GACE Science Practice Test 23pages

A researcher is studying the response of bacteria to a certain chemical. In 3 experiments, the bacteria swim towards the chemical, and in one experiment the bacteria swims away from it. What would be the most appropriate next step for the researcher. a. Report only the 1st three experiments. b. Report all the experiments but refrain from making any conclusions. c. Repeat the experiment several more times and apply a statistical analysis to the data. d. Repeat the experiment, adding a new chemical to determine its effect on the bacteria. - ANS - C In a study investigating the cause of stomach ulcers, researchers observed that coffee drinkers had a higher incidence of stomach ulcers than those who didn't drink coffee. This is an example of: a. a controlled experiment b. a cause and effect relationship c. correlation between two variables d. systematic error in sampling - ANS - C In terms of mass, which of the following represent the greatest amount of sucrose (Molar mass=342 grams)? a. 1 mole b. 100 grams c. 1L of a 0.1M solution c. 100mL of a 1M solution - ANS - A In an experiment on respiration, carbon dioxide production is measured over time. Placing the data in a chart is a. A visual representation of the data b. a conclusion based on the data