study guide
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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What is life science? | the study of living things
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Describe the scientific method. List the steps involved. | Scientific methods are how scientists solve problems. Steps of the scientific method include ask a question, make an observation, form a hypothesis, test the hypothesis, analyze the results, draw conclusions, communicate results
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What is a hypothesis? | an educated guess
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How do you test a hypothesis? | by using a controlled experiment
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What do you do if the hypothesis is correct or incorrect? | If correct, repeat the experiment to see if you get the same results, and if incorrect, either adjust your hypothesis or redo the experiment.
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Explain what variables are involved in a scientific method. a. experimental variable. b. controlled variable | experimental variable - variable that is being tested
controlled variable - variable that stays the same in an experiment
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Why is the metric system (SI) of measurement an important tool in science? | Because scientists around the world use the same measurements so it is easy to share results of experiments
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Microscope parts: ocular lens (eye piece) | what you look through - it magnifies
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objective lens | magnifying glasses/makes objects look closer/bigger the lens=more magnification
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diaphragm | also known as light condenser - controls the amount of light coming through the stage
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stage | place to put slide/specimen
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stage clip | holds slide in place
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nose piece | holds the objective lenses
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course adjustment knob | lets you adjust the stage or magnification/this is largest change in magnification/you can see movement
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fine adjustment knob | final focus/makes what you are viewing look as clear as possible/little movement
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Explain the differences between a compound light microscope and electron microscope | compound - uses light to view objects that can be living; electron - focuses a beam of electrons to magnify objects - cannot view living things
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metric system - base units, etc length | meters
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area | length x width / m2
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volume | cubic centimeters/cm3 or liters
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mass | kilograms
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temperature | Kelvin (K) or Celcius (C)
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Characteristics of living things cells | all living have to have cells-basic level of life
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responds to change | stimulus - change that affects the activity of an organism-reacting
homeostasis - maintaining a stable internal environment-balance
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reproduction | sexual - 2 parents
asexual - 1 parent
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DNA - heredity | all living things contain DNA in their cells
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energy-metabolism | total of all the chemical activities that the organism performs
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grow and develop | living things need to grow and develop
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Necessities of life water | water composes a good part of all living things
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air - CO2 & O2 | need air to breathe, carry out life functions
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a place to live | need shelter from the elements
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food | need nourishment to keep cells developing
producers - make their own food
consumers - eat other plants/animals
decomposers - break down nutrients in dead organisms
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proteins - amino acids | needed to build and repair body structures
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carbohydrates | source of energy and energy storage
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lipids - fats | store energy
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nucleic acid-DNA | blue prints of life
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Created by:
msparks
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