Metabolism: All the chemical reactions in a body or in a cell
1 - Leaving Cert Biology - Question a - 2017
Question a
Metabolism: All the chemical reactions in a body or in a cell
1. Photosynthesis: Anabolism
2. Respiration: Catabolism
(iii) Why organisms need energy: e.g. Moveme... show full transcript
Worked Solution & Example Answer:Metabolism: All the chemical reactions in a body or in a cell
1 - Leaving Cert Biology - Question a - 2017
Step 1
What is metabolism?
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Answer
Metabolism refers to all the chemical reactions that occur within a body or a cell. It encompasses both the processes that build up molecules (anabolism) and those that break them down (catabolism).
Step 2
Photosynthesis: Define
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Answer
Photosynthesis is an anabolic process whereby plants convert light energy into chemical energy, synthesizing glucose from carbon dioxide and water.
Step 3
Respiration: Define
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Answer
Respiration is a catabolic process in which cells convert glucose and oxygen into energy, releasing carbon dioxide and water as byproducts.
Step 4
Why do organisms need energy?
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Answer
Organisms require energy for various vital functions such as movement, maintaining body temperature (heat), and growth. Energy is essential for metabolic processes that support life.
Step 5
Where stage 1 respiration occurs
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Stage 1 of respiration occurs in the cytoplasm, where glucose is partially broken down through glycolysis.
Step 6
Where stage 2 respiration occurs
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Stage 2 of respiration happens in the mitochondria, where the products of glycolysis are further broken down in the Krebs cycle and oxidative phosphorylation to produce ATP.
Step 7
Which type respiration gives acid?
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Anaerobic respiration results in the production of acid, as it occurs in the absence of oxygen.
Step 8
Which acid is produced?
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In anaerobic respiration, particularly in muscle cells, lactic acid is produced.
Step 9
Fate of acid
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Lactic acid can be broken down into glucose through the liver in a process called gluconeogenesis, or it can be converted back to pyruvate when oxygen becomes available.
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