The ability of DNA polymerase to repair its own nucleotide mismatches is called ____________________
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proofreading
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Most often, the largest gradient in water potential is between
A. roots and soil water. B. root xylem and shoot xylem. C. xylem and phloem. D. leaf cells and the intracellular spaces inside the leaves. E. the relative humidity inside the leaf and the relative humidity outside the plant.
How are temperature sensitive mutants used to determine when genes act during development?
A) Embryos can be shifted to the restrictive temperature to inactivate the mutant gene and the effect of inactivation on subsequent stages can be observed. B) Embryos can be shifted to the permissive temperature to inactivate the mutant gene and the effect of inactivation on subsequent stages observed. C) Embryos can be incubated at the restrictive temperature for several hours. If the embryo develops normally, then the gene product is required during that period of development. D) Embryos can be raised at the permissive temperature and if the embryo does not die, then the gene product is not required for development.
A large increase in exercise (say hiking for 20 miles a day for a week) requires _______________.
a. an increase in oxygen delivery to the muscles b. an increase in nutrient delivery to the muscles c. an increase in ATP levels in the muscles d. a and b are correct e. a, b, and c are correct
________ are small, circular pieces of DNA that are often used in the process of transformation
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