13. An (E) coli mutation that greatly reduces the 3'-5' exonuclease activity of DNA polymerase I would result in: (A) cell death (B) very little or no effect on cell viability (C) a significantly decreased mutation rate (D) a significantly increased mutation rate

13. An
(E) coli mutation that greatly reduces the 3'-5' exonuclease activity of DNA polymerase I would result in:
(A) cell death
(B) very little or no effect on cell viability
(C) a significantly decreased mutation rate
(D) a significantly increased mutation rate

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10. In September 2016, a baby was born with the DNA of two women (the mother and a donor) and a man (the father). The baby was conceived through the technique of so called "three-parent in vitro fertilization". Which of the following statement is correct: (A) The three parents provided DNA from nucleus, peroxisome and mitochondrion, respectively. (B) The nucleus was removed from the egg cell of a donor and the de-nucleated egg cell was then injected with the nuclear DNA from the mother's egg cell. (C) The technique was used because the mother has a genetic disease due to a mutation in the nuclear DNA. (D) The sperm provided the mitochondrial DNA.

13. An
(E) coli mutation that greatly reduces the 3'-5' exonuclease activity of DNA polymerase I would result in:
(A) cell death
(B) very little or no effect on cell viability
(C) a significantly decreased mutation rate
(D) a significantly increased mutation rate

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