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Biology Test #2
i hate biology lololol
| Question | Answer |
|---|---|
| what happens to the cell in hypertonic, hypotonic or isotonic solutions? | |
| Structure of the plasma membrane | - Has 2 layers of phospholipids - layers have head like water, are hydrophilic and tails that are hydrophobic - proteins are used for transporting + sending signals to other cells - cholesterol helps keeps the cell flexible - carbs help recognize |
| where does protein synthesis and steroid hormone synthesis take place | Protein : Occurs in ribosomes; located in cytoplasm and rough ER Steroid hormone synthesis : Takes place in the smooth ER |
| 1st and 2nd laws on thermodynamics? | - 1st : Energy can neither be created nor destroyed. - 2nd : Energy CAN NOT be converted from one form to another without the loss of usable energy. |
| How do you identify an enzyme in a reaction | - typically end in 'ase' - they are not consumed in a reaction - increase the rate of reaction - only work on specific substances |
| what is a catalyst and what does it do? | A substance that speeds up chemical reactions. - gives an alternate reaction path with lower activity energy. |
| do reactants or products have more energy in endergonic or exergonic reactions | ender - products have more energy exer - release energy; products have less energy |
| prokaryotic cell | Simpler and smaller doesnt have a nucleus membrane bound organelles |
| eukaryotic cells | - more complex - has a nucleus and free organelles |
| what is a gap junction? | allows communication between cells. - forms channels that allow ions, molecules and electrical signals through. |
| tight junction? | - creates seal in the cell membrane, prevents leakage of substances across the cell membrane. |
| anchoring junction? | - Provides strength and stability to the cell - helps let the cells connect to each other to help stand stress and maintain shape. |
| functions of the plasma membrane? | -Protection : acts as a barrier Transport: controls movement Communication: Support: |
| structural and functional differences between rough and smooth er | 1. ribosomes attached - involved in protein synthesis 2. Lacks ribosomes - involved in lipid synthesis, detoxification and calcium storage |
| what structures make up the cytoskeleton? What are their functions? | - (Micro)tubulates: keeps cells shape and helps it move - Intermediate: gives the cell strength and support -Acitn filaments: Helps the cell move and maintain its shape. |
| Parts of the cell theory | - all living organisms are composed of cells - Cell is the basic unit of the structures - All cells come from pre existing cells |
Created by:
ihateschool_0606
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