a) Using full chemical structures of substrates and products, draw the two possible pyruvate reduction pathways that regenerate NAD+ from NADH in the absence of oxygen gas. Give names of all compounds and enzymes involved. b) Draw the step in glycolysis that requires at least one of the above pathways to be functional in the absence of oxygen. Give names of all compounds and enzymes involved.

Outline the conditions that direct pyruvate toward the following:(a) Entry into the citric acid cycle(b) Conversion to ethanol and CO2(c) Conversion to lactate(d) Glucose synthesis (gluconeogenesis)In what tissues or organisms is each pathway present?

In order to metabolize lactose, most infants express the enzyme lactase in their intestines.   How many pyruvate molecules and NADH molecules can be generated in glycolysis from one lactose molecule? Please explain.   How many ATP molecules will be used and generated by 1 lactose molecule? Please explain.

The following image is a schematic of the metabolic processes occurring in a plant contained in a closed container.   A=Light Dependent reactions B=Glycolysis C=Light Independent Reactions D=Kreb's cycle E=electron transport chain   2a) Use the figure above to explain the conditions in which the oxygen concentration remains constant in the container. b) 2-carboxyarabinitol-1,5-bisphosphate (CABP) is an inhibitor of the enzyme rubisco. Which pathway would this affect most?

Explain in detail of the process of cellular respiration, including all the stages of cellular respiration (glycolysis, pyruvate oxidation, citric acid cycle, and oxidative phosphorylation) and explain the substrate and product of each pathway. And make a table of the products formed at the end of glycolysis, pyruvate oxidation, citric acid cycle, and oxidative phosphorylation (ATPs, NADHs, water, and carbon dioxide). Then discuss about oxidation-reduction of various molecules that are a part of these pathways.

Indicate what will happen (increase, decrease or no effect) to the activity of the enzyme or rate of the metabolic pathway given the following conditions.

Concerning the use of pyruvate when ratio of NADH/NAD+ is low, what is the fate of the carbon labeled in pyruvate when metabolized under these conditions? a) Production of glucose b) Oxidation to CO2 via the TCA cycle c) Conversion to pyruvate to generate oxaloacetate to move electrons to the cytosol via the malate shuttle d) Pyruvate is never metabolized by the cell, instead pyruvate is converted to lactate and solely exported for the Cori cycle and dependent on the liver to recycle the carbon skeleton

Q) You are following the metabolism of aspartate that is equally labeled on all 4 carbons. Following a transamination aspartate is converted into oxaloacetate. Assuming the resulting Oxaloacetate is used as the substrate for the TCA cycle answer the following questions: a) Describe ALL the oxaloacetate molecules that would result from the first turn of the TCA cycle. b) Briefly describe how there is still label detected on the carboxylic acids even though they were removed as CO2 during the first turn of the cycle. (2 sentences MAX)

For Pyruvate Decarboxylation (Link Reaction), what are steps of cellular respiration for both aerobic (oxygen present) and anaerobic (without oxygen) respiration.  what are the Inputs and Outputs: Clearly indicate the key substrates, intermediates, and products at each stage. Location: Show where this stage of cellular respiration occurs within the cell (e.g., cytoplasm, mitochondria). Energy Production: Highlight the ATP and NADH production at this stage. Oxygen: Show where oxygen is used in the process (e.g., ETC) and where carbon dioxide is produced. Electron Carriers: Indicate the role of electron carriers such as NAD+ and FAD in transferring eleDiagrams: Use diagrams or icons to represent the structures and molecules involved, such as the mitochondria, glucose, ATP, and oxygen. Key Information like important facts or formulas relevant to cellular respiration, like the chemical equations for each stage.

Which of the listed glycolytic enzymes adds a phosphate group to ADP to produce ATP?  1.) pyruvate kinase 2.) hexokinase 3.) phosphofructokinase-1 4.) pyruvate dehydrogenase 5.) phosphexose isomerase 6.) lactate dehydrogenase