science icon Name ________________________________
1. The graph shows the percentage of hemoglobin that combines with carbon monoxide (CO) at various concentrations. Exposure to 400 parts per million of CO in air can cause people to experience nausea and a throbbing headache. According to the graph, about what percentage of hemoglobin is bound to CO at a CO concentration of 400 parts per million?
O   a. 25%
O   b. 35%
O   c. 40%
O   d. 55%
2. Which of these diagrams represent a cell capable of making sugar?
O   a. Cell A
O   b. Cell B
O   c. Cell C
O   d. Cell D
3. Two test tubes were filled with a solution of bromthymol blue. A student exhaled through a straw into each tube, and the bromthymol blue turned yellow. An aquatic plant was placed into each tube, and the tubes were corked. One tube was placed in the dark, and one was placed in direct sunlight. The yellow solution in the tube in sunlight turned blue, while the one in the dark remained yellow.

Which statement best explains why the solution in the tube placed in sunlight returned to a blue color?

O   a. Oxygen was used in photosynthesis.
O   b. Oxygen was removed by respiration.
O   c. Carbon dioxide was removed by photosynthesis.
O   d. Carbon dioxide was produced by respiration.

Use the strep throat information below to answer questions 4 - 7.

For ten years, Dr. Cross has been using the same antibiotic to treat strep throat infections. This year she became concerned because an increasing number of patients with strep throat infections were not responding to the antibiotic. She was concerned that the streptococcus bacteria, which cause strep throat, were becoming resistant to the antibiotic, resulting in a decrease in the percentage of successfully treated cases.

Dr. Cross checked all the files of patients she had treated for strep throat infection over the previous ten years. She then compiled a table that showed the results of treatment using the antibiotic.

4. How many cases of strep throat did Dr. Cross treat in the first year?
O   a. 57
O   b. 120
O   c. 96
O   d. none of these
5. What was the first year in which bacteria did not respond to the antibiotic Dr. Cross used?
O   a. 1990
O   b. 1994
O   c. 1999
O   d. none of these
6. What percentage of cases did not respond to treatment in 1997?
O   a. 0
O   b. 13
O   c. 15
O   d. none of these
7. What organism is responsible for causing strep throat?
O   a. streptococcus bacteria
O   b. streptobacillus bacteria
O   c. antibiotics
O   d. none of these
8. The table shows the rate of water loss in four different plants. Which of these statements is supported by the data?
O   a. Plant A is adapted for a dry climate.
O   b. Plant B is a flowering plant.
O   c. Plant C is a dicot.
O   d. Plant D has a high rate of photosynthesis.
Plant Liters of Water
Lose Per Day
Plant A       0.02
Plant B       1.00
Plant C       12.00
Plant D       19.00