Animals cannot carry out gluconeogenesis as they do not possass

Options

A. Glycolysis enzyme
B. Glycolate enzyme
C. Glyoxylate enzyme
D. Lysosome

Answer

To answer the question "Animals cannot carry out gluconeogenesis as they do not possess," we need to identify the specific enzymes or organelles that are absent in animals, which are crucial for gluconeogenesis. Let's break down the solution step by step.

### Step-by-Step Solution:

1. **Understanding Gluconeogenesis**:
- Gluconeogenesis is the metabolic process through which organisms synthesize glucose from non-carbohydrate precursors. This process is essential for maintaining blood glucose levels, especially during fasting.

2. **Identifying Key Enzymes**:
- Gluconeogenesis requires specific enzymes that facilitate the conversion of substrates into glucose. Some of these enzymes include:
- Pyruvate carboxylase
- Phosphoenolpyruvate carboxykinase (PEPCK)
- Fructose-1,6-bisphosphatase
- Glucose-6-phosphatase

3. **Analyzing the Options**:
- The question provides several options regarding enzymes and organelles. We need to determine which of these are not present in animals.
- **Glycolysis Enzymes**: These enzymes (like hexokinase, phosphofructokinase, and pyruvate kinase) are present in animals, so this option is incorrect.
- **Glycolate Enzymes**: These enzymes are also found in animals and are involved in amino acid synthesis, so this option is incorrect.
- **Glyoxylate Enzymes**: These enzymes are involved in the conversion of acetyl-CoA into succinate and are primarily found in plants and some microorganisms. Animals do not possess these enzymes, making this option correct.
- **Lysosomes**: These organelles are present in animal cells and are involved in digestion and waste excretion, so this option is incorrect.

4. **Conclusion**:
- Based on the analysis, the correct answer is that animals cannot carry out gluconeogenesis because they do not possess glyoxylate enzymes.

### Final Answer:
Animals cannot carry out gluconeogenesis as they do not possess **glyoxylate enzymes**.