Question

A certain mutant DNA polymerase is error-prone, tending to incor-porate C opposite a template A. When such a DNA polymerase repli-cates a segment of DNA containing an A · T base pair, what will be the DNA composition in the daughter cells after (a) one and (b) two rounds of cell division? Assume that DNA repair does not occur. (5pts)

Answer 1

Answer:-  DNA templating is the process in which the nucleotide sequence of a DNA strand (or selected portions of a DNA strand) is copied by complementary base-pairing (A with T, and G with C) into a complementary DNA sequence (Figure below). This process entails the recognition of each nucleotide in the DNA template strand by a free (unpolymerized) complementary nucleotide, and it requires that the two strands of the DNA helix be separated. This separation allows the hydrogen-bond donor and acceptor groups on each DNA base to become exposed for base-pairing with the appropriate incoming free nucleotide, aligning it for its enzyme-catalyzed polymerization into a new DNA chain.

template S strand Food 23 3 . . . S strand 0 . 05 50 . . . new S strand 0 0 0 0 3 new S strand 5' • 3 0005 S strand parent DNA double helix 3 0 0 0 0 5 0 0 0 template S' strand

The DNA double helix acts as a template for its own duplication

The nucleotide A will successfully pair only with T, and G only with C, each strand of DNA can serve as a template to specify the sequence of nucleotides in its complementary strand by DNA base-pairing. In this way, a double-helical DNA molecule can be copied precisely.

Cell division occurs for many reasons, for example as the some of tissues die the new tissues gets generated and this is cell division.In our body there are 37 trillion cells. Cells regulate their division by communicating with each other using chemical signals from special proteins called cyclins. These signals act like switches to tell cells when to start dividing and later when to stop dividing. This is important too that cells should stop dividing at proper time because if continues to divide it may get converted into cancerous cells. Because cancer is uncontrolled proliferation of cells.

Meiosis, unlike mitosis, involves a single round of DNA replication followed by two rounds of cell division.