Answer:
The correct answer is "B" ACh
Explanation:
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Lets calculate the parameters of the problem. Suppose that the width is x feet. THen, the length is x+30 feet. The area of this parallelogram is given by the product of length and width, hence x(x+30). This has to be equal to 600.
Hence, x is the solution to the equation x(x+30)=600.
x*x+30x=600 hence x*x+30x-600=0. This is a second degree equation and we can calculate Δ=b*b-4ac=3300. The general solution is given by:

.
Substituting, we get that x=-30/4+

or x=-7.5+25*

. This is the width; the length is given by x+30.
The third codon (three bases) in the sequence was mutated from GAT to AAT. The GAT codon translates to the amino acid aspartic acid. The AAT codon translates to the amino acid asparagine. This is what's called a point mutation, specifically a missense mutation since the translated amino acid is changed. Deletion and inversion mutations are not the answer because these mutations involve the chromosomes as a whole, not just bases. Frame shift mutations occur when 1 or 2 (but not 3) bases are added or deleted from the sequence causing an array of point mutations (domino effect).