Question 1

Question 1: CATCHING THE KILLERS

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

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 2

Question 2: CATCHING THE KILLER S

The newspaper article says that, except for identical twins, there is only a 1 in 100 million 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

Answer

Anna and Tom, but not Gina.

Answer

Gina and Anna, but not Tom.

Answer

All three students.

Question 3

CATCHING THE KILLER

Accepted Answer

They are the only place where DNA can be found.

Answer

Both samples contain red blood cells.

Answer

Both samples contain cells with nuclei.

Answer

Both samples contain body fluids.

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