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Bio 141
| Term | Definition |
|---|---|
| Differentiate between qualitative and quantitative chemical analysis | Qualitative analysis tells you what substances are present in a sample (the identity). Quantitative analysis tells you how much of a substance is present (the amount or concentration). 👉 Example: Qualitative = “This solution contains glucose.” Quanti |
| Serial dilutions | 1. Start with a known concentration (the stock solution). 2. Take a measured volume (aliquot) from it and add it to a new container with a known volume of solvent (usually water or buffer). 3. Mix, then repeat the process using the new solution as the s |
| the difference between dependent and independent variables in an experiment | Independent variable → the one you change on purpose in an experiment. Dependent variable → the one you measure to see how it responds. 👉 Example: If you test how light affects plant growth: |
| List the factors that influence the rate at which an enzyme function | Temperature – too low = slow reaction; too high = enzyme denatures. pH – each enzyme has an optimal pH; too acidic or basic reduces activity. Substrate concentration – more substrate increases rate until enzymes are saturated. Enzyme concentration – mo |
| Compound microscope parts | |
| Plant cell | |
| Animal cell | |
| Compound microscope is used for | viewing small, thin, and transparent specimens that cannot be seen clearly with the naked eye or a simple magnifying lens |
| Dissection microscope is used for | is used for viewing larger, solid, or three-dimensional specimens at low magnification |
| Base function of dissecting microscope | provides a heavy, stable support for the rest of the instrument and light source |
| Arm function of dissecting microscope | Fixed to the base, the arm provides a support for the stage and for the body tube which, in turn, supports the objective lenses |
| Stage function of dissecting microscope | The slide is placed on this flat platform for examination. The stage can be made of colored plastic or glass and can usually be remove |
| Body tube function of dissecting microscope | Lens are located inside the body tube and can be increased from 0.7X to 3X by turning the magnification knob |
| Ocular function of dissecting microscope | Sometimes called the eyepiece, it further magnifies the image produced by the objective lenses |
| Focusing adjustments function of dissecting microscope | One wheel is mounted on the arm of the microscope above the stage. The adjustment occurs most commonly by raising or lowering the body tube relative to the stage |
| Reflecting light function of dissecting microscope | This is the source of light that is positioned above the stage so that you can see details on objects that are not translucent |
| Transmitting light function of dissecting microscope | This is the source of light that is positioned below the stage so that you can see details on objects that ARE translucent. Note that if the object is not translucent, all you will see with this light source is a silhouette of the object |
| Magnification knob function of dissecting microscope | This is usually positioned on the body tube and allows you to adjust the magnification of the objects you are viewing. The actual magnification is 10 tens larger than the magnification written on the knob because the oculars also magnify the image 10 time |
| Base function of compound microscope | Provides a heavy, stable support for the rest of the instrument and light source |
| Arm function of compound microscope | Fixed to the base, the arm provides a support for the stage and for the body tube which, in turn, supports the objective lenses |
| Stage function of compound microscope | The slide is placed on this flat platform for examination |
| Substage condenser function of compound microscope | Lens that concentrates a beam of light at the stage |
| Iris diaphragm function of compound microscope | This provides the principal means by which the light intensity is changed and must be carefully adjusted for proper use. By moving the lever adjustment, the aperture can be opened and closed, thus regulating the amount of light that enters the condenser l |
| Objective lenses on revolving nosepiece function of compound microscope | Objectives are mounted on a rotating nosepiece and can be rotated into position. Your microscope is equipped with objectives of high (longer objectives) and low (shorter objectives) power, which function by magnifying the image on the slide |
| Ocular function of compound microscope | Sometimes called the eyepiece, it further magnifies the image produced by the objective lenses |
| Focusing adjustments function of compound microscope | Two wheels are mounted on the arm of the microscope just below the stage. The coarse adjustment (outer or larger wheel) is used to get the lens into approximate focus by raising or lowering the stage or body tube. The inner (or smaller) wheel is the fin |
| Light source function of compound microscope | On some scopes, the light source for the microscope is below the substage condenser. The switch is located on the base or arm of the microscope or on the power cord. On other scopes, the light source is a separate lamp. The switch is on the light source a |
Created by:
Kbeard06
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