5(4) i.e. best five answers from (a) – (f):
(a) Why living organisms require food:
Energy (source) or (cellular) respiration
(Raw materials) for growth or (raw materials) for repair or anabolism
(b) Polysaccharide:
(A carbohydrate or molecule composed of) many sugar (or named monosaccharide) units (or molecules)
(c) Main structural polysaccharide in plants:
Cellulose (allow pectin)
(d) Triglyceride molecule composition:
Glycerol and three fatty acids
(e) Structural role of lipids:
(Found in) membranes (allow insulation)
(f) Name of test or chemicals used to demonstrate the presence of protein:
Biuret or copper sulfate and sodium hydroxide - Leaving Cert Biology - Question 1 - 2018
Question 1
5(4) i.e. best five answers from (a) – (f):
(a) Why living organisms require food:
Energy (source) or (cellular) respiration
(Raw materials) for growth or (raw mate... show full transcript
Worked Solution & Example Answer:5(4) i.e. best five answers from (a) – (f):
(a) Why living organisms require food:
Energy (source) or (cellular) respiration
(Raw materials) for growth or (raw materials) for repair or anabolism
(b) Polysaccharide:
(A carbohydrate or molecule composed of) many sugar (or named monosaccharide) units (or molecules)
(c) Main structural polysaccharide in plants:
Cellulose (allow pectin)
(d) Triglyceride molecule composition:
Glycerol and three fatty acids
(e) Structural role of lipids:
(Found in) membranes (allow insulation)
(f) Name of test or chemicals used to demonstrate the presence of protein:
Biuret or copper sulfate and sodium hydroxide - Leaving Cert Biology - Question 1 - 2018
Step 1
Give the two main reasons why living organisms require food.
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Answer
To provide energy for cellular activities, such as movement and metabolic processes.
As raw materials for growth and repair of tissues.
Step 2
What is a polysaccharide?
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Answer
A polysaccharide is a complex carbohydrate that consists of long chains of monosaccharide units linked together by glycosidic bonds.
Step 3
Name the main structural polysaccharide in plants.
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Answer
The main structural polysaccharide in plants is cellulose.
Step 4
Describe the composition of a triglyceride molecule.
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Answer
A triglyceride molecule is composed of one glycerol molecule and three fatty acid molecules, forming an ester bond.
Step 5
Give a structural role of lipids in the human body.
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Answer
Lipids serve as a key component of cell membranes, providing structural integrity and fluidity.
Step 6
Name a test or give the chemicals used to demonstrate the presence of protein in a food sample.
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Answer
The presence of protein in a food sample can be demonstrated using the Biuret test, which involves adding copper sulfate and sodium hydroxide.
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