Cohesion and Clarity
12- 43
Article Practice Answer Key
Fill in the blanks with a, an, the, or Ø.
Ø Mutations are Ø flaws that occur in Ø genes.
1.
2. Many scientists believe that the release of Ø chlorofluorocarbons into the atmosphere has caused the earth’s ozone layer to thin.
Ø Long exposure to Ø UV-A light will damage the skin and cause Ø cancer.
3.
Ø Radiation therapy is the use of ionizing radiation to treat cancer.
4.
5. A clinical trial can be conducted at a single hospital or in dozens of Ø health centers in Ø several countries.
6. In 1984, the first strain of Ø transgenic mice was developed. A transgenic mouse — a mouse that contains a gene from another animal — is produced by introducing a foreign gene into the egg that produces the mouse. The transplanted gene then becomes a permanent part of the animal’s genetic makeup. In this way, Ø scientists can study the influence of a particular gene on Ø tumor development.
Exercise and some examples adapted from Ward DE. The Cancer Handbook: A Guide for the Nonspecialist. Columbus, OH, Ohio State University Press, 1995.
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