MTTC Integrated Science Exam Question with correct answers 2023

MTTC Integrated Science Exam Question with correct answers 2023Independent Variable The experimental factor that is manipulated; the variable whose effect is being studied. Placed on the x-axis (horizontal) on a graph. Dependent Variable The variable that is measured in an experiment. Placed on the y-axis (vertical) on a graph. Scientific theory Must be repeatable. Possible to be disproved and capable of change. Sampling and Sample Size Random sampling is the preferred, but isn't always possible. A large sample will yield the most accurate information. Manipulating Variables Only one variable should be manipulated at a time. Control variable A factor that is held constant to test the relative impact of an independent variable Response to Lab Accident In most cases, 911 should be called immediately. Response to Fire in a Beaker or Flask Do not use a fire extinguisher. Just place a watch glass or wet towel over it to cut off Oxygen supply. Guidelines for Dissections 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 Store all in secured, dry area. Acids locked in separate area. Origin of Biological Sciences Traced back to ancient Greeks (i.e. Aristotle) Andrea Vesalius Dissected human bodies; created a book on anatomy Anton van Leeuwenhoek Father of Microscopy, first to see and describe bacteria, yeast plants, and microscopic life found in water Scanning Electron Microscope (SEM) Instead of a light, a beam of electrons pass through specimen. Resolution about 1,000 times greater than light microscope. Will kill specimen though.