DNA & Science

What was the author’s purpose in writing “The New Science of Solving Crimes”?

• to explain how DNA is used to solve crimes

• to point out problems with using DNA to solve crimes

• to give the history of several old mysteries

• to warn against using DNA databases

According to the first article, why is DNA a great tool for solving crimes?

• because DNA is very tiny

• because your DNA is in your saliva

• because everyone’s DNA is unique

• because analyzing DNA is not expensive

What is the central idea/main idea of the section “Family Trees”?

• Most old mysteries are never solved.

• DNA can be found in parks and gardens.

• Many families send their DNA to testing companies.

• DNA can be used to find relatives of suspects or unknown people.

Based on the first article, which prediction is most likely to come true?

• Every old mystery will be solved.

• People will soon stop using DNA to solve crimes.

• DNA testing companies will soon go out of business.

• Solving crimes will become easier as police collect more DNA.

Based on the second article, which statement about polygraphs is true?

• They are expensive.

• They measure stress.

• They can harm your body.

• They’re used in most criminal cases today.

Both articles support the idea that ______.

• lying makes people nervous

• better polygraphs will be invented

• tools for solving crimes have changed over time

• people leave traces of themselves wherever they go

Based on the first article, why did it take so long to identify the “Unknown Boy”?

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What does “the truth” mean in the article title “The Truth About Lie Detectors”?

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Use one of the vocabulary words to fill in the blank. You must spell it correctly.

In 2021, a new ______ helped solve the mystery of the ‘Unknown Boy.”

Because everyone’s DNA is______, a person’s DNA on a glass can be good evidence that they touched it.