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Life Sci - Chap 1&2
study guide
| Question | Answer |
|---|---|
| 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
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