CH 7Lab Cellular Respiration

Question 1

What is the initial substrate for glycolysis?

Answer 1

Glucose

Question 2

What are the final products of aerobic respiration?

Answer 2

ATP and CO2

Question 3

During respiration does glucose get oxidized or reduced?

Answer 3

Oxidized to CO2 and H2O

Question 4

What is the overall equation for glucose oxidation?

Answer 4

C6H12O6 + 6O2 goes to 6CO2 + 6H2O + energy

Question 5

Why would it be a bad idea to transfer the electrons directly from the glucose molecule to oxygen?

Answer 5

Cannot harness energy

Question 6

Give an example of spontaneous process?

Answer 6

Water flowing downhill

Question 7

What happens in a redox reaction, give an example

Answer 7

Transfer of electrons between atomsAn object falling from from a location of high potential energy to a location of low potential energy

Question 8

Why are partial electron transfers considered to be redox reactions?

Answer 8

Because one atom is more electronegative than the other which increases it’s electron density

Question 9

How can you estimate the relative energy content of an organic molecule?

Answer 9

Based on the number of c-c and c-H bonds

Question 10

What are the four stages of cellular respiration and where in the cell do they take place?

Answer 10

Glycolysis: cytoplasmacetyl coa synthesis : mitochondriaCitric acid cycle: mitochondriaOxidative phosphorylation: mitochondria

Question 11

How many carbon atoms are in glucose, pyruvate and acetyl coa?

Answer 11

632

Question 12

Which form NAD+ or NADH is ready to accept electrons, give up electrons, oxidized and reduced?

Answer 12

NAD+ picks up electrons, reducedNADH give up two electrons, oxidized

Question 13

Why are only 2 net ATP produced during glycolysis?

Answer 13

Because of the investment phase which costs 2 ATP

Question 14

What high energy molecule are produced during glycolysis?

Answer 14

2 ATP and 2 NADH

Question 15

Describe substrate level phosphorylation

Answer 15

Transfer of a phosphate group to ADP from an organic donor moleculeProduces small amount of ATP

Question 16

Describe oxidative phosphorylation

Answer 16

ATP is indirectly formed by the transfer of high energy electrons.Oxidizing nutrients to form ATPExtra phosphate comes from inorganic phosphate

Question 17

Where does substrate level phosphorylation occur?

Answer 17

Glycolysis and kerbs cycle

Question 18

Where does oxidative phosphorylation occur

Answer 18

Electron transport chain

Question 19

What happens to pyruvate in the living step between glycolysis and the krebs cycle?

Answer 19

Gets converted to acetyl coa and produce an NADH

Question 20

How many carbons are in the last intermediate step of the Krebs cycle before the actyl group is added?

Answer 20

4

Question 21

How many carbons are in the first intermediate step of the Krebs cycle before the actyl group is added? What is the name of the molecule?

Answer 21

6 Citric acid

Question 22

Beside ATP what other high energy molecules are produced during the Krebs cycle?

Answer 22

NADH and FADH2

Question 23

When is co2 produced during cell respiration?

Answer 23

During the Krebs cycle

Question 24

Where is the etc located?

Answer 24

Inner Cell membrane of the mitochondrion

Question 25

What is the function of oxygen in the etc?

Answer 25

It's a product that occurs when cytochrome c moves into complex 4 where oxygen is reduced to form water

Question 26

Where does fadh2 drop off its electron on the etc?

Answer 26

Complex 2

Question 27

Are H+ pumped into or out of the matrix during electron transport?

Answer 27

Out of the mitochondrial matrix

Question 28

Why does it require energy for electrons to be pumped trough the etc?

Answer 28

Because it pumping against their concentration gradient

Question 29

How do H+ electrons find their way to ATP synthase?

Answer 29

They go down their concentration gradient

Question 30

Does FADH2 produce as much ATP as NADH? Why or why not?

Answer 30

NoBecause NADH is pumped through complex 1 which allows it to pump more H+ before FADH2 can give up electron to complex 2

Question 31

Which pathways produces the most ATP?

Answer 31

The electron transport chain

Question 32

Where does glycolysis, CAC, ETC take place in a eukaryotic cell?

Answer 32

Cytosol, mitochondria, mitochondria

Question 33

When is NADH released during glycolysis?

Answer 33

When a C-H bond is broken

Question 34

When is ATP produced during glycolysis?

Answer 34

When a phosphate group attaches to a pyruvate

Question 35

When is NADH produce during the Krebs cycle?

Answer 35

When a C-H bond is broken

Question 36

How many carbons do pyruvate have before it's converted into acetyl coa and after?

Answer 36

3 and acetyl coa has 2

Question 37

When is co2 produced during the kreb cycle?

Answer 37

When a C-C bond is broken

Question 38

What are the net gains after glycolysis?

Answer 38

2 ATP 2 NADH 2 pyruvate

Question 39

What is the net gain after the Krebs cycle?

Answer 39

2 ATP8 NADH2 FADH2

Question 40

How much ATP does one molecule of NADH and fadh2 make?

Answer 40

NADH makes 2.5 ATPFadh2 makes 1.5