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 and maintenance, serving as building blocks for tissues, enzymes, hormones, and antibodies.
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 always found in proteins besides 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 Biuret reagent, which contains sodium hydroxide (NaOH) and copper sulfate, was used to test for the presence of protein.
Step 5
Was heat necessary in the test that you carried out?
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Answer
No, heat was not necessary for the protein 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 colour change observed was purple or violet.
Step 8
Was there a colour change in the control?
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Answer
No, there was no colour change in the control.
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