Science pre-test

Which of the following is an example of genetic engineering?

• Attaching the root of one plant to the stem of another

• Inserting a gene into plants to make them resistant to insects

• Growing a whole plant from a single cell

• Finding the sequence of bases from DNA

These graphs show the monthly precipitation and average temperature for three cities in the United States over the course of one year. Based on the graphs, which city has the greatest annual range of temperatures?

• Chicago

• Los Angeles

• New York

• They all have the same annual range of temperature

When large areas of forest are removed so land can be converted for other uses, such as farming, which of the following occurs?

• Increase erosion

• Decrease carbon dioxide

• Colder temperature

• Increase oxygen production

The time a computer takes to start has increased dramatically. One possible explanation for this is that the computer is running out of memory. This explanation is a scientific …

• Experiment

• Hypothesis

• Observation

• Conclusion

Which of these is a major concern about the overuse of antibiotics?

• It can lead to antibiotic resistance bacteria

• There will be an antibiotic shortage

• Antibiotics can cause secondary infections

• Antibiotics will get into the water system

An antacid relieves an overly acidic stomach because the main components of antacids are …

• Bases

• Acid

• Isotopes

• Neutral

A car travels at a constant speed of 40 miles per hour. How far does the car travel in 45 minutes?

• 25

• 30

• 35

• 40

A scientist is conducting a study to determine how well a new medication treats ear infections. The scientist tells the participants to put 10 drops in their infected ear each day. After two weeks, all participants' ear infections had healed. Which of the following changes to the design of this study would most improve the ability to test if the new medication effectively treats ear infections?

• Create a second group of participants who use 15 ear drops a day.

• Create a second group of participants who do not use any eardrops

• Have participants put eardrops in both their infected ear and healthy ear

• Have participants use eardrops for one week.

Many diseases have an incubation period. Which of the following best describes what an incubation period is?

• The period in which someone builds up immunity

• The effect of a disease on babies

• The recovery period after getting sick

• The period in which someone has the disease, but no symptoms

Oil, natural gas and coal are examples of …

• Biofuels

• Geothermal resources

• Fossil fuels

• Renewable resources