<span>A characteristic shared by enzymes, hormones, and antibodies is that their function is determined by the shape of their molecules.</span>
Genetic testing can be used to tell if a person carries mutation of the CF (cystic fibrosis) gene. The test looks at a person's DNA, which is taken from cells in a blood sample or from cells that are gently scraped from inside the mouth.
Extra fact: More than 10 million Americans are carriers of one mutation of the CF gene.
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Answer:
By keeping them in a clean store
