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You are conducting an experiment to determine which type of carbohydrate provides the best  growing conditions for bacteria. You set up 5 growth plates of bacteria. 4 plates each have a         different type of sugar, while the 5th plate has no sugar. What is the purpose of the 5th plate in this  experiment? A) It is the independent variable plate B) This plate will grow the most bacteria because of the lack of sugar C) This plate serves as a control plate to compare growth with the sugar plates D) This plate should not grow any bacteria due to lack of sugar

When sodium and chlorine atoms are bonded together, sodium loses an electron to chlorine. What do we call an atom which has lost an electron and now has a net positive charge?

You are conducting an experiment to determine the effect of music on the anxiety level of mice.  You have 4 enclosures which contain speakers to deliver 3 different types of music to the mice. The    4th enclosure contains no speakers. After 2 hours in their chamber, a simple blood test is performed         to determine the level of cortisol in the blood of each mouse (a measure of stress hormone). What is   the dependent variable in this experiment? A) Cortisol level B) Time kept in the enclosures C) Type of music D) Number of mice in each trial

One major contribution of humans to the evolution of organisms is the use of selective breeding. 

As we have studied the 4 major biomolecules, we have paid close attention to the structures, functions, and examples of each and how they contribute to the health of organisms. In your answer, provide one major function and at least one example of each of the 4 biomolecules (carbohydrates, lipids, proteins, and nucleic acids). Provide your answer in complete sentences. 

Which of the following effects is produced by the high surface tension of water? A) Lakes don’t freeze solid in winter despite low temperatures. B) A water strider can walk across the surface of a small pond. C) Organisms resist temperature changes, although they give off heat due to chemical reactions. D) Evaporation of sweat from the skin helps to keep people from overheating.  

Which of the following represents correctly paired DNA nucleotides? A) Adenine with Thymine B) Adenine with Guanine C) Cytosine with Thymine D) Cytosine with Adenine

You are conducting an experiment to determine the effect of varying levels of caffeine on high school swimmers. You will be varying the amounts of caffeine consumed by each swimmer 1 hour before swimming a 200 meter race. You have already recorded times for each swimmer at a normal practice, without the use of caffeine supplements for comparison to your results.               Use the information provided to correctly match the variables for this experiment.     

You are conducting an experiment to answer the question: How does temperature affect the mass of water? Which of the following would be an appropriate controlled variable for this experiment?

Which of the following properties of water is directly related to water’s ability to form weak hydrogen bonds with other water molecules? A) Property of expansion upon freezing B) Property of cohesion C) Property of water as a universal solvent D) Property of water as a regulator of temperature