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Life Sci - Chap 1&2

study guide

What is life science? the study of living things
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
What is a hypothesis? an educated guess
How do you test a hypothesis? by using a controlled experiment
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.
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
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
Microscope parts: ocular lens (eye piece) what you look through - it magnifies
objective lens magnifying glasses/makes objects look closer/bigger the lens=more magnification
diaphragm also known as light condenser - controls the amount of light coming through the stage
stage place to put slide/specimen
stage clip holds slide in place
nose piece holds the objective lenses
course adjustment knob lets you adjust the stage or magnification/this is largest change in magnification/you can see movement
fine adjustment knob final focus/makes what you are viewing look as clear as possible/little movement
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
metric system - base units, etc length meters
area length x width / m2
volume cubic centimeters/cm3 or liters
mass kilograms
temperature Kelvin (K) or Celcius (C)
Characteristics of living things cells all living have to have cells-basic level of life
responds to change stimulus - change that affects the activity of an organism-reacting homeostasis - maintaining a stable internal environment-balance
reproduction sexual - 2 parents asexual - 1 parent
DNA - heredity all living things contain DNA in their cells
energy-metabolism total of all the chemical activities that the organism performs
grow and develop living things need to grow and develop
Necessities of life water water composes a good part of all living things
air - CO2 & O2 need air to breathe, carry out life functions
a place to live need shelter from the elements
food need nourishment to keep cells developing producers - make their own food consumers - eat other plants/animals decomposers - break down nutrients in dead organisms
proteins - amino acids needed to build and repair body structures
carbohydrates source of energy and energy storage
lipids - fats store energy
nucleic acid-DNA blue prints of life
Created by: msparks