MTTC Integrated Science Exam Solutions 2024

Independent Variable - Correct Answer The experimental factor that is manipulated; the variable whose effect is being studied. Placed on the x-axis (horizontal) on a graph. Dependent Variable - Correct Answer The variable that is measured in an experiment. Placed on the y-axis (vertical) on a graph. Scientific theory - Correct Answer Must be repeatable. Possible to be disproved and capable of change. Sampling and Sample Size - Correct Answer Random sampling is the preferred, but isn't always possible. A large sample will yield the most accurate information. Manipulating Variables - Correct Answer Only one variable should be manipulated at a time. Control variable - Correct Answer A factor that is held constant to test the relative impact of an independent variable Response to Lab Accident - Correct Answer In most cases, 911 should be called immediately. Response to Fire in a Beaker or Flask - Correct Answer Do not use a fire extinguisher. Just place a watch glass or wet towel over it to cut off Oxygen supply. Guidelines for Dissections - Correct Answer Specimens should be rinsed before using. Latex glover preferred. Avoid use of formaldehyde/dispose of correctly. Need to provide alternative for students with moral objections to assingment. Storing Lab Chemicals - Correct Answer Store all in secured, dry area. Acids locked in separate area. Origin of Biological Sciences - Correct Answer Traced back to ancient Greeks (i.e. Aristotle) Andrea Vesalius - Correct Answer Dissected human bodies; created a book on anatomy Anton van Leeuwenhoek - Correct Answer Father of Microscopy, first to see and describe bacteria, yeast plants, and microscopic life found in water Scanning Electron Microscope (SEM) - Correct Answer Instead of a light, a beam of electrons pass through specimen. Resolution about 1,000 times greater than light microscope. Will kill specimen though.