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Explain why plants need both carbohydrates and proteins to function properly, and how these molecules are related to cellular processes.
Question 13 options:
Carbohydrates provide energy; proteins function as enzymes and structural components
Plants primarily use carbohydrates for structure and proteins for energy storage
Carbohydrates and proteins work together to create a single multi-functional molecule
Plants can substitute proteins for carbohydrates when energy demands are high
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Correct answer: Carbohydrates provide energy; proteins function as enzymes and structural components.
Explanation (brief):
- Carbohydrates (glucose, sucrose, starch, cellulose) are the plant’s main energy source and energy store. Glucose is broken down by glycolysis and respiration to make ATP, and starch stores excess sugar. Cellulose is a carbohydrate polymer that gives cell walls strength and shape.
- Proteins serve many roles: they are enzymes that catalyze virtually every metabolic reaction (photosynthesis, respiration, biosynthesis), structural elements (cytoskeleton, some wall-associated proteins), transporters and channels in membranes, and signaling/regulatory molecules.
- The two are interdependent: enzymes (proteins) control carbohydrate metabolism and other pathways, and carbohydrates provide the energy and carbon skeletons needed to synthesize proteins. Although amino acids can be broken down for energy in extreme cases, proteins cannot simply replace the central energy and structural roles of carbohydrates without harming the plant.
Why the other options are wrong:
- Plants do not primarily use carbohydrates for structure and proteins for energy storage (the opposite is nearer to truth: carbs are primary energy/store and also structural via cellulose).
- Carbohydrates and proteins do not usually form a single multi‑functional molecule to carry out all roles.
- Proteins cannot normally substitute for carbohydrates as the main energy source without impairing essential functions.
Explanation (brief):
- Carbohydrates (glucose, sucrose, starch, cellulose) are the plant’s main energy source and energy store. Glucose is broken down by glycolysis and respiration to make ATP, and starch stores excess sugar. Cellulose is a carbohydrate polymer that gives cell walls strength and shape.
- Proteins serve many roles: they are enzymes that catalyze virtually every metabolic reaction (photosynthesis, respiration, biosynthesis), structural elements (cytoskeleton, some wall-associated proteins), transporters and channels in membranes, and signaling/regulatory molecules.
- The two are interdependent: enzymes (proteins) control carbohydrate metabolism and other pathways, and carbohydrates provide the energy and carbon skeletons needed to synthesize proteins. Although amino acids can be broken down for energy in extreme cases, proteins cannot simply replace the central energy and structural roles of carbohydrates without harming the plant.
Why the other options are wrong:
- Plants do not primarily use carbohydrates for structure and proteins for energy storage (the opposite is nearer to truth: carbs are primary energy/store and also structural via cellulose).
- Carbohydrates and proteins do not usually form a single multi‑functional molecule to carry out all roles.
- Proteins cannot normally substitute for carbohydrates as the main energy source without impairing essential functions.
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