1 Which statement describes the best procedure to determine if a vaccine for a disease in a certain bird species is effective?

(1) Vaccinate 100 birds and expose all 100 to the disease.
(2) Vaccinate 100 birds and expose only 50 of them to the disease.
(3) Vaccinate 50 birds, do not vaccinate 50 other birds, and expose all 100 to the disease.
(4) Vaccinate 50 birds, do not vaccinate 50 other birds, and expose only the vaccinated birds to the disease.

1         2         3         4        

2 Diagrams, tables, and graphs are used by scientists mainly to

(1) design a research plan for an experiment
(2) test a hypothesis
(3) organize data
(4) predict the independent variable

1         2         3         4        

A biologist observed a plant cell in a drop of water as shown in diagram A. The biologist added a 10% salt solution to the slide and observed the cell as shown in diagram B.

The change in appearance of the cell resulted from

1 more salt moving out of the cell than into the cell
2 more salt moving into the cell than out of the cell
3 more water moving into the cell than out of the cell
4 more water moving out of the cell than into the cell

1         2         3         4        

4 A coverslip should be used for preparing a

1 frog for dissection
2 solution of iodine for food testing
3 wet mount of elodea (a simple plant)
4 test to determine the pH of a solution

1         2         3         4        

5 A sample of food containing one type of a large molecule was treated with a specific digestive enzyme. Nutrient tests performed on the resulting products showed the presence of simple sugars, only. Based on these test results, the original large molecules contained
in the sample were molecules of

(1) protein             (3) starch
(2) glucose             (4) DNA

1         2         3         4        

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