Chapter 5. 5·1–5·5 DNA: what is it, and what does it do?

Show What You Know - Self Quiz

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You must read each slide, and complete any questions on the slide, in sequence.

Instructions

Check your understanding of concepts from 5·1–5·5 DNA: what is it, and what does it do? by answering the following questions.

1.

1. Considering the principle of complementary base pairing, you would expect an equal ratio of which two nitrogenous bases in a DNA molecule?

cytosine and guanine

adenine and guanine

guanine and thymine

uracil and adenine

thymine and cytosine

Correct! (See section 5·2 The DNA molecule contains instructions for the development and functioning of all living organisms.)

Incorrect. (See section 5·2 The DNA molecule contains instructions for the development and functioning of all living organisms.)

2.

2. If you thought about DNA as the book of life, then:

the sugars are the words, the phosphate groups are the paper, and the bases are the covers.

the phosphate groups are the words and the sugars and bases are the binding.

the sugars and phosphate groups are the words and the bases are the binding.

the bases are the words and the sugars and phosphate groups are the binding.

the bases and sugars are the words and the phosphate groups are the binding.

Correct! (See section 5·2 The DNA molecule contains instructions for the development and functioning of all living organisms.)

Incorrect. (See section 5·2 The DNA molecule contains instructions for the development and functioning of all living organisms.)

3.

3. What is the most common reason that DNA analyses overturn incorrect criminal convictions?

Two-thirds of incorrect criminal convictions are the result of prosecutorial misconduct, and DNA evidence cannot be used improperly by prosecutors.

DNA analytical technology has improved markedly over the last decade, so cases in which earlier DNA analysis had been used to convict a defendant, more modern DNA analysis has overturned that conviction.

In more than three-quarters of the cases overturned by DNA analysis, inaccurate eyewitness testimony played an important role in the original guilty verdict.

Most juries have an irrational bias in favor of DNA evidence.

Two-thirds of incorrect criminal convictions are the result of defense attorney incompetence, and DNA evidence cannot be used improperly by defense attorneys.

Correct! (See section 5·1 Knowledge about DNA is increasing justice in the world.)

Incorrect. (See section 5·1 Knowledge about DNA is increasing justice in the world.)

4.

4. Most genes come in alternative forms called:

chromosomes.

gametes.

alleles.

heterozygotes.

homozygotes.

Correct! (See section 5·3 Genes are sections of DNA that contain instructions for making proteins.)

Incorrect. (See section 5·3 Genes are sections of DNA that contain instructions for making proteins.)

5.

5. A person’s DNA is carried in:

saliva.

hair.

skin cells.

blood.

All of the above contain a person’s DNA.

Correct! (See section 5·1 Knowledge about DNA is increasing justice in the world.)

Incorrect. (See section 5·1 Knowledge about DNA is increasing justice in the world.)

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