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1-2
Biology
| Question | Answer |
|---|---|
| What is a hypothesis? | A possible explanation for what has been observed |
| Simple experiments generally isolate and test one ______ at a time. | variable |
| Why is a control needed in an experiment? | a comparison of results when changing the variable |
| The results of the experiment did not support the hypothesis. What should you do next? | reject the original hypothesis and develop a new hypothesis. |
| DNA is a molecule that directly allows a living thing to: | store information |
| Living systems exhibit a combination of _____ and _______ | complexity and organization |
| what is the difference between living and non living? | complexity, reproduce, grow, stimulation |
| What is considered the universal molecule of life? | DNA |
| Def: DNA | Deoxyribonucleic acid |
| ____ is the basis of evolution | natural selection |
| ___ are the smallest unit of an element | atom |
| ____ are the smallest unit of life | cell |
| what 2 parts of an atom generally have the same number of components? | protons and neutrons |
| Protons have a ___ charge, neutrons have a ___ charge and electrons have a ___ charge | *positive *neutral *negative |
| ___ is the only atom w/out a neutron | Hydrogen |
| The atomic number is equal to the number of: | Protons |
| ___ and ___ are the simplest atomic structures | Hydrogen and helium |
| Def: Isotope | Normal # of proton and different # of neutrons |
| ____ isotopes form lead | Radioactive uranium isotopes |
| Nucleus of a atom is made up of: | protons and neutrons |
| atoms can have up to how many shells? | 7 |
| electrons on outer shells create ___ energy and inner shells create ___ energy | *More *less |
| 2 or more atoms become a: | molecule |
| Def: Inert atom | are full with 8 electrons on outer shell |
| Def: Reactive atom | is partially full and will react/bond to other atoms |
| all atoms except ___ have 2 or more shells | Hydrogen |
| Def: Ionic bond | Weak: Gives away electron becomes positive |
| Def: Covalent bond | Strongest: shares electrons |
| What types of bond are there? | Ionic, covalent, hydrogen |
| Def: Ion | charged atom |
| Def: non polar | Equal sharing of electrons |
| Def: Polar | a unequal sharing of electrons one end slightly + and the other slightly - |
Created by:
brit_2112
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