When scientists copy DNA, they first have to cut out the part they want to

copy. What molecule do they use to do this?

O

A. Reverse transcriptase A

B. Gel electrophoresis

O

C. DNA polymerase

O

D. Restriction endonuclease

What percentage of dietary iron is absorbed from mixed (i. e., those that also contain meat) diets?

Bacterial cells have no what

What type of dressing is most beneficial in keeping a wound moist and providing a barrier against disease transmission?

The area of shoreline that is ultimately exposed and submerged is the

What does the immune system protect the body against? O changes of the internal body temperature O changing environmental conditions O changes caused by harmful pathogens O changes in the pH of the blood

Which of the following is descriptive of pertussis? a. Initial stage resembling the common old b. Prolonged illness, sometimes symptoms may last for months. c. Bacterial disease treated with erythromycin c. All of these are descriptive of pertussis

Which statement about the cell membrane is true? A. It contains cellulose and sugars that are involved in communication. B. It is present in animal cells only. C. It is rigid and elastic for supporting the cell's shape. D.

Hailey needs to identify internal costs so she can price her product accordingly. Which cost will be part of Hailey's calculation? A. cost of endangering species B. cost of deforestation C. cost of air pollution D. cost of disposing by-products E.

What is the main difference between prokaryotic and most eukaryotes cells? A. Eukaryotic cells from multi-cell tissues, Prokaryotic cells are single cell. B. Eukaryotic cells from single cell, Prokaryotic cells are multi-cell tissues. C.

List (A) the primary materials necessary for and (B) The materials produced by photosynthesis