Exam Three: Stages of Cellular Respiration Basics, Details of Glycolysis, Feedback Inhibition

First stage of cellular respiration

glycolysis

Glycolysis

6C glucose is broken down into two molecules of pyruvate (3C each)

Second step of cellular respiration

pyruvate processing

pyruvate processing

each 3C pyruvate is oxidized into a 2C acetyl-CoA

Third step of cellular respiration

Citric Acid Cycle (Krebs Cycle)

Citric acid cycle

acetyl-CoA is oxidized into CO2

Fourth step of cellular respiration

Electron transport and oxidative phosphorylation

Electron transport and oxidative phosphorylation

Most of NADH and FADH2 drop off their electrons at the ETC

ETC

electron transport chain

After many redox reactions ______ is made in electron transport and oxidative phosphorylation

ATP

Glycolysis occurs in

cytosol

two major phases of glycolysis

energy investment and energy pay off

Glycolysis harvests energy by

oxidizing glucose

Uses 2 ATP to phosphorylate intermediate compounds

energy investment phase

the energy investment phase is a _______ reaction

endergonic

third enzyme in energy investment phase

phosphofructokinase

important regulatory point of no return

phosphofructokinase

G3P

glyceraldehyde 3-phosphate

what happens is phosphofructokinase is not inhibited

the reactions proceed and glycolysis continues

When ATP binds to the regulatory site of phosphofructokinase (instead of the active site) the reaction rate ____

slows down dramatically

ATP can act as an allosteric inhibitor during the energy investment phase of glycolysis by

binding to the regulatory site of enzyme 3

type of allosteric inhibition where the entire pathway turns off

feedback inhibition

why does feedback inhibition occur

to ensure that resources are not wasted

allosteric inhibitor binds to the regulatory site and stops the substrate from binding to the enzyme when there is already enough of the product

feedback inhibition

how many total ATP are produced in the energy pay-off phase of glycolysis

4

how many times does the energy pay-off phase occur in glycolysis

twice, occurring once for each G3P

ATP in the energy pay off phase are made by

ADP substrate level phosphorylation

bonding with a phosphate at the active site of an enzyme

substrate level phosphorylation

After glycolysis, the pyruvates move into

the matrix of the mitochondria

What is the net products of glyolysis

2 ATP, 2 NADH, and 2 Pyruvates