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Inside the Cell
| Question | Answer |
|---|---|
| All cells have these three things, what are they? | Cytoplasm, genetic material, ribosomes. |
| Bacteria are beneficial in what cases? | They decompose dead remains, can be used to manufacture chemicals for our use, can be an important factor in our foods. |
| Eukaryotic Cells | Have a membrane bound nucleus, Larger that Prokaryotes, with lower surface area to volume Have organelles. |
| The plasma membrane does what two things for a cell? | 1-isolates the interior from the exterior 2-is selectively permeable |
| Channel Proteins | Are simple protein pores that allow subtances to cross |
| Transport Proteins | Combine with substances to assist in their movement across |
| Cell Recognition Proteins | Are glycoproteins that recognise pathogens |
| Receptor Proteins | Have a shape that only binds with a specific signal molecule |
| Enzymatic Proteins | Membrane proteins that carry out chemical reactions |
| Junction Proteins | Connect cells to each other to allow them to communicate. |
| Bacteria have what three componants of a cell? | Cell wall, Plasma membrane, Ribosomes. |
| Animal cells lack 2 componants of cells, and 'often' lack a third. What are they? | Cell wall, Chloroplasts, and often Cilia or Flagella |
| Plant cells are missing what two componants of a cell? | Lysosomes, Centrioles |
| Plant cells sometimes have this: | Cilia or flagella |
| DNA + Protein + RNA = ? | Chromatin |
| mRNA does what? | Carries DNA information |
| rRNA does what? | combines with specific protiens to build subunits of ribosomes. |
| What four things compose the endomembrane system? | 1-the nuclear membrane 2-the endoplasmic reticulum (with the rER and sER) 3-The Golgi Apparatus 4-Membranous sacs called vesicles |
| What does the golgi apparatus make? | Lysosomes. |
| This product also participates in programmed death or _____: | Lysosomes, APOPTOSIS |
| Three componants of cytoskeleton include: | Actin Filaments, Intermediate Filaments, Microtubules. |
| These consist of two chains of globular actin monomers intertwined in a helix | Actin Filaments |
| These support the cell and often the projections like microvilli | Actin Finaments |
| These are intermediate in size between actin filaments and microtubules. | Intermediate Filaments |
| Are fibrous, ropelike, polypeptides that support the nucleus and the plasma membrane | Intermediate Filaments |
| Are proteins arranged to form cylinders, arranged by the centrosome. | Microtubules |
| Centrioles are involved in...? | Cell division |
| Centrioles are located... | in the Centrosome |
| A microtubule organizing center near the nucleus of the cell, this controls microtubule assembly. What is it? | Centrosome. |
| Two Tubulin monomers make? | A tubulin dimer. |
| These are composed of 13 link chains of tubulindimers, and they radiate from the centrosome. They maintain the shape of the cell, and act as tracks for organelle to move along. | Microtubules. |
| Plant cell walls occasionally have two components, connected by plasmodesmata. What are they? | The primary cell wall and the secondary cell wall. |
| Animal cells don't have a cell wall, but they have two other exterior structures of interest. What are they? | An extracellular matrix, and various junctions occuring between some cell types. |
| Three type of junctions are found between cells. What are they? | Adhesion junctions, tight junctions, and gap junctions. |
| In adhesion junctions: | Internal cytoplasmic plaques which are firmly attached to the cytoskeleton of each cell, are joined by intercellular filaments. The result is a sturdy but flexible sheet of cells. In some organs,where tissues must stretch. |
| Tight junctions: | Adjacent cells, membrane proteins attatch to each other, making a zipper-like attatchment. |
| Gap junctions: | Allow cells to communicate. A gap junction is formed when two identical plasma membrane channels join. The channel opens and closes, giving support, but allowing ions to go between them. *muscle cells contract this way. |