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Which of the following statements is not...

Which of the following statements is not true for metabolically active cells ?

A

They are usually smaller in size

B

Have higher nucleocytoplasmic ratio

C

Have lower surface - volume ratio

D

Have ability to exchange oxygen and waste materials with environment

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statement is not true for metabolically active cells, let's analyze each option step by step. ### Step-by-Step Solution: 1. **Understanding Metabolically Active Cells**: - Metabolically active cells are those that are engaged in various biochemical processes, including energy production, synthesis of molecules, and waste removal. 2. **Analyzing Statement 1**: - **Statement**: "They are usually smaller in size." - **Analysis**: This statement is true. Metabolically active cells tend to be smaller because a smaller size allows for more efficient nutrient uptake and waste removal. 3. **Analyzing Statement 2**: - **Statement**: "They have a higher nucleocytoplasmic ratio." - **Analysis**: This statement is also true. A higher nucleocytoplasmic ratio means that there is more nucleus relative to the cytoplasm, which is typical in cells that are actively synthesizing proteins and other molecules. 4. **Analyzing Statement 3**: - **Statement**: "They have a lower surface volume ratio." - **Analysis**: This statement is false. Metabolically active cells generally have a higher surface area to volume ratio, which facilitates better exchange of materials (nutrients and waste) with the environment. A lower surface volume ratio would hinder this exchange. 5. **Analyzing Statement 4**: - **Statement**: "They have the ability to exchange oxygen and waste materials with the environment." - **Analysis**: This statement is true. Metabolically active cells must exchange gases and waste materials with their environment to maintain metabolic processes. ### Conclusion: The statement that is **not true** for metabolically active cells is **Statement 3**: "They have a lower surface volume ratio."
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