additional pathways re

Question 1

oxygens role

Answer 1

o2 will be the final resting place for electrons taken from glucose in cellular respiration

Question 2

where will glucose be supplied from?

Answer 2

Glucose will be supplied by the blood stream, and ATP/ADP from inside the cell

Question 3

why do we need oxygen?

Answer 3

without oxygen there is nowhere to drop electrons,
nadh cant be turned into nad+

Question 4

which electron carrier is empty

Answer 4

nad+, cant be remade, without it glycolysis comes to a halt

Question 5

the idea behind fermentation

Answer 5

• keeps glycolysis going
• no atp produced
• nad+ is being recycled
• oxidizing nadh and reducing a carbohydrate
• Fermentation pathways keep glycolysis going by allowing electrons to leave NADH, making NAD+ to oxidize G3P

Question 6

lactic acid fermentation

Answer 6

Our cells give the electrons back to pyruvate creating Lactic Acid. This creates NAD+ which can keep glycolysis going

• reduces pyruvate by giving it electrons from nadh, resulting in lactic acid and nad+
• build up of lactic acid results in: pH of blood to drop, burning and cramping of muscle (lack of atp), rigor mortis in dead tissue

Question 7

what happens when there is too much acid in tissue

Answer 7

denaturation causing rigor mortis

Question 8

is NADH oxidized in lactic acid fermentation

Answer 8

yes

Question 9

Heart attacks

Answer 9

cardiac muscle can go into lactic acid fermentation when arteries cant deliver enough o2

Question 10

role of the liver

Answer 10

lactic acid can be converted back to a pyruvate in the cori cycle
- lactic acid is flushed out of the blood where it is converted into pyruvate by the liver

Question 11

yogurt production

Answer 11

Bacteria take the lactose, break it down into glucose and galactose. These sugars then go through glycolysis. These anaerobic bacteria produce lactic acid that denatures the proteins in milk.

Question 12

do fermentation pathways allow glycolysis to continue

Answer 12

yes

Question 13

ethanol fermentation

Answer 13

Yeast remove a -COOH group and then grab the electrons from NADH producing ethanol. The carboxyl group exits as CO2

• done by several species of yeast and bacteria
• pyruvate loses a carboxyl and becomes acetylaldehyde
• reducing acetylaldehyde produces ethanol and NAD+

Question 14

molecules of ethanol fermentation in order

Answer 14

glucose
pyruvate
acetylaldehyde
ethanol

Question 15

in ethanol fermentation, is pyruvate oxidized or reduced to form ethanol?

Answer 15

oxidized

Question 16

What molecules are created when yeast bread dough is allowed to rise and bake?

Answer 16

ethanol, co2, and nad+

Question 17

Fermentation pathways recycle NAD+ to keep glycolysis going

Answer 17

true