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5 Biology Cellular Respiration multiple choice questions??! NEED HELP!

Hello. Could you please explain this to me.. I am really stuck and would like to gain a better understanding. I did try the last three questions. Im mainly lost on the first two.
 
Question 1: How many reactions in glycolysis directly generate ATP?

3
2
1
4
5
 
Question 2: In the absence of oxygen, fermentation:

generates ATP from the reduction of pyruvate.
regenerates NAD+ from the reduction of pyruvate.
None of the other answer options is correct.
generates ATP from the oxidation of pyruvate.
regenerates NAD+ from the oxidation of pyruvate.
 
You may be familiar with the story of Philippides, the famous Greek runner who ran the first marathon and then died after completing his run. Based on what you know of aerobic respiration and fermentation, why might Philippides have died?

His muscles may have produced toxic levels of both ethanol and lactic acid, causing his blood to become more acidic.
His muscles may have produced toxic levels of ethanol, causing his blood to become more basic.
His muscles may have produced toxic levels of lactic acid, causing his blood to become more acidic.*I think its this one
His muscles may have produced toxic levels of ethanol, causing his blood to become more acidic.
His muscles may have produced toxic levels of lactic acid, causing his blood to become more basic.

4. The MOST stable?that is, least reactive?form of carbon is:

pyruvate.
ethanol.
diamond.
glucose.
carbon dioxide.
*would it be glucose?

5. In eukaryotic cells, the oxidation of pyruvate occurs in:

vacuoles.
the endoplasmic reticulum.
the nucleus.
the cytoplasm. **I think its this one
the matrix of the mitochondria.
 
Thank you for the help!! I am especially confused by the first two questions.
 
 

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Bryan K. | Science and Math Tutor at your serviceScience and Math Tutor at your service
4.3 4.3 (3 lesson ratings) (3)
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1) 2 reactions in glycolysis yield ATP directly
 
2) Probably NOTA - lactic acid is converted back to pyruvate by oxidizing NADH
 
3) I agree; it makes the  most sense - lactic acidosis leading to seizure or heart arrhythmia
 
4) Diamonds
 
5) yes - cytoplasm