Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
41 Cards in this Set
- Front
- Back
this microscope uses a combination of two lenses to magnify an image. |
Compound Micrscope |
|
this knob is used to raise the body tube slowly until the specimen comes into focus |
Course adjustment knob. |
|
This knob is used to sharpen the focus. |
fine adjustment knob |
|
Whenever a higher power objective is in place us this knob to refocus |
fine adjustment knob |
|
These microscopes always have two eyepieces |
Dissecting Microscopes |
|
When the specimen can be from above or below |
illumination |
|
This is the light source above the specimen |
reflected light |
|
This is the light source under the specimen |
transmitted light |
|
When you multiply the power of the ocular lens by the power of the objective lens |
total magnification |
|
This is the unit commonly used for measuring microscopic specimens |
micrometer |
|
At ____ magnifications the field of view covers a much smaller portion of the specimen |
higher |
|
diameter measured under low power X the power of the low magnification divided by the power of the higher magnification |
Unknown diameter under higher power |
|
This is a fast moving organism covered with beating hair-like cilia. |
Paramecium |
|
This slows down swimming organisms by "thickening" the water |
Proto-slo |
|
These are proteins that catalyze (speed up) vital biochemical reactions by reducing the "activation energy" neded to get the reaction going |
Enzymes |
|
These can be used over and over again, are extremely specific, are extremely reactive and function best within a narrow range of temp. and pH (acidity) |
Enzymes |
|
Acidity is measured in terms of a unit called |
pH |
|
This device measures how "dark" a liquid is |
Spec 20 |
|
THis shins a beam of light through the liquid test tube and measures how much of the light is absorbed as it passes through the test tube |
Spec 20 |
|
This was used to measure the rate of browning (benzoquinone formation) under different conditions |
Spec 20 |
|
Why is a blank test tube used? |
It is used because the startin solution of enzyme and substrate isn't perfectly clear and absorbs light even before the browning reaction begins |
|
Why do we set the wavelength of the spec 20 to 540 nanometers? |
It absorbs benzoquinone better. |
|
What's an example of a good source of enzyme catecholase? |
potato extract |
|
This is the vitally important by which water moves in and out of cells |
Osmosis |
|
This is the net movement of molecules from areas of high concentration to areas of low concentration |
Diffusion |
|
This is the net movement of water molecules across a semi-permeable membrane |
Osmosis |
|
This allows small molecules to pass through them, but not larger molecules like sugar and dye. |
Semi-permeable |
|
Because sucrose molecules can't get out, their presence will keep the concentrations of water molecules always lower inside the bag compared to the pure water outside the bag |
rtgrtg |
|
the passive movement (diffusion) of water across a semi-permeable membrane in response to differences in pressure and solute concentrations on either side of the membrane. |
The formal definition of osmosis |
|
This is the tendency of water to move into a cell |
Osmotic pressure |
|
This is a device designed to measure osmotic pressure by measuring the amount of internal hydrostatic pressure needed to stop the movement of water into a cell |
Osmotic pressure |
|
THis is measured by the height of the column after the fluid level has stopped rising. |
osmotic pressure |
|
The fluid stops rising when the water pressure inside the bag is increased to the point where it is equal to the osmotic pressure. |
erfrwg |
|
solute concentrations are higher in the environment than they are inside the cell |
hypertonic |
|
solute concentrations are lower outside than inside and water moves into the cell |
hypotonic environments |
|
solute concentrations are the same outside as inside so there is no net water movement |
isotonic environments |
|
this is the pressure exerted on the cell wall by the fluid contents of the cell |
turgor pressure |
|
The shrinking of the cell membrane away from the cell wall |
plasmolysis |
|
this cell is invisible because because it is pressed up against the inner surface of the cell wall. |
Turgid cell |
|
The cell membrane is visible because it has pulled back away from the cell wall |
plasmolyzed cell |
|
number of plasmolyzed cells divided by the number of cells counted times 100 |
Percentage of cells plasmolyzed |