Multiple choice

Which of the following statements regarding metabolic pathways is incorrect?

  1. Many of the steps of glycolysis can run in reverse.

  2. Starch, sucrose or glycogen must be hydrolysed before it can enter the glycolysis.

  3. After fats are digested, glycerol enters glycolysis by forming DHAP.

  4. After fat digestion, fatty acids can no longer participate in cellular respiration.

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fatty acids can be used in cellular respiration, they do not have to be turned into glucose first.  Instead, the fatty acids are broken down into 2-carbon molecules that enter the cellular respiration events to make ATP.  Glucose, a 6-carbon molecule, gets broken down into 3-carbon and then 2-carbon molecules as it goes through cellular respiration.  Therefore, the 2-carbon molecules from fatty acids just join into the process where the 2-carbon molecules are normally used.   Because they join in a little late in the process, they donot yield as much energy as glucose does, but they still generate some ATP. 

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