8. (a) (i) Name a food source that is rich in protein - Leaving Cert Biology - Question 8 - 2019
Question 8
8.
(a) (i) Name a food source that is rich in protein.
(ii) Give a reason why the body needs protein in the diet.
(b) Answer the following questions about food te... show full transcript
Worked Solution & Example Answer:8. (a) (i) Name a food source that is rich in protein - Leaving Cert Biology - Question 8 - 2019
Step 1
(a) (i) Name a food source that is rich in protein.
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Answer
A food source that is rich in protein is meat. Other valid answers include eggs, fish, and beans.
Step 2
(a) (ii) Give a reason why the body needs protein in the diet.
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Answer
The body needs protein for growth and repair of tissues. Proteins are essential for building muscles, enzymes, and hormones.
Step 3
(b) (i) What reagent did you use to test for protein?
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Answer
The reagent used to test for protein is Biuret solution, which contains sodium hydroxide and copper sulfate.
Step 4
(b) (ii) What colour was this reagent before you added it to the food sample?
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Answer
Before adding it to the food sample, the Biuret reagent is blue.
Step 5
(b) (iii) What was the final colour of this reagent if protein was present?
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Answer
If protein is present, the final colour of the reagent turns purple or mauve.
Step 6
(b) (iv) Name a piece of apparatus required to carry out this test in a laboratory.
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Answer
A piece of apparatus required for this test is a dropper or a test tube.
Step 7
(b) (v) Describe a safety precaution that should be taken during the investigation.
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Answer
A valid safety precaution is to wear safety glasses to protect the eyes from any splashes. Additionally, using gloves and a laboratory coat is advisable.
Step 8
(b) (vi) What test solution did you use?
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Answer
The test solution used to identify reducing sugars is Benedict's solution (or Fehling's solution).
Step 9
(b) (vii) What colour was this solution before you added it to the food sample?
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Answer
Before adding it to the food sample, the solution is blue.
Step 10
(b) (viii) What was the final colour of this solution if reducing sugar was present?
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Answer
If reducing sugar is present, the final colour of the solution will change to red or allow brown.
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