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Biology-Glucose, Starch, Lipids and Protein Tests

rename
extensioneverything's version from 2017-03-18 23:35

Summary

This page helps you learn Glucose, Starch, Lipids and Protein Tests

Test For Glucose

Question Answer
Stage 1Place 4 ml of sample into a test tube
Stage 2Then add 4ml of Benedict’s Solution (contains alkaline copper sulphate).
memorize

 

Question Answer
Stage 3Heat the test tube over a Bunsen Burner
Stage 4The clear blue solution will change colour gradually forming a cloudy orange or ‘brick red’ precipitate of copper (I) oxide.
memorize

Test For Starch

Question Answer
Stage 1Place sample a in a test tube
Stage 2Then add 5 of drops of dilute iodine solution.
Stage 3The iodine reacts with the starch which forms a dark purple colour.
memorize

Test For Lipids

Question Answer
Stage 1Place a drop of sample on Brown paper
Stage 2Lipids leave translucent spots (grease spots) on unglazed brown paper bags.
memorize

Test For Proteins (It is called the ‘biuret test’.)

Question Answer
Stage 1Place 4 ml of sample in a test tube
Stage 2Add 5 ml of sodium hydroxide and 5 drops of copper sulphate (this is called the Biuret solution)
Stage 3If the solution becomes light purple, there is protein present
memorize

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