Exam 4 Review & Notes

B the ability of the trypanosomes to switch its

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Unformatted text preview: protein molecule. d) A carbohydrate molecule. e) A lipid molecule. 26. Transcrip8on results in: a) A DNA molecule. b) An RNA molecule. c) A protein molecule. d) A carbohydrate molecule. e) A lipid molecule. You just have to know the defini8on of transcrip8on for this one: Transcrip8on is the first step of gene expression, in which a par8cular segment of DNA is copied into RNA by the enzyme, RNA polymerase. See page 131 of the complete lecture notes for detailed process… 27. The codons for glutamine are CAG and CAA . The tRNA for glutamine in the cell has the an8codon: a) GUU and GUC b) UUG and CAG c) UUG d) CAG e) GUU 27. The codons for glutamine are CAG and CAA . The tRNA for glutamine in the cell has the an8codon: a) GUU and GUC b) UUG and CAG c) UUG d) CAG e) GUU “For example, the tryptophanyl tRNA has the an8codon 5'CCA which would pair with the codon 5'UGG (remember nucleic acids pair in an an8polar fashion) which is the codon that calls for tryptophan. This is the tRNATRP. Another example, the methionyl tRNA has the an8codon 5'CAU which pairs with the codon 5'ATG, the codon for methionine. This is the tRNAMET. The codon- an3codon pairing for many amino acids involves some unusual pairings involving U to G as well as A or I (inosine, a modified A) to A,U, or C. These occur only in the first posi3on of the anitcodon and mean that for many amino acids, one tRNA can pair with two different codons. For example, 5'UUU and 5'UUC are codons that call for phenylalanine. There is only a single tRNAPHE which has the codon 5'GAA that can pair with both codons.” - page 142 from the lecture notes See above about unusual pairing, the an8 codon needs to be flipped in order to match up with the codon. If the first posi8on of the an8 codon contains a U or A, it may be changed as to meet the criteria described above, given that the change will match it to the other codon for that amino acid....
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This document was uploaded on 02/26/2014 for the course ABIO 212 at SUNY Albany.

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