8. (a)
(i) State one reason that your body needs protein - Leaving Cert Biology - Question 8 - 2007
Question 8
8. (a)
(i) State one reason that your body needs protein.
(ii) Name the element, other than carbon, hydrogen and oxygen, which is always found in protein.
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Worked Solution & Example Answer:8. (a)
(i) State one reason that your body needs protein - Leaving Cert Biology - Question 8 - 2007
Step 1
State one reason that your body needs protein.
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Answer
Proteins are essential for growth or maintenance, repair of tissues, and the production of enzymes, antibodies, and hormones. In addition, they can provide energy when carbohydrates are not available.
Step 2
Name the element, other than carbon, hydrogen and oxygen, which is always found in protein.
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Answer
Nitrogen is the element that is always found in proteins in addition to carbon, hydrogen, and oxygen.
Step 3
Name two foods in which you found protein.
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Answer
Chicken
Lentils
Step 4
What reagent or chemicals did you use to test for protein?
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Answer
The reagent used to test for protein was Biuret solution, which contains sodium hydroxide (NaOH) and copper(II) sulfate.
Step 5
Was heat necessary in the test that you carried out?
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Answer
No, heat was not necessary for the Biuret test.
Step 6
What was the initial colour of the reagent or chemicals?
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The initial color of the Biuret reagent was blue.
Step 7
What colour change occurred if protein was present?
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If protein was present, the color changed to purple or violet.
Step 8
Was there a colour change in the control?
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No, there was no color change in the control.
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