Be sure to answer all parts Consider tke following seguonce of DNA: 3-CCA ACC-5

Question

Be sure to answer all parts Consider tke following seguonce of DNA: 3-CCA ACC-5 ?. what dipeptide is formed from this DNA shr transcription and translation? b. Ifa mutation converts CCA to CCC in DNA, what dipeptide is formed e. Ifa mutation converts CCA to CAA in DNA, what dipeptide is formed? d. If a mutation converts CCA to CCC in DNA, what dipeptide is formed? d. TABLE 22.3 The Genetic Code-Triplets in Messenger RNA Second Base ULIC PheUCC SerUACTTBGCCys UUA LeuUCA Ser UAAStopUGAStop ULUG Leu UCG SerUAG StopGG His COC AS AUT ACU Thr AAU AAGUSer

Explanation / Answer

a) Transcription is a process of converting DNA to m-RNA. mRNA is always synthesized in the direction of 5' to 3'. 3' to 5' strand of DNA is called as template strand during transcription and the 5' to3' strand is the coding strand.Upon transcription Base A is replaced by U;T by A;G by C; and C by G.

dna 3'- CGA ACG-5'

After transcription

mrna 5' - GCU UGC -3'

Translation is a process of converting m-RNA to proteins using three letter genetic code and it also takes place in the direction of 5' to 3' end.

Now after translation dipeptide will be ALA-CYS (GCU code coresponds to alanine and UGC TO cystiene)

b) When CGA is replaced by CGC

DNA 3' CGC-ACG 5'

mRNA 5' GCG-UGC 3'

Dipeptide Ala-Cys(GCG corresponds to alanine)

c) When CGA is replaced by CAA.

DNA 3' CAA- ACG 5'

mRNA 5' GUU-UGC 3'

Dipeptide VAL- CYS(GUU corresponds to valine)

d) When CGA is replaced by CGG

DNA 3' CGG- ACG 5'

mRNA 5' GCC-UGC 3'

Dipeptide Ala- cys (GCC corresponds to ALA)

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