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A&P
Biology of the Cell pt 2
| Question | Answer |
|---|---|
| Sodium diffusion into cells occurs_____ the loss of K+ | simultaneously to |
| The Na+K+ exchange pump is a special type of ion pump called an _____ pump because it moves one type of ion into a cell ____ its concentration gradient and another type of ion out of the cell _____ its concentration gradient | exchange, against, against |
| When a cell is dividing, the DNA is tightly coiled as | chromosomes |
| The organelle that has a double membrane, its own small piece of DNA, and synthesizes ATP is the | mitochondrion |
| K+ movement out of the cell is facilitated by its _____ gradient but opposed by the ____ gradient | chemical concentration, electrical |
| Sodium ions move into the cell through ___ -mediated diffusion | channel |
| Gap junctions are bridged by proteins called | connexons |
| The cytosol close to the plasma membrane contains relatively more ____ ions than does the interstitial fluid that is close to the plasma membrane | K+ |
| The cell membrane contains/consists of | phospholipid bilayer, several different types of lipids, cholesterol |
| A transmission electron microscope (TEM) uses an ____ to create an image for viewing | electron beam |
| Contains receptors that recognize and respond to molecular signals | communication |
| Establishes and maintains an electrical charge difference across the plasma membrane | Electrochemical gradients |
| Phospholipid bilayer separates substances inside and outside the cell | Physical barrier |
| Regulates entry and exit of ions, nutrients, and waste molecules through the membrane | Selective permeability |
| The plasma membrane is made up of three types of lipids: cholesterol, phospholipids, and ____ | glycolipids |
| Na+ and K+ are moved in _____ directions to maintain the resting membrane potential | opposite |
| When a protein is marked for destruction by having a protein called ubiquitin bound to it, the organelle responsible for this removal are | proteasomes |
| Interconnected network of membrane tubules and vesicles; no ribosomes attached | Smooth ER |
| Double membrane structure with cristae | Mitochondria |
| Stacked series of flattened, smooth membrane sacs with associated transport vesicles | Golgi apparatus |
| Flattened intracellular network of membrane sacs called cisternae; ribosomes attached on cytoplasmic surface | Rough ER |
| Its processes are the reverse of prophase It is the last phase of mitosis Directly follows anaphase | Telophase |
| Neurons have a resting membrane potential of ___ mv | -70 |
| A type of steroid called _____ is scattered within the hydrophobic regions of the phospolipid bilayer, where it strengthens the membrane and stabilizes it at extreme temperature | cholesterol |
| The ______ gradient is dependent on the combination of the ____ gradient and the chemical concentration gradient | electrochemical, electrical |
| Much of the internal content of the ____ is the genetic material, DNA | nucleus |
| The three components of the cytoplasm of a cell are | cytosol, inclusions, and organelles |
| The ______ is a general term for all cellular contents between the plasma membrane and the nucleus | cytoplasm |
| Adenine pairs with | thymine |
| Guanine pairs with | cytosine |
| Thymine pairs with | adenine |
| Cytosine pairs with | guanine |
| They can "float" and move about the phospholipid bilayer They may serve as enzymes They are attached loosely to the cell membrane | Peripheral proteins |
| Cytosol is also called | intracellular fluid |
| Cytosol is high in | water content |
| Cytosol contains many ____ solutes | dissolved |
| Cytosol contains proteins and | carbohydrates |
| The amount of rough ER is greater in cells that produce a large amount of proteins for | secretion |
| ____ are attached to rough ER | Ribosomes |
Created by:
lindseylew