Question

This is a biochemistry question, please take the time to answer both questions and I will like as soon as the answer is posted. Thanks in advance!

QUESTION 9 Glycolysis is divided into two stages. Identify which of the following characteristics pertain to stage 1 or stage 2 of glycolysis. A. stage 1 - ATP is utilized B. stage 2 - ATP is synthesized - Six-carbon compounds are involved Only three-carbon compounds are involved - - NADH is produced QUESTION 10 What is substrate-level phosphorylation? phosphorylation of AMP by ATP phosphorylation of glycolytic intermediates ATP synthesis when the phosphate donor is a substrate with high-phosphoryl-transfer potential phosphorylation of ADP coupled to an ion gradient synthesis of ATP and AMP from two molecules of ADP

Answer 1

ANS 9. Glycolysis occurs mainly in 2 stages

Stage 1 is the investment stage because in these steps two molecules of ATP are consumed/utilized for each molecule of glucose.

Stage 2 is the harvesting stage in which 4 molecules of ATP and 2 molecules of NADH are gained from each initial moles of glucose.

ANS 10. Substrate level phosphorylation is when ADP is converted to ATP by the direct transfer of a phosphate group. The phosphate group is donated or transfered from a phosphorylated intermediate.

The phosphate comes off of one molecule (the intermediate) and is directly transfered to another (the ADP). The energy for the phosphorylation of ADP is provided directly from breaking the high energy phosphate bond on the intermediate molecule.

The most famous examples of substrate level phosphorylation are found in the glycolysis pathway.