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11 Cards in this Set
- Front
- Back
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What is the function of the Smooth and Rough endoplasmic reticulum?
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Smooth- Synthesises and processes lipids
Rough- Folds and processes proteins that have been made at the ribosomes. |
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What is the function of the golgi apparatus?
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Processes and packages new lipids and proteins and transports them around the cell using vesicles.
It also makes lysosomes. |
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What is the equation to calculate magnification?
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Magnification= Length of image/ Length of specimen.
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Name 1 advantage of a TEM and 1 advantage of an SEM.
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TEM- Higher Resolution than an SEM
SEM- Can be used on thick specimens and produces 3D images. |
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Name the three stages of cell fractionation and explain what happens at each step.
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1. Homogenisation- Cells are grinded to break their cell membrane and release the organelles.
2. Filteration- The solution is filtered to separate the organelles from large debris. 3. Ultracentrifugation- The solution is spun in a centrifuge. This causes a pellet to be made of the heaviest organelle. You can spin the supernatant again until you separate the organelle required. |
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Why is the plasma membrane known as Fluid- Mosaic?
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It is known as Fluid because the phopholipid bi layer is flexible and is constantly moving. The protein molecules scattered through the layer is what makes it Mosaic.
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What is the difference between an unsaturated fatty acid and a saturated fatty acid?
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Unsaturated fatty acid has a Carbon double bond, this causes the chain to kink.
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What bond forms in a triglyceride?
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Ester Bond.
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Describe the emulsion test for lipids.
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1. Shake the substance with ethanol then pour the solution into water.
2. Any lipid will show up as a milky/ cloudy emulsion. |
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The net movement of particle from an area of high concentration to an area of low concentration
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Diffusion
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what does facilitated diffusion mean?
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Uses carrier or channel proteins to move large or polar molecules across the membrane
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