1.Oxygen that is consumed during cellular respiration is returned to the environ
ID: 252544 • Letter: 1
Question
1.Oxygen that is consumed during cellular respiration is returned to the environment once it has been combined with which of the following substances?
ATP or inorganic phosphates
elemental carbon
nitrates or sulfates
glucose or nitrogen
carbon or hydrogen
2.Redox reactions involving Fe2+ and Fe3+ occur during aerobic cellular respiration. Where do these reactions take place?
Krebs cycle
glycolysis
the electron transport chain
the outer mitochondrial membrane
the cell membrane
3.The alternate fates of pyruvate in various organisms is primarily due to
optimizing the concentration of important biochemical intermediates
regenerating NAD+ for further reduction in the cytoplasm
maximizing ATP production in the mitochondrion
maximizing electron flow through the electron transport chain
none of the above
ATP or inorganic phosphates
elemental carbon
nitrates or sulfates
glucose or nitrogen
carbon or hydrogen
Explanation / Answer
(1)carbon or hydrogen
Oxidative breakdown of glucose and fatty acids in mitochondria release CO2 and Oxygen is also used as terminal electron acceptor forming water upon combining with hydrogen.
(2)
the electron transport chain
During electron transport electrons are shuttled from reduced equivalents to oxygen via iron-sulfur clusters.
(3)
regenerating NAD+ for further reduction in the cytoplasm
During anaerobic conditions, glycolysis has to continue to produce ATP, therefore NADH generated in during glycolysis are oxidized by pyruvate to lactate fermentation to regenerate NAD+ for glycolysis.
the electron transport chain
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.