Question 1

Question 1: CATCHING THE KILLER

This newspaper article refers to the substance DNA. What is DNA?

Accepted Answer

A chemical substance that contains the instructions to build our bodies.

Answer

A protein found in the blood that helps carry oxygen to all the tissues.

Answer

A hormone in blood that helps regulate glucose levels in the body cells.

Answer

A chemical substance in cell membranes that stops the cell contents leaking out.

Question 2

Question 2: CATCHING THE KILLER

The newspaper article says that, except for identical twins, there is only a 1 in 100million chance that two people will have the same DNA profile. Three students each gave an explanation of why there is such a variety of DNA.

Gina said that a person's DNA is made up at conception. It is not inherited.

Anna said that DNA can be altered by mutations to produce many different forms.

Tom said that each person gets a new mix of DNA as half comes from each parent.

Which one or more of the students gave a correct explanation?

Accepted Answer

Anna and Tom, but not Gina.

Answer

Answer

All three students.

Answer

Gina and Anna, but not Tom.

Question 3

Question 3: CATCHING THE KILLER

DNA is to be extracted from a blood sample and from cheek scrapings.

What is the reason why DNA will be found in both samples?

Accepted Answer

Both samples contain cells with nuclei.

Answer

They are the only place where DNA can be found

Answer

Both samples contain body fluids.

Answer

Both samples contain red blood cells.

Question 4

Question 4: CATCHING THE KILLER

Which one of the following questions cannot be answered by scientific evidence?

Accepted Answer

Why was the victim stabbed many times?

Answer

Do all identical twins have exactly the same DNA profile?

Answer

Is taking cheek scrapings a safe way to collect DNA samples?

Answer

What was the medical or physiological cause of the victim’s death?

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