) zPyridamines - cytosine (c) and thymine (t) zpurines - guanine (g) and adenosine (a) zA=T zC=G

Replication zSynaptic phase of interphase zDNA “unzips” zeach side acts as a template to complete a new strand of DNA zeach replicated stand consists of one new strand and one old strand - semiconservative replication

Replication z…is never 100% accurate zalways some variation zHow does error occur? zErrors in somatic cells zErrors in gametes

RNA zWhile DNA contains the genetic message it does not actually contain the information to cause the message to be expressed zRNA is the messenger zRNA synthesis similar to DNA

Transcription zDNA “unzips” zRNA is synthesized using the DNA as a template except that thymine is replaced by uracil (A=U) zRNA detaches (single strand) zDNA reconnects as transcription is completed

3 types of RNA zMessenger RNA (RNAm) carries coded instructions for protein synthesis zTransfer RNA (RNAt) carries specific amino acids to ribosomes during protein assembly zRibosomal RNA (RNAr) part of ribosomes