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The first phase in the breakdown of gluc...

The first phase in the breakdown of glucose in animal cell is

A

Krebs' cycle

B

glycolysis

C

oxidative phosphorylation

D

ETC

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Identify the Process of Glucose Breakdown**: The breakdown of glucose in animal cells is a crucial metabolic process that occurs in several stages. 2. **Determine the First Phase**: The first phase in the breakdown of glucose is known as glycolysis. This is the initial step where glucose is converted into pyruvate. 3. **Understand the Meaning of Glycolysis**: The term "glycolysis" comes from two Greek words: "glyco" meaning glucose and "lysis" meaning breakdown. Therefore, glycolysis literally means the breakdown of glucose. 4. **Recognize the Characteristics of Glycolysis**: - It is an anaerobic process, meaning it does not require oxygen. - Glycolysis is common to both aerobic and anaerobic respiration pathways. - It involves a series of ten enzymatic reactions. 5. **Products of Glycolysis**: The end products of glycolysis are two molecules of pyruvate (or pyruvic acid) and a net gain of 2 ATP molecules (though 4 ATP are produced, 2 are consumed in the process). 6. **Phases of Glycolysis**: Glycolysis consists of two main phases: - **Preparatory Phase**: The first three steps where energy is consumed (ATP is used). - **Payoff Phase**: The subsequent steps where energy is produced (ATP is generated). 7. **Conclusion**: Since glycolysis is the first step in the breakdown of glucose in animal cells, the correct answer to the question is glycolysis. **Final Answer**: The first phase in the breakdown of glucose in an animal cell is glycolysis. ---
**Step-by-Step Solution:** 1. **Identify the Process of Glucose Breakdown**: The breakdown of glucose in animal cells is a crucial metabolic process that occurs in several stages. 2. **Determine the First Phase**: The first phase in the breakdown of glucose is known as glycolysis. This is the initial step where glucose is converted into pyruvate. 3. **Understand the Meaning of Glycolysis**: The term "glycolysis" comes from two Greek words: "glyco" meaning glucose and "lysis" meaning breakdown. Therefore, glycolysis literally means the breakdown of glucose. ...
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