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- The net effect of photosynthesis, chemically, is reduction, leading to the formation of which products? a. Carbon dioxide and carbohydrates. b. Carbon dioxide and protein.
- A cell membrane is ______________? a. Permeable. b. Semipermeable. c. Nonpermeable. d. None of the above.
- A cell uses which of the following to accelerate chemical reactions enabling its metabolic machinery to operate? a. Centrasome. b. Lysosome. c. Golgi apparatus.
- Which of the following is not part of the metabolic sequence? a. Photosynthesis. b. Respiration. c. Hydoplasm. d. Digestion.
High School Biology. PRACTICE TEST. This practice test contains 29 questions. Directions. Read each question carefully and then answer it as well as you can. You must record . all answers in this Practice Test Booklet. For some questions, you will mark your answers by filling in the circles in your . Practice Test Booklet.
- 1MB
- 32
- Overview
- OCR 21st Century
- Qualitative Tests
- Benedict's Test
- Iodine Solution
- Biuret Test
- Sudan III
- Emulsion
This article provides information on qualitative tests for food chemicals, including Benedict's test for sugars, the iodine test for starch, the biuret test for proteins and Sudan III/emulsion tests for lipids. It also mentions safety precautions to be taken while performing these tests.
Carbohydrates, proteins and lipids are required by humans. The digestive system breaks down large molecules. Nutrients are passed to other organisms in a food web. Enzymes are biological catalysts.
There are several qualitative tests for food chemicals that can detect the presence of food chemicals but not how much is present.
Benedict's test is used to detect sugars, reducing sugars give a red-brown precipitate with Benedict's solution on heating for a few minutes. Glucose is an example of reducing sugar. Wear safety goggles as it is an irritant and avoid contact with skin and eyes when heating in boiling water bath.
Add iodine solution to the food being tested, foods containing starch will turn blue-black color; wear safety goggles as iodine solution is an irritant and avoid contact with skin and eyes also can be used under microscope to stain starch grains in plant cells .
The biuret test detects peptide bonds in proteins by adding Biuret solution A to a solution of the food being tested then trickle little Biuret B down side of tube look for purple coloration where solutions meet; wear safety goggles as biuret reagent A & B both corrosive & irritant respectively , avoid contact with skin & eyes .
The Sudan III test detects lipids ; wear safety goggles as sudan III flammable dissolved in alcohol , avoid contact with skin & eyes .
Alternative test for lipids ; wear safety goggles ethanol flammable , avoid contact with skin & eyes .
Mar 14, 2022 · This is a collection of free biology worksheets, notes, handouts, slides, study guides and quizzes. Most content targets high school, AP biology, genetics, anatomy/physiology, immunology, and biology 101 and 102 in college.
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