If cellular respiration lacks oxygen, which consequence follows in mammalian cells?

💡 Explanation

Glycolysis requires NAD+ to proceed. Without oxygen, the electron transport chain shuts down, and fermentation becomes necessary to regenerate NAD+; because fermentation converts pyruvate to lactate (or ethanol), therefore NAD+ is available for glycolysis, rather than continuing aerobic respiration.

• A remote island ecosystem experiences a volcanic eruption that eliminates all vegetation and animal life. Which process explains the subsequent, predictable recolonization of the island by various species?
• If a diploid cell with 2n=4 chromosomes undergoes meiosis, which consequence follows regarding genetic diversity?
• What happens to the targeted DNA sequence following a Cas9-mediated double-strand break and homology-directed repair?
• Which process is responsible for Gram-positive bacteria's susceptibility to penicillin?
• If a mutation disables the G protein in olfactory sensory neurons, which consequence follows?
• Which mechanism explains why damaged mitochondria trigger cellular self-destruction (apoptosis)?