The mitochondria inner membrane is highly folded into ______, which ______.

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BlackTom AI · Accepted Answer

First, consider what the inner mitochondrial membrane actually forms. The inner membrane is highly folded into structures that maximize the membrane surface area, which is essential for hosting many enzymes involved in the electron transport chain and ATP synthesis.
Option 1 states: 'cristae; increase surface area.' This aligns with basic cell biology: cristae are the folds of the inner membrane, and their folding increases the available surface area for mitochondrial processes.
Option 2 claims: 'mitochondrial folds; allow copies of the electron transport chain to be closer together.' While the inner membrane does have folds, the phrasing 'mitochondrial folds' is vague and does not identify the correct structure (cristae). Additionally, the purpose is not primarily about clustering ETC components closer together, but about increasing total surface area; the benefit of proximity is not the canonical explanation.
Option 3 asserts: 'cristae; decrease surface area.' This directly contradicts established knowledge; cristae increase, not decrease, the surface area available for biochemical reactions.
Option 4 mentions: 'thylakoid grana; increase surface area.' Thylakoids and grana are components of the chloroplasts, not mitochondria. Using them here would be mixing organelles, which makes this option factually incorrect.
In summary, the correct interpretation is that the inner mitochondrial membrane forms cristae, which serve to increase the membrane's surface area, supporting more enzymes and pathways for energy production.

APBIO141-031 with labs Unit 3 Test

The mitochondria inner membrane is highly folded into , which .

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