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Lab Exam #1
Based On The Focus Questions
| Term | Definition |
|---|---|
| 0.1 micrometers to a few millimeters. | Size range of objects viewable with a microscope. |
| Eyepiece | The place you view objects through on a microscope. |
| Diopter focusing ring | Allows the left eyepiece to be focused. |
| Caliper | Holds the slide in place on a microscope. |
| Coarse focus | A larger microscope focus, only to be used on 4x and 10x magnification. |
| Fine focus | A smaller microscope focus which can be used on any magnification. |
| Stage controls | Moves the slide on a microscope. |
| Nosepiece | Rotates the objectives on a microscope. |
| Light source | Produces light underneath the slide of a microscope. |
| Objective | Determines the magnification of a microscope. |
| Stage | The place on which a slide goes on a microscope. |
| Condenser/iris diaphram | Changes the way light hits a subject of a microscope, altering contrast. |
| Magnification | How large an object appears. |
| Resolution | How easy it is to distinguish close objects as separate objects and identify fine detail. |
| Contrast | How different parts of an object absorb light differently. |
| 0.005 to 0.01 mm | Size of a bacillus. |
| 0.025 to 0.05 mm | Size of an amoeba. |
| 4.5 mm | Size of a 33-hour chick embryo |
| What is the relationship between total magnification and the apparent width of the pointer? | The larger the magnification is, the smaller the point appears to be. |
| Net electrical charge | Influences how a protein will move in an electric field. |
| Charged amino acids | A type of R-group which cause net charge. |
| Aspartic acid and glutamic acid | Amino acids that have a negative net charge at neutral pH. |
| Lysine and arginine | Amino acids that have a positive charge at neutral pH. |
| 3.2 | Isoelectric point of glutamic acid. |
| 9.8 | Isoelectric point of lysine. |
| 3.8 | Isoelectric point of aspartic acid. |
| 10.8 | Isoelectric point of arginine. |
| COOH | A monomer found in R-groups of molecules like glutamic and aspartic acid. Is not charged, but can acquire a negative charge easily. |
| NH2 | A monomer found in R-groups of molecules like lysine and arginine. Positively charged, though it can lose the positive charge at high pH's. |
| How proteins have different charges | Different amino acids make up the proteins. |
| How net charge changes with pH | The R-groups become protonated or deprotonated, leading to the acquisition or loss of charge respectively. |
| Isoelectric point | The environmental pH at which a protein will not migrate in an electric field. |
| Below the isoelectric point | Will net positively |
| Above the isoelectric point | Will net negatively |
| Isoelectric point of serum albumen | 4.9 |
| Isoelectric point of myoglobin | 7.2 |
| Isoelectric point of cytochrome c | 10.7 |
| Correlation between water potential and solute concentration | Negative |
| H50 | The time taken for a solution to reach 50% of its maximum transparency. |
| Correlation between H50 and membrane permeability | Negative |
| Correlation between permeability and molecular weight | Negative |
| 100 amu | Mass at which a solute has 0 permeability |
| Polar molecules | Cannot cross lipid membranes |
| Nonpolar molecules | Can cross lipid membranes |
| Correlation between lipid solubility and permeability | Positive |
Created by:
Ekulchu