e) From thymine dimmers 21. a) b) c) d) e) Ultraviolet light causes mutation by:

Question

e) From thymine dimmers 21. a) b) c) d) e) Ultraviolet light causes mutation by: Inserts between paired bases Competes with nature bases Removes amino groups from bases Cause strand break From thymine dimmens 22. Frame shift mutations causes: a) Alternation of reading frame of entire protein from the point of mutation b) Change of codon to a stop-codon c) Change of a codon that will cause incorporation of same amino acicd d) Addition of one or more base e) Deletion of one or more base Nonsense mutation causes: Alteration of reading frame of entire protein from the point of mutation Change of codon to a stop-codon Change of a codon that will cause incorporation of same amino acid Addition of one or more base Deletion of one or more base 23. a) b) c) d) e) 24. a) b) c) d) A point of mutation may also be named as: Addition mutation Deletion mutation Substitution mutation All of the above are true a) b) c) d) e) Transformation is a process of large-scale introduction of the following types of D Naked DNA DNA in virus Plasmid DNA in another bacterial cells Rearrangement DNA All of the above 26. Study the nucleotide sequences of wild type and its mutant gene below. Wild type: GAACCATG Mutant: GAACAATG This mutation can best be called: a) Pont b) Substitution c) Transversion d) All of the above

Explanation / Answer

21. E) form thymine dimers

Ultraviolet light would be able to cause TT base pairs beside one another, which would be left to bind to the pyrimidine dimers. This results in strand disruptions such that the strands would not be copied by the enzymes used for repeorduction. The CC Wwould b mutated to TT. UV light does not cause any specific inserts, but, causes mutations in Cytosine. There will not be removal of any amino group. The strand is disrupted because of the formation of thymine dimers and because these could not be replicated by the enzymes.

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