12. (a)
(i) What is meant by metabolism?
(ii) Give two reasons why living things need energy - Leaving Cert Biology - Question 12 - 2010
Question 12
12.
(a)
(i) What is meant by metabolism?
(ii) Give two reasons why living things need energy.
(b)
(i) Which biological process is represented by the foll... show full transcript
Worked Solution & Example Answer:12. (a)
(i) What is meant by metabolism?
(ii) Give two reasons why living things need energy - Leaving Cert Biology - Question 12 - 2010
Step 1
What is meant by metabolism?
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Answer
Metabolism is the sum of all the chemical reactions that occur within an organism. This includes both catabolic reactions, which break down molecules to release energy, and anabolic reactions, which build up molecules for growth and repair.
Step 2
Give two reasons why living things need energy.
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Answer
Living things need energy for movement, allowing them to move and interact with their environment.
Energy is required for maintaining body temperature and for the internal transport of substances within the organism.
Step 3
Which biological process is represented by the following word equation: glucose + oxygen ⇌ carbon dioxide + water + energy?
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Answer
The biological process represented by this equation is Aerobic respiration.
Step 4
Say where in the cell Stage 1 occurs and where in the cell Stage 2 occurs.
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Answer
Stage 1 of aerobic respiration occurs in the cytoplasm of the cell, while Stage 2 occurs in the mitochondria.
Step 5
Does the whole process release a large amount or a small amount of energy?
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Answer
The whole process releases a large amount of energy.
Step 6
Write a word equation to show what happens when yeast breaks down glucose in the absence of oxygen.
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Answer
The word equation is: Glucose → Ethanol + Carbon dioxide + Energy.
Step 7
Give one industrial application of this process.
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Answer
One industrial application of this process is Brewing or bread making.
Step 8
When muscles break down glucose in the absence of oxygen, one main product is produced. Name this product.
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Answer
The main product is Lactic acid.
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