23.A small section of a Saccharomyces cerevisiae protein has the amino acid sequence valine, histidine, cysteine, and lysine.
A mutation in the gene sequence that codes for the above amino acid sequence resulted in the substitution of amino acid cysteine with amino acid tyrosine.
The mutation in the antisense strand DNA of Saccharomyces cerevisiae gene described above involves
Select one:
a. the substitution of cytosine base from ACA
b. the deletion of second uracil base from UGU
c. the deletion of second adenine base from ACA
d. the substitution of guanine base from UGU
Several genes code for enzymes that are responsible for histidine biosynthesis in Escherichia coli. Part of the amino acid sequence for one of these enzymes is:
AUG CCU UGG GCC CAA AAA UGC
24. A series of mutants that have lost activity for this enzyme are recovered. The mutant products are analyzed and found to have the following amino acid sequences:
Mutant 1: Met-Pro-Trp-Pro-Glu-Lys-Cys
Mutant 2: Met-Pro
Mutant 3: Met-Pro-Cys-Gly-Pro-Lys-Met
Mutant 4: Met-Pro-Trp-Pro-Lys-Asp
Choose the correct type of mutation that occurred in the DNA to produce each mutant type.
Nonsense Answer
Point Answer
Addition Answer
Deletion Answer
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