Which example best illustrates a structure-function relationship in biology?

Which example best illustrates a structure-function relationship in biology?

• A. Ribosomes are made primarily of lipids.
• B. The nucleus is devoid of DNA.
• C. Mitochondria have folded inner membranes to maximize ATP production.
• D. Ribosomes synthesize proteins in the cytoplasm.

Answer: (C)

Structure-function relationships show how a physical design enables a biological role. Mitochondria have folded inner membranes, called cristae, which dramatically increase surface area for the enzymes of cellular respiration. That extra surface area allows more electron transport chain components and ATP synthase to operate at once, boosting ATP production. This direct link between the membrane’s folded structure and the energy-making function is why this example best illustrates a structure-function relationship. The other statements miss this link: ribosomes aren’t mainly made of lipids, the nucleus does contain DNA, and while ribosomes do synthesize proteins in the cytoplasm, that describes a function without tying it to a specific structural adaptation that enhances it.

Structure-function relationships show how a physical design enables a biological role. Mitochondria have folded inner membranes, called cristae, which dramatically increase surface area for the enzymes of cellular respiration. That extra surface area allows more electron transport chain components and ATP synthase to operate at once, boosting ATP production. This direct link between the membrane’s folded structure and the energy-making function is why this example best illustrates a structure-function relationship. The other statements miss this link: ribosomes aren’t mainly made of lipids, the nucleus does contain DNA, and while ribosomes do synthesize proteins in the cytoplasm, that describes a function without tying it to a specific structural adaptation that enhances it.