Lab Safety Basics in Biology
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Questions and Answers

What is the base unit for measuring mass in the metric system?

  • Gram (correct)
  • Liter
  • Celsius
  • Meter
  • Which measuring device is commonly used for measuring volume in liters?

  • Thermometer
  • Graduated cylinder (correct)
  • Ruler
  • Electronic balance
  • Which prefix in the metric system represents one-thousandth of a unit?

  • Deci-
  • Milli- (correct)
  • Cent-
  • Kilo-
  • What is the standard base unit for measuring length in the metric system?

    <p>Meter</p> Signup and view all the answers

    What should you avoid when measuring with a ruler to ensure accuracy?

    <p>Starting from the end of the ruler</p> Signup and view all the answers

    Which of the following prefixes indicates a quantity of ten?

    <p>Deca-</p> Signup and view all the answers

    Which temperature unit is commonly used in scientific measurements?

    <p>Degrees Celsius</p> Signup and view all the answers

    What is the unit symbol for mass in the metric system?

    <p>g</p> Signup and view all the answers

    What should you do if chemicals splash onto your skin or into your eyes during a lab?

    <p>Use the safety shower or eyewash station and inform the instructor.</p> Signup and view all the answers

    Why is it important to know the location of safety equipment like fire extinguishers and eyewash stations before starting a lab?

    <p>In case of an emergency, quick access can be life-saving.</p> Signup and view all the answers

    What precautions should you take when handling chemicals in the lab?

    <p>Wear safety goggles and rubber gloves.</p> Signup and view all the answers

    How should sharp objects or biohazardous waste materials be disposed of in the lab?

    <p>Place them in puncture-resistant containers.</p> Signup and view all the answers

    Why is it important to never eat, drink, or apply cosmetics in the laboratory?

    <p>Contaminants can lead to serious health risks.</p> Signup and view all the answers

    What is the primary focus of biology as a field of study?

    <p>The systematic study of living phenomena.</p> Signup and view all the answers

    Which of the following describes the role of biologists?

    <p>To observe, ask questions, and design experiments to explain observations.</p> Signup and view all the answers

    What should you do immediately after a spill occurs in the laboratory?

    <p>Ask your instructor about the proper cleanup procedure.</p> Signup and view all the answers

    What should you do if you are unsure about any part of the laboratory investigation?

    <p>Ask your lab instructor for assistance</p> Signup and view all the answers

    Which of the following is NOT a general laboratory safety guideline?

    <p>Use your phone for taking notes</p> Signup and view all the answers

    What should be done immediately if you break a glass item in the lab?

    <p>Notify the lab's instructor for a clean-up procedure</p> Signup and view all the answers

    Why is it important to remove large jewelry and tie back long hair in the lab?

    <p>To reduce the risk of accidents during experiments</p> Signup and view all the answers

    What should you do with materials that have come into contact with biohazardous waste?

    <p>Dispose of them in the proper biohazardous waste container</p> Signup and view all the answers

    Which safety equipment should be worn when instructed during lab activities?

    <p>A lab coat, gloves, and safety goggles</p> Signup and view all the answers

    How should you prepare before arriving at the laboratory?

    <p>Read through the exercises to familiarize yourself with them</p> Signup and view all the answers

    What requirement must be fulfilled before handling laboratory equipment?

    <p>You must have specific permission from the lab instructor</p> Signup and view all the answers

    What instrument is most commonly used to measure mass?

    <p>Triple-beam balance</p> Signup and view all the answers

    How should the meniscus be read when measuring the volume of a liquid?

    <p>At the bottom of the curve of the meniscus</p> Signup and view all the answers

    Which method is appropriate for calculating the volume of a wooden block?

    <p>Length × width × depth</p> Signup and view all the answers

    What is the freezing point of water in Celsius?

    <p>0 degrees Celsius</p> Signup and view all the answers

    When measuring with a ruler, how should you handle significant figures?

    <p>Record all known digits plus the first uncertain digit</p> Signup and view all the answers

    What is the primary use of a graduated cylinder?

    <p>Measuring the volume of liquids</p> Signup and view all the answers

    What is a correct conversion formula between Celsius and Fahrenheit?

    <p>°F = °C × 1.8 + 32</p> Signup and view all the answers

    Which is NOT a tool used for measuring weight or mass?

    <p>Graduated cylinder</p> Signup and view all the answers

    Which variable is considered independent in an experiment testing bacterial growth?

    <p>Temperature at which the experiment is conducted</p> Signup and view all the answers

    What is the dependent variable in the context of bacterial growth experiments?

    <p>The percentage of bacterial growth observed</p> Signup and view all the answers

    Which of the following would be a controlled variable in an experiment on bacterial growth?

    <p>The amount of Substance A used</p> Signup and view all the answers

    What aspect of the experiment could be altered to improve reliability of results?

    <p>Controlling other environmental factors</p> Signup and view all the answers

    When conducting a control test, what is being measured?

    <p>The baseline growth without the experimental variable</p> Signup and view all the answers

    If you observe that the dish with the highest temperature had the least bacterial growth, what can be inferred?

    <p>Higher temperatures may inhibit bacterial growth</p> Signup and view all the answers

    During the experiment, why is it important to estimate bacterial growth as a percentage?

    <p>It allows for a standardized comparison between tests</p> Signup and view all the answers

    Which of the following statements about antibacterial agents is correct in an experimental context?

    <p>The effects of different agents can be compared only in a consistent experiment setup</p> Signup and view all the answers

    Study Notes

    Lab Safety

    • Students should familiarize themselves with lab safety rules and the location of safety equipment.
    • Before entering the lab, students must turn off their cell phones, tie back long hair, remove large jewelry, and wear appropriate attire (closed-toe shoes and lab coat).
    • Students must carefully read and follow all instructions provided by the instructor and seek clarification if needed.
    • Always use proper techniques and protection when handling chemicals, and ensure that any spills are reported to the instructor.
    • Students should always wear gloves and safety goggles when handling chemicals.
    • Never directly smell or mouth pipette any chemicals.
    • Dispose of all used sharp objects and biohazardous waste materials in designated containers.
    • Wash hands before and after lab investigations.
    • Be aware of the locations of safety equipment such as fire extinguishers, fire blankets, first-aid kits, safety showers, and eyewash stations.

    Introduction to Biology and The Scientific Method

    • Biology involves observation, experimentation, and explanation of living phenomena.
    • Students are tasked with designing an experiment to explore the effects of antibacterial agents or temperature on bacterial growth.
    • Key steps in the scientific method include formulating a question, developing a hypothesis, identifying independent and dependent variables, and controlling variables.
    • The independent variable is the factor being manipulated or changed in the experiment, while the dependent variable is the outcome being measured.
    • Controlled variables are kept constant to ensure a fair comparison.

    Scientific Measurements

    • The metric system is used for scientific measurements, using base units like meters for length, grams for weight/mass, and liters for volume.
    • Length is measured using rulers, focusing on precision and recording all known digits and the first uncertain digit.
    • Weight/mass is measured using balances, such as triple-beam balances or top-loading scales.
    • Liquid volume is measured using graduated cylinders or pipettes, reading the volume at the bottom of the meniscus.
    • Solid object volume can be calculated using formulas, for example, volume of a wooden block = length x width x depth.
    • Temperature is measured using scientific thermometers calibrated in Celsius (°C), with water boiling at 100 °C and freezing at 0 °C.
    • Formulas exist to convert between Celsius and Fahrenheit scales.
    • When taking measurements, students should use significant figures, recording all known digits and the first uncertain digit.

    Taking Measurements

    • Students are tasked with measuring the length and width of different geometric shapes using a metric ruler.
    • Measurements must be recorded using significant figures.
    • The area of the geometric shapes needs to be calculated using the measurements obtained, and the formula area = width x length.

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    Description

    This quiz covers essential lab safety rules and procedures every student should know before entering a biology lab. It emphasizes the importance of proper attire, usage of safety equipment, and correct handling of chemicals. Ensure you understand these practices to maintain a safe learning environment.

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