C) The condenser
Condenser is used to collect and focus the light from the illuminator on to the specimen.
https://documentcloud.adobe.com/link/track?uri=urn%3Aaaid%3Ascds%3AUS%3Aac7c68f3-8ce8-4b67-8bd4-3c08dbe79de2.
Here is a link for the worked out problems.
Hope that helps :)
The answer is 5:1 because you can evenly divide each side by five
Glucose gets broken down in glycolysis into two molecules of pyruvate, which gets converted into acetyl COA and enters the TCA cycle which Reduced electron transporters (NAD+ to NADH, etc) which are oxidized by the Electron transport chain which produces a proton gradient in the mitochondria that allows production of ATP by ATP synthetase