The Question is from neet-botany , and it was created by the author NISHANTH

Question

Which of the following statements are correct?
I. Acetic acid can form cholesterol
II. Flow of metabolites through metabolic pathway has a definite rate and direction. It is called dynamic state of body constituents
III. Anabolic pathway is endergonic while catabolic pathway is exergonic
IV. All biomolecules have a term over, i.e., they are constantly being changed into some other biomolecules and also made from other biomolecules
The correct options is

NISHANTH · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
**Primary Concept**: Metabolic Pathways and Biomolecule Turnover
**Related Topics**: Anabolism, Catabolism, Cholesterol synthesis, Dynamic state of body constituents
**Prerequisites**: Basic understanding of metabolic pathways, types of metabolic reactions, and biomolecules.
## SOLUTION PATHWAY
**Given Information**:
    Four statements regarding biochemical processes.
**Method & Steps**:
1. **Analyze Statement I:** Acetic acid (acetyl-CoA) is a precursor for cholesterol synthesis. This is a known biochemical pathway.
    Reasoning: Cholesterol is synthesized from acetyl-CoA molecules.
    Formula/Rule: N/A
2. **Analyze Statement II:** Metabolic pathways have a definite flow rate and direction, indicating a dynamic state where molecules are constantly being synthesized and degraded. This is a key principle in biochemistry.
    Reasoning: The constant turnover of molecules in the body defines its dynamic state.
    Formula/Rule: N/A
3. **Analyze Statement III:** Anabolic pathways (synthesis) require energy input (endergonic), while catabolic pathways (breakdown) release energy (exergonic).
    Reasoning: This is the fundamental difference between anabolism and catabolism.
    Formula/Rule: N/A
4. **Analyze Statement IV:** Biomolecules have a constant turnover, meaning they are continuously being synthesized and degraded.
    Reasoning: Biomolecules are not static; they are subject to constant change.
    Formula/Rule: N/A
5. **Determine correctness:** All four statements are correct based on biochemical principles.
    Result: All statements are correct.
    Verification: Reviewed each statement against established biochemical facts.
## OPTION ANALYSIS
[A] ✓: All four statements are correct, reflecting a good understanding of metabolism and biomolecule turnover.
[B] :x: Statement III and IV are also correct, so this option is incorrect.
[C] :x: Statements I, II and III are also correct, so this option is incorrect.
[D] :x: All statements are correct, so this option is incorrect.
## LEARNING AIDS
**Common Mistakes**:
1. **Misunderstanding Anabolism/Catabolism:** Confusing the energy requirements of anabolic and catabolic pathways. To avoid this, remember that anabolism builds molecules and requires energy (endergonic), while catabolism breaks down molecules and releases energy (exergonic).
2. **Static View of Biomolecules:** Thinking that biomolecules are fixed and unchanging. Remember that biomolecules are constantly being synthesized and degraded.
**Quick Tips**:
1.  **Anabolism = Building Up:** Associate 'anabolism' with 'building up' and needing energy.
2.  **Catabolism = Breaking Down:** Associate 'catabolism' with 'breaking down' and releasing energy.

NISHANTH · Answer

The correct Option is "All are correct"

NISHANTH · Answer

I and II are correct

NISHANTH · Answer

Only IV is correct

NISHANTH · Answer

All are wrong

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