17.9 Using genes_1

Malaria victims used to buy medicines to help them recover.

They were very cheap.

Unfortunately,

these medicines no longer work.

Why

• most populations of the protozoa are resistant,

• most populations of the protozoa are died

• most populations of the protozoa are change

The best cure for malaria is an expensive chemical called ...............................

• artemisinin

• insulin

• iodin

• non of all

The best cure is an expensive chemical called artemisinin.

To stop resistance to this chemical developing,

it is mixed with other chemicals to make a medicine called .............................

• ACT

• DRACT

• TAC

Microbes .................... develop resistance to more than one chemical at once,

• always

• rarely

• never

The best cure is an expensive chemical called artemisinin.

Why it is expensive?

• It is rare in the world

• Difficult to extract

US scientists used

....................................

to produce artemisinin more cheaply.

• genetic engineering

• natural breeding

• selective breeding

US scientists used

genetic engineering

to produce artemisinin more cheaply.

Scientists found the genes

that plants use to make the chemical,

and put them into ............................................. cells.

• bacterial

• plant

• yeast

• animal

Artemisia plants take more than a year to grow,

but yeast cells reproduce .......................

• quickly

• slowly

Where does artemisinin come from and why is it expensive?

• USA

• China

• India

• Africa

The diagram shows how the artemisinin gene can be added to bacteria.

Show where the following labels should go.

A

• Genes for the enzymes that make artemisinin are taken from artemisia plants.

• Bacterial plasmids are removed and cut open.

• Genes from artemisia plants are added to the bacterial DNA.

• The bacterial plasmid is put back into the bacteria.