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(TAMUCC) Bio Ch. 7
Ch.7- Plasma Membrane
| Question | Answer |
|---|---|
| bounds the cell and its surroundings | plasma membrane |
| is semi-permeable | plasma membrane |
| What is meant by semi-permeable? | Only certain substances can travel through membrane |
| Give one major function of the plasma membrane. | Regulates transport of materials. |
| Describe the fluid mosaic model of the plasma membrane; what is it composed of? | Phospholipid bilayer with a "mosaic" of various proteins embedded in it; proteins. |
| Why are phospholipids called amphipathic molecules? | Because they contain both hydrophobic and hydrophilic regions. |
| part of phospholipid which is hydrophilic | hydrophilic head |
| part of phospholipid which is hydrophobic | hydrophobic tail |
| Membranes rich in unsaturated fatty acids are more... | fluid-like |
| Membranes rich in saturated fatty acids are more... | viscous (resists the force causing the fluid to flow) |
| requires no energy; Ex:) simple diffusion, facilitated diffusion, osmosis | passive transport |
| requires energy; Ex:) endocytosis, exocytosis | active transport |
| process that transports materials along the concentration gradient | passive transport |
| process that transports materials against the concentration gradient | active transport |
| Passive transport processes move substances from an are of ______ concentration to an area of _______ concentration; do the processes need ATP? | high, low; No |
| the driving force in passive transport processes | equilibrium |
| the spontaneous net movement of particles from an area of high concentration to an area of low concentration | simple diffusion |
| When equilibrium is reached, do molecules stop moving? | No |
| the transport of molecules across a membrane by carrier or channel proteins | facilitated diffusion |
| Glucose enters the cell by what transport process? | osmosis |
| the two types of proteins involved in facilitated diffusion | channel and carrier proteins |
| can bring charged substances across the cell membrane | channel proteins |
| can bring only non-chared proteins across the cell membrane | carrier proteins |
| diffusion of fluid through a small permeable membrane from a solution with a low solute concentration to a solution with a higher solute concentration until there is an equal concentration of fluid on both sides of the membrane | osmosis |
| Hypotonic Solution: solution outside the cell is _________ compared to solution inside the cell. Therefore, water moves ________ the cell. | diluted; into |
| Hypotonic Solution: what happens to the plant cell? red blood cell? | turgid or normal; burst or lysed |
| Hypertonic Solution: solution outside the cell is _______________ compared to solution inside the cell. Therefore, water moves _________ the cell. | concentrated; outside |
| Hypertonic Solution: What happens to the plant cell? red blood cell? | plasmo-lyzed; shriveled |
| concentration of a protoplast of a plant cell as a result of loss of water from the cell | plasmolysis |
| Isotonic Solution: solution outside the cell has ______________ compared to solution inside the cell. Therefore, the amount of water that enters and leaves the cell is ____________. | equal amounts; equal |
| Isotonic Solution: What happens to the plant cell? red blood cell? | is flaccid but is giving off as much water as receiving; is normal and giving off as much water as receiving |
| the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy | active transport |
| cell takes in macromolecules by forming vesicles from the plasma membrane | endocytosis |
| the three types of endocytosis | phagocytosis, pinocytosis, receptor-mediated endocytosis |
| materials in vesicles expelled from a cell | exocytosis |
Created by:
lmarbach
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