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Biology Midterm
| Question | Answer |
|---|---|
| What is the main difference between a qualitive and quantative observation? | Quantative is more objective and gives a definte number. Qualitive is is based on quality and varies by people's opinions. |
| How did the design of Pasteur's flask help him successfully refute past experiments? | He designed a flask that remained open to the air, but microorganisms from the air couldn't get in the flask. He showed that as long as the broth was protected from microorganisms, it remained free of living things. |
| Living things share several characteristics including what? | -Made up of units called cells-Ability to reproduce-Are based on a universal genetic code-Grow and develop-Obtain and use materials and energy-Respond to their environment-Maintain a stable internal environment-As a group change over time |
| What common system of measurement do scientists throughtout the world use? Why is it necessary to use a common system of measurement? | Metric System. Scientists need a common measurement system because they replicate each other's experiments and can't always be converting to their own systems because data could get changed. |
| A scientist wants to study the way a microscopic, unicellular organism moves. What are 2 reasons that the scientist should choose a compound light microscope rather than an electron microscope for making their observations? | 1. You can't see live organisms with an electron microscope.2. They produce a clear image of objects at a magnification of 1000 times. |
| What are the first 4 levels of organization and a description of each. | Molecules-groups of atoms; smallest unit of most chemical compoundsCells-smallest functional unit of lifeGroups of Cells-tissues, organs, and organ systemsOrganism-inividual living thing |
| What are the last 4 levels of organization and a descrption of each. | Population-group of organisms of one type that live in the same areaCommunity-populations that live together in a defined areaEcosystem-community and its nonliving surroundingsBiosphere-the part of Earth that contains all ecosystems |
| What are the 4 groups of organic compounds found in living things? | 1. carbohydrates2. proteins3. lipids4. nucleic acids |
| What are the 2 kinds of nucleic acids? | RNA & DNA |
| Living things use carbohydrates for what reason? | as a source of energy |
| Plants and some animals use carbohydrates for what reason? | for structual purposes |
| Chemists call the energy that is needed to get a reaction started the what? | activation energy |
| What are proteins that act as bilogical cayalysts? They speed up chemical rections that take place in cells. | enzymes |
Created by:
cesca
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