Describe/summarize the four major stages of catabolism. ...

[genevieve1028]

Describe/summarize the four major stages of catabolism.

Question 2

What percentage of people in poor countries do not have enough to eat?
 a. 12
  b. 14
  c. 16
  d. 18

[durant1234]

Answer to Question 1

 Stage 1: complex molecules are broken down into their fundamental building blocks.
glycogenolysis  glycogen  glucose
proteolysis  protein  amino acids
lipolysis  triglycerides  fatty acids and glycerol molecules
 Stage 2: glucose, amino acids, fatty acids, and glycerol enter specific pathways in which each is converted into an intermediate product that can enter the citric acid cycle.
 Stage 3: intermediate products formed during Stage 2 enter the citric acid cycle and are broken down further to form carbon dioxide, releasing energy in the process. Much of the energy released during Stage 3 of metabolism is transferred to the coenzymes NAD+ and FAD, forming NADH + H+ and FADH2, respectively. In addition, small amounts of ATP are formed via substrate phosphorylation.
 Stage 4: begins when NADH + H+ and FADH2 enter the electron transport chain. The energy-yielding pathways of oxidative phosphorylation operate in nearly all cells to produce energy for cellular activities.

Answer to Question 2

c

[genevieve1028]

Great answer, keep it coming

[Sarahjh]

Wow, this really help