Cohesion and Clarity
12- 34
Article Practice
Fill in the blanks with a, an, the, or Ø . Solutions can be found at the end of the chapter.
1. _____ M/mutations are _____ flaws that occur in _____ genes.
2. Many scientists believe that _____ release of _____ chlorofluorocarbons into _____ atmosphere has
caused _____ earth’s ozone layer to thin.
3. _____ L/long exposure to _____ UV-A light will damage _____ skin and cause _____ cancer.
4. _____ R/radiation therapy is _____ use of ionizing radiation to treat cancer.
5. _____ C/clinical trial can be conducted at _____ single hospital or in dozens of _____ health centers in
_____ several countries.
6. In 1984, _____ first strain of _____ transgenic mice was developed. _____ T/transgenic mouse — a mouse
that contains _____ gene from another animal — is produced by introducing _____ foreign gene into ____
egg that produces _____ mouse. _____ T/transplanted gene then becomes a permanent part of _____
animal’s genetic makeup. In this way, _____ scientists can study _____ influence of a particular gene on
_____ 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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