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proficiency quiz 2
biology
| Term | Definition |
|---|---|
| cell theory | 1. all organisms are made of 1 or more cells 2. cells are the building blocks of life 3. all cells come from existing cells |
| do hydrophobic substances have even or uneven sharing of elections? | even, meaning they are nonpolar |
| What 3 things do all prokaryotic and eukaryotic cells have in common? | 1. plasma membrane 2. chromosomes 3. ribosomes |
| do hydrophilic substances have even or uneven sharing of electrons? | uneven meaning they are polar |
| what is the plasma membrane? | the plasma membrane forms a boundary between the cell and it's surroundings |
| what is the general function of the phospholipid bilayer? | It controls the molecules that enter and leave the cell |
| describe the head of a phospholipid | hydrophilic meaning they are polar,the heads are negatively charged because of the phosphate groups |
| describe the tails of a phospholipid | hydrophobic meaning they are nonpolar. They are also fatty acids |
| nonpolar | even sharing of electrons, creating no charge. A neutral molecule. |
| polar | uneven sharing of electrons creating a partial charge |
| what is the main difference between prokaryotes and eukaryotes? | Eukaryotes have a nucleus and prokaryotes do not. |
| how does the significance of the chemical properties of the heads and tails have relations to how the structure of the bilayer functions? | non polar molecules can get through the bilayer, because they do not have a charge.small polar molecules can also get through the bilayer because of their size, But any large polar molecule has to go through a channel protein. |
| What is one specific job the phospholipid bilayer does? | allowing certain molecules to pass through the bilayer. nonpolar and small polar molecules can pass through the the hydrophobic interior. Other large polar molecules can't pass through the interior but they can travel through the integral proteins |
| what is another specific job the phospholipid bilayer does? | the carbohydrates on the bilayer (chains of sugar) are used as identification that tells the cells which cells need to go where and identifies foreign cells that need to leave. |
Created by:
cosettegiroux
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