anaerobic respiration is triggered when the ratio of ________falls below a critical level.

a.carbon dioxide supply to oxygen need
b.oxygen supply to glucose need
c.glucose supply to glucose need
d.oxygen supply to oxygen need

the electron transport chain is responsible for the production of the majority of cellular ATP...this is true correct?

d.

True. You really ought to have gone through the Krebs cycle and the electron transport chain to count the ATP production in each.

To determine the correct answer to the first question about anaerobic respiration, we need to understand the conditions that trigger it. Anaerobic respiration occurs when there is a lack of oxygen supply to meet the cell's energy demands. This means that the ratio of oxygen supply to glucose need falls below a critical level. Therefore, the correct answer is option b: oxygen supply to glucose need.

Regarding the second question about the electron transport chain, yes, it is responsible for the majority of cellular ATP production. During cellular respiration, the electron transport chain is the final step in oxidative phosphorylation, where electrons are transferred through a series of protein complexes, resulting in the creation of a gradient that drives the synthesis of ATP.