7.2 glycose- glucose- 2 pyruvate

Question 1

What is glycolysis?

Answer 1

• The partial oxidation of glucose and the synthesis of a relatively small amount of both ATP and reduced electron carriers.
• Its the splitting of a 6 carbon glucose sugar to 2, 3 carbon molecules which is anaerobic since oxygen isn’t consumed.
• a series of 10 chemical reactions
• yields 4 ATP and 2 NADH resulting in 2ATP and 2 NADH

Question 2

How does glycolysis begin?

Answer 2

a molecule of glucose that produces two 3-carbon molecules of pyruvate and a net total of 2 molecules of ATP (substate level phosphorylation) and two molecules of NADH.

Question 3

What are the three phases of the 10 reactions?

Answer 3

phase 1: preparatory phase with consumption of 2 ATP
phase 2: cleavage phase
phase 3: payoff phase with production of 4 ATP and 2 NADH

Question 4

what occurs during the first phase of glycolysis?

Answer 4

• prepares for the next 2 phases with addition of 2 phosphate groups to the glucose which requires energy provided by hydrolyzing 2 molecules of ATP.
• endergonic process
• phosphorylated glucose is now stuck in inside cell and the addition of the 2 negatively charged phosphates destabilizes the molecule so that it can be broken apart.

Question 5

what occurs during the second phase of glycolysis?

Answer 5

a cleavage phase where the 6 carbon molecule is split into 2 3-carbo molecules

Question 6

what occurs during the third phase of glycolysis?

Answer 6

the payoff phase since ATP and NADH are produced. NADH contributes to the synthesis of ATP which overall ends in the production of 2 pyruvate molecules.