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Inside the Cell
Cellular parts and functions
| Question | Answer |
|---|---|
| Prokaryotic Cell | Small size No Nucleus (Nucleoid Region) No membrane-bound organelles or cytoskeleton circular chromosomes and naked chromosomes= Plasmids |
| Eukaryotic Cell | Larger cell Nucleus Linear chromosomes Histones- organizes DNA Complex organelles and Cytoskeleton |
| Nucleus | two membranes- nuclear envelope(continuous)/Nuclear lamina(protein fibers) nucleolus (ribosomal RNA synthesis) euchromatin and Heterochromatin |
| Ribosomes | protein synthesis large and small subunit no membrane |
| Free Ribosomes | in cytosol synthesize proteins for nucleus and cytosol |
| Membrane-bound Ribosomes | Attached to rough ER synthesize proteins to be secreted, embedded in membrane, or packaged by lysosomes. |
| Endoplasmic Recticulum | Network of membrane-bound sacs and tubules |
| Rough ER | Flattened sacs continuous with nuclear envelope studded with ribosomes protein synthesis and processing |
| Protein synthesis and processing (Rough ER) | Signal enters through lumen of ER due to sequence on protein and attaches to a SRP in membrane. |
| Smooth ER | Network of tubules cont. with Rough ER No ribosomes functions for detoxification, lipid synthesis and calcium storage (muscle cells) |
| Golgi Apparatus | stack of flattened sacs (cisternae)/ Functions to sort, package, and disperse proteins Receives proteins on cis face infuse on membrane and Releases proteins trans face to lysosomes/ sorts proteins by polysaccharide tags (ligand) |
| Lysosomes | membrane-bound vesicles/ inactive enzymes activated by acidic pH (acid hydolases)/function is the digestion of phagocytize particles and autophagy (storage for plant cells) |
| endomembrane system | rough endoplasmic recticulum, lysosomes, and golgi apparatus |
| Peroxisomes | membrane- bound vesicles/ site of oxidative reactions (removal of electrons)/produces H_2_O_2, contains catalase (breaks the toxic into oxygen and water) |
| Mitochondria | possesses circular DNA and ribosomes/ produces most of the cell's ATP from fuel in food/ structure 2 membranes, cristae, and matrix |
| Chlorrplasts | possess circular DNA and ribosomes/ structure is 2 membranes, thylakoid, stroma/ site of photosynthesis |
| Cytoskeleton | protein fibers and tubules in cytosol/ actin-intermediate filaments-microtubules |
| actin filaments | aka microfilaments/ two interwound chains of protein subunits/ provide resistance in stretching forces and interacts with myosin(motor protein) to produce movement |
| Movement of Actin | Ameboid- pushes forward/ cytokinesis in animals pinch membrane in two/cytoplasmic streaming actin-myosin move cytoplasm around cell |
| Intermediate filaments | play a structural role/ many types >70 genes/ in cytoplasm anchor the organelles/ neurofilaments in nerve cells/ connect adjacent cells/ |
| N | provides support in nucleus to anchor chromosomes |
| Microtubules | formed by tubulin polymerization (+) and depolymerization (-)/ function is to maintain cell shape and serve as track for motor proteins |
| Centrosome | is part of microtubule that allows it to elongate and shrink-regulates growth/ contains 9 microtubule triplets |
| Tracks Microtubules serve as | 1.chromosomes in dividing cell/ kinetrochore (moves so chromosomes go to the left/ 2. Vesicles within the cell/ kinesin motor protein ( guide mov't of vesicles)/ 3. Whole cell: cilia and flagella/ dynein motor protein(hydrolize ATP-bend mov't) |
| exocytosis | secretion of materials from inside the cell |