Chapter 9 Biology

Scientists use several techniques to manipulate

• RNA

• restriction maps

• DNA

• enzymes

How do bacteria protect themselves against viruses?

• they can't

• They produce acids that dissolve viral DNA.

• They have restriction maps to help.

• They produce enzymes that cut up viral DNA.

Genetic screening is used to look for specific genes or ___ that indicate a particular disorder.

• viruses

• enzymes

• proteins

• all answers are correct

The polymerase chain reaction rapidly

• deletes faulty genes.

• copies segments of DNA.

• copies individual RNA bases.

• copies individual DNA bases.

A DNA fingerprint is a type of

• restriction enzyme.

• restriction site.

• restriction map.

• all answers are correct

Restriction maps show

• sites of DNA fragments.

• only the thickness of DNA fragments.

• the individual nucleotides in fragments of DNA.

• the length of DNA fragments.

In gel electrophoresis, DNA

• is cut with restriction enzymes.

• is separated according to fragment size by an electric curreent

• fragments are pulled toward the positive electrode by gravity.

• answer not given

Polymerase chain reaction is a techniques that produces many copies of

• individual bases in a short amount of time.

• very long strands of DNA in just a few hours.

• a specific RNA sequence in a few hours.

• a specific DNA sequence in a few hours.

A plasmid that contains a foreign gene is

• recombinant DNA.

• recombinant cell.

• genetic engineering.

• all answers are correct

An organism with recombinant DNA is

• a clone.

• the result of a gene knockout.

• transgenic.

• a plasmid.