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Unit 1- Scientific methods/ Chemistry of life

Quiz by Eric Edwards

Grade 9 - 12
Science
Florida Standards

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50 questions
Show answers
  • Q1
    Valerie designed and conducted an experiment on pothos plants, which are common houseplants. Her hypothesis is that the direction of light will affect the growth pattern of a pothos plant. To test the hypothesis, she sets up two test groups of pothos plants and observes them three weeks later. The table summarizes the test groups and observations. What are the roles of the two test groups in this investigation?
    Question Image
    Both are experimental groups, and each individually shows the effect of the direction of light.
    Both are control groups, but only Test Group 1 shows the effect of the direction of light.
    One is the experimental group and one is the control group, and together they show the effect of the direction of light.
    Both are experimental groups, but only Test Group 1 shows the effect of the direction of light.
    120s
  • Q2
    Valerie designed and conducted an experiment on pothos plants, which are common houseplants. Her hypothesis is that the direction of light will affect the growth pattern of a pothos plant. To test the hypothesis, she sets up two test groups of pothos plants and observes them three weeks later. The table summarizes the test groups and observations. After analyzing the results of the experiment, Valerie asks if her hypothesis should be classified as a theory. Which is the best response to Valerie’s question?
    Question Image
    No, because the experiment did not provide enough data to support the hypothesis.
    No, because a theory is a highly reliable explanation that incorporates many well-tested hypotheses.
    Yes, because her data support the hypothesis.
    Yes, but only if additional experiments show similar results.
    120s
  • Q3
    Evolutionary theory has become the central organizing principle of biological science. Could this scientific theory ever become a scientific law?
    No, because a theory can be proven correct while a law cannot be proven.
    Yes, if the theory is shown to predict future events.
    Yes, if scientists decide that enough evidence supports the theory.
    No, because a theory is a complex explanation that does not become a law.
    120s
  • Q4
    A griffin is a mythical creature that appears in many stories. It has the head of an eagle and the body of a lion. What role, if any, could the griffin have in the science of biology?
    The griffin could be cited as evidence to evaluate a hypothesis or theory.
    The griffin has no role in biology, because it is not real.
    The griffin could be the subject of an investigation of animals.
    The griffin could be used to test new ideas about animal structures or behaviors.
    120s
  • Q5
    After a team of scientists completes an investigation, they submit an article about the investigation to a scientific journal. Before the journal publishes the article, they send it to other scientists for an anonymous, independent review. What is the purpose of this review?
    to guarantee that the conclusions of the investigation are correct
    to make sure the investigation has practical, economic benefits
    to improve the appeal of the article to the general public
    to evaluate the methods and test the results of the investigation
    120s
  • Q6
    When news of a scientific discovery is reported, readers must assess the credibility of the claim. For scientific discoveries in general, which statement indicates a valid and credible claim?
    The scientist aimed for precision and accuracy by using a small sample size.
    The scientist followed strict standards of investigation and scientific methodology throughout the research.
    The scientist assured that the experiment was broad in scope by testing many variables in each trial.
    No other scientists replicated the experiment to avoid the legal issues of patent infringement.
    120s
  • Q7
    In 1999, teams in Colorado and California were working together to put NASA’s Mars Climate Orbiter in orbit around Mars. The mission of the orbiter was to look for evidence of water. One team used English units of measurement. The other team used metric measurement. As a result, the spacecraft was lost. What would be the simplest and most cost-effective way to avoid mistakes like this in the future?
    NASA should coordinate all missions with the European Space Agency.
    Another office should oversee every aspect of missions.
    Missions should be run by only one facility.
    All personnel and missions should use the metric system.
    120s
  • Q8
    Refer to the following diagram. The diagram is a model of the structure of glucose. Which is a primary function of glucose molecules?
    Question Image
    to make up the structure of cell membranes
    to provide energy for cell activities
    to act as a catalyst for chemical reactions
    to encode genetic information
    60s
  • Q9
    Refer to the following diagram. The diagram is a model of the structure of glucose. What is true about the structure of this molecule?
    Question Image
    There are strong bonds between carbon atoms that cannot be broken
    It has ionic bonds between carbon atoms and oxygen atoms
    There is a presence of double covalent bonds between carbon atoms
    It has a ratio of 1 carbon atom to 2 hydrogen atoms to 1 oxygen atom
    60s
  • Q10
    Roger is comparing a model of a sugar molecule to a model of an amino acid. Which of the following evidence statements would be supported by the two models?
    Sugars and amino acids are made of exactly the same elements.
    Sugars and amino acids are made of the same elements except amino acids also contain nitrogen and sulfur.
    Sugars and amino acids are made of the same elements except sugars also contain phosphorus.
    Sugars and amino acids have the same structure.
    120s
  • Q11
    Many cells make and use an enzyme, called catalase, to facilitate the decomposition of hydrogen peroxide (H2O2). The products of the decomposition are hydrogen (H2) and oxygen (O2). What is the effect of catalase on the decomposition of hydrogen peroxide?
    It decreases the activation energy needed to start the reaction.
    It changes the ratio of the amounts of the two products.
    It increases the total energy absorbed by the reaction.
    It decreases the total energy released by the reaction.
    120s
  • Q12
    Many cells make and use an enzyme, called catalase, to facilitate the decomposition of hydrogen peroxide (H2O2). The products of the decomposition are hydrogen (H2) and oxygen (O2). Which of these changes to the cell would cause the greatest reduction in the activity of catalase?
    a return of pH to the normal range.
    an increase or decrease in pH beyond normal range.
    a decrease in the concentration of hydrogen and oxygen.
    an increase in the concentration of hydrogen peroxide.
    120s
  • Q13
    Water has many special properties, such as a high heat capacity and cohesive behavior. Which of the following best explains why water has these properties?
    The atoms of a water molecule are held together by ionic bonds.
    Water is a weak acid and acts as a buffer.
    Water molecules are polar and form hydrogen bonds.
    Water molecules join together to form polymers.
    60s
  • Q14
    Lee and Marisol are conducting a science experiment to identify different kinds of macromolecules in food. They prepare the following table to help them remember the chemical reactions that indicate the presence of each type of macromolecule they are studying. Suppose that one of the substances they are testing turns bright red when they add a few drops of Sudan stain. What is the basic molecular structure of the substance?
    Question Image
    Glycerol combined with long chains of fatty acids
    short carbon chain or ring in which the ratio of carbon, hydrogen, and oxygen is 1 : 2 : 1
    strings of amino acids held together with peptide bonds
    polymer made up of many monosaccharides
    120s
  • Q15
    A cellular enzyme is effectively deactivated by an increase in temperature of 10°C. Which is the most likely mechanism of the deactivation?
    The enzyme reacts with the substrate to produce side products.
    The enzyme, which is a protein, breaks apart into individual amino acids.
    The enzyme, which is a carbohydrate, breaks apart into glucose molecules.
    The enzyme changes shape and is no longer able to bind the substrate.
    120s

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