5115513
Description
Flashcards by Bee Brittain, updated more than 1 year ago
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Created by Bee Brittain
over 8 years ago
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| Question | Answer |
| Prokaryotic Cells (8 things) | - Smaller than Eukaryotic - Not associated with proteins - No nucleus - Circular DNA - No Membrane bound organelles - Cell Wall made of Murein - Have mucilaginous slime - 70S ribosomes |
| Eukaryotic Cells (8 things) | - Bigger than Prokaryotic - Linear DNA - DNA associated with proteins (histones) - Membrane bound organelles - Nucleus with nuclear membrane - Cellulose (plant) or chitin (fungi) cell wall - No slime capsule - 80S ribosomes |
| What is the structure and function of a bacterial cell wall? | A bacterial cell wall is made of murein which is a polymer of polysaccharides and peptides, it is a physical barrier and provides protection. |
| What is the slime called in a bacterium slime capsule, what is its purpose? | The slime capsule is made of mucilaginous slime and is for further protection against other cells, plus it allows several bacterium to stick together, again providing more protection. |
| What are free floating in the cytoplasm of a bacterium? | 70S ribosomes |
| The genetic material in a bacterium is in the form of a circular strand of DNA and it also has smaller pieces of DNA called plasmids. What is the function of plasmids? | They can reproduce independently and may give the bacterium resistance to harmful chemicals such as antibiotics. |
| Viruses | - a-cellular, non-living particles - 20-300nm - Nucleic acids enclosed in a protein coat called the capsid - Contains RNA and DNA (the nucleic acids) but can only multiply inside host cells - Some (such as HIV) surrounded by a lipid envelope and have proteins which allow the virus to identify and attach to host cells |
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