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Science Cells
Cells
| Question | Answer |
|---|---|
| What is the order of organization of systems? | Cell--tissue--organ--organ system--organism |
| Organism | Anything that can live on its own |
| Cell | membrane covered structure that contains all the materials necessary for life |
| Tissue | a group of cells working together to perform a specific job |
| Organ | two or more tissues working together to perform a specific job |
| Organ system | group of organs working together (i.e- digestive, respiratory) |
| Robert Hooke | Saw first cells in cork |
| Anton Van Leewenhoek | first observed living cells in pond water |
| Cell theory | a) all organisms are composed of one or more cells b) cell is the basic unit of life in all living things c) all cells come from other cells |
| Why can't cells be the size of a basketball? (Include volume/surface area in your answer) | Cells are small because the surface is not large enough to bring in enough nutrients or get rid of enough waste to keep cell alive -Inside (volume) grows faster than the outside (surface area) -Big or small organisms have the same size of cells |
| What are the 2 type of cells? | Eukaryote & Prokaryote |
| Prokaryote | No nucleus to contain DNA; it floats around (i.e- bacteria) |
| Eukaryote | Has nucleus which contains DNA (i.e- animal cells) |
| Organelles | little organs of function |
| Cytoplasm | jellylike material that surrounds organelles |
| What does the cell membrane do? | allows nutrients and waste to move into and out of cell -made of phospholipids that do not like water so they force the water to go through gated channels -all cells have cell membrane |
| Nucleus | largest organelle; stores DNA |
| Nucleolus | in nucleus; stores material used to make ribosomes |
| Ribosomes | smallest and most abundant organelle -amino acids hook together to make proteins |
| Ednoplasmic Reticulum | sacks and tunnels of membranes that carry substances to outside of cell -Found a lot in cells that make proteins, lipids, and enzymes -Break down chemicals that harm cells |
| Types of endoplasmic reticulum | Rough- covered with ribosomes; transport proteins Smooth- is not covered with ribosomes |
| Golgi bodies | flattened stacked membranes -changes lipids and proteins, pinches them off into sacks (vesicles) and ships them out of the cell -helps create lusosomes |
| Vesicle | membrane bound structure that carries substances from golgi bodies |
| Lysosomes | contain digestive enzymes -breakdown old cells and bacteria -"garbage trucks" of the cell |
| What cells have a lot of lysosomes and why? | White blood cells b/c they attack bacteria, etc. |
| Mitochondria | energy is released in this organelle from glucose being broken down -active organs like muscles have more mitochondria |
| Cristae (mitochondria has it) | inner folds that increase the surface area so more glucose can be broken down and more energy (ATP) released |
| Plant cells have some organelles that ___________ don't have | animal cells |
| Plant cells: cell wall | made of cellulose -tough and rigid |
| Chloroplasts | contain cholorophyll- green pigment; absorb sunlight where photosynthesis occurs and glucose (sugar) is made |
| Vacuoles | Sack that contains water, waste material, food -Makes up most of cells volume |
| What are the two basic shapes of cells and what cells are they? | Square- plant cells usually round- animal cells |
| Microscope | -magnifies objects |
| Magnification | how much larger a specimen is when using a microscope |
| List the 3 types of microscopes in order from least magnified to most magnified | Light microscope, Scanning Electron Microscope, and Transmission Election Microscope |
| Light microscope | the models found in most schools, uses compound lenses and light to magnify objects. -The lenses bend or refract the light, which makes the object beneath them appear closer |
| Scanning Electron Microscope | -SEMs do not use light waves; they use electrons (negatively charged electrical particles) to look at surface of object -Magnify objects up to 500,000X -If you want to look at the surface you may have to cover the surface by a very thin layer of gold |
| Transmission Electron Microscope | aims beam of light through thin slices of specimen -Thicker pieces appear darker -Magnifies up to 1,000,000X |
| cell membrane- gated channels | protein molecules that create openings to allow H2O or sugar, etc. to enter and leave the cell |
Created by:
spuent
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