An F' plasmid results when
A. an integrated F plasmid is incorrectly excised, bringing host genes with it.
B. an F+ × F- mating is interrupted before completion.
C. an Hfr × F- mating is interrupted before completion.
D. None of the choices are correct.
Answer: A
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The current mass extinction is believed to be primarily caused by
a) human actions b) rising sea levels c) plate tectonics d) asteroid impact e) reduction in the amount of oxygen in the atmosphere
The ATP that is produced in the light reactions is used by the cell to
A. reproduce and grow. B. build carbohydrate molecules. C. move electrons through the electron transport chain. D. split water into H+ and O2.
Gene testing allows the parents to learn more about their child in the prenatal period. However, there are genetic disorders, such as Huntington's disease, that show no phenotypic signs until age 35. This disease is caused by a dominant allele, resulting
in degeneration of the brain, muscle spasms, and death within a decade or two. Because it is caused by a dominant allele, 50% of the offspring will carry the disease. If you knew that someone in your family had Huntington's disease, would you get tested early on, before you start a family and have your own children? Would you rather not know your fate, even if it means that you may pass the dominant allele of this disease to your offspring? (Note: Before being tested, a person usually undergoes a battery of psychological tests to make sure that he or she is emotionally stable enough to deal with knowing that he or she will develop the disease and that there is no cure.) What will be an ideal response?
Answer the following questions true (T) or false (F)
1. Chemical reactions involve only the outermost electrons of an atom. 2. Ionic bonds occur through a sharing of electrons. 3. Acids release hydrogen ions into aqueous solutions.