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13 Cards in this Set
- Front
- Back
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What are the four prevailing theories in Biology? |
1. The Theory of Evolution
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What is a difference between a compound and dissecting microscope? |
Compound: Use transmitted light, high magnification - lower resolution, 2D
Dissecting: Use transmitted and reflected light, lower magnification - greater resolution, 3D |
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Adhesion vs Cohesion |
Water - Water = Cohesion Water - Other Molecules = Adhesion |
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Describe the pH Scale. |
[H+] increases as pH decreases (100 - 10-14) ↑ [OH-] increases as pH increases (10-14 - 100) ↓
- Ex: A pH of 6: [H+] = 10-6 [OH-] = 10-8 - Ex: A pH of 7: [H+] = 10-7 [OH-] = 10-7 - Ex: A pH of 8: [H+] = 10-8 [OH-] = 10-6 |
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Describe the behavior of red blood cells in hypertonic, isotonic, and hypotonic solutions. |
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In what type of concentrated solution are these elodea cells? |
Isotonic solution |
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In what type of concentrated solution are these elodea cells? |
Hypotonic solution |
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In what type of concentrated solution are these elodea cells? |
Hypertonic solution |
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What does Benedict's Test test for? |
* Positive test results red-orange/green color, A positive test result is any color change.
Reducing sugars contain free aldehyde/ketone which reduce (give electrons) Copper sulfate in Benedict’s reagent and form an orange-red colored precipitate. |
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What does Lugo's Test test for? And what yields a positive result? |
The presence of starch and a positive test results in a blue-black solution.
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What does the Sudan IV Test test for? |
Sudan IV is a nonpolar dye that tests for the presence of Lipids. Lipids will dissolve in Sudan IV and be stained red. |
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What does the Biuret Test for? |
Tests for the presence of proteins by reacting with peptide bonds. A positive test is a purple color. (Any other color change is a negative result) |
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What does the Ninhydrin Test test for? |
Tests for the presence of free amino acids by reacting with their amino groups. A positive test is either a purple/violet color OR a yellow color. |
