Cellular Respiration

Question 1

What is Cellular Respiration

Answer 1

Biochemical reactions in the cell that involve breakdown and oxidation of molecules to liberate energy

Question 2

Where does glycolysis occur

Answer 2

In the Cytoplasm

Question 2

Briefly explain the process of glycolysis

Answer 2

Glucose 6-P(Isomer)= Fructose 6-P(Phosphorylation)= Fructose 1,6-biP

Breakdown= 2 G3P one dihydroxyacetone phosphate (Aldose enzyme)

G3P oxidized, release H2 atom transfers to NADP

Inorganic P + G3P= 1,3-biphosphogycerate(hydrolysis)= 3PG+APT

(Isomer) 3PG=2PG(Dehydration)=PEP+H20

SLP PEP=Pyruvate , ADP=ATP

Question 3

What is the net product of glycolysis

Answer 3

2ATP, 2Piruvate, 2NADH=2H+

Question 4

Explain the process in link reaction

Answer 4

Occurs in presence of O2, co2 is removed
Lose 2 H+ transfer to NAD+
Pyruvate turns to Acetyl-coA

Question 5

Explain Krebs Cycle

Answer 5

CoA helps acetyl enter Krebs Cycle
Acetyl(2C)+Oxaloacetate(4C) , citric acid.(Condensation)

Isomerization=Citric acid>Iso acid

Oxidative decarboxylation=Isocitrate>a-Ketoglutarate(5C)- Co2, NAD>NADH

Repeat OD=5C>4C(succinyl-CoA

SLP=Unstable S CoA> Succinate(4C). CoA replaced by P. GDP+P=GTP
GTP transfers P to ADP=ATP

Oxidation. 4C= Fumarate (4C) , FAD=FADH2

Hydration= Fumarate= Malate

Oxidation, Malate=oxaloacetate, NAD=NADH

Question 6

Name Complex I,II,III,IV in ETC

Answer 6

I=NADH reductase
II=Succinate Dehydrogenase
III=Cytochrome Reductase
IV=Cytochrome oxidase

Question 7

Explain the role of NADH FADH2

Answer 7

1. in reduced form carrying e and H
   2.Transport high e and H from Krebs
   to ETC

Question 8

Explain the transport of e in ETC

Answer 8

1. NADH binds with Complex I, FADH2> Complex 2

2.Flow of electron from NADH in
ETC:Complex I → CoQ →
Complex III → Cyt.c →
Complex IV
Flow of electron from FADH2 in
ETC: Complex II → CoQ →
Complex III → Cyt.c →
Complex IV

Extra= Complex 2 only release a little energy. Same to CoQ Cyt.c