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Web/CD Activity
6A
Overview of Cellular Respiration
illustration in Module 6.8 introduces the three stages of cellular respiration. After
rtr-rdying it, see if you can label the diagram below without referring to the text' Include
t,l".i.orr-trurrrpori chain and chemiosmosis, pyruvic acid, mitochondrion, Cor, highATP,
c,rergy electrons carried by NADH, Krebs cycle, glycolysis, cytoplasmic fluid,
are
places,
gto.or", and NADH and FADHT. (Note: 3,6, and 7 are processes, 8 and 11
I
he
,rnd the rest are inputs and outputs.)
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1,
ATP
Web/CD ActivitY
6B
,3 ATP
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1^$
GlYcolYsis
by matching
Glycolysis is the first of three steps in cellular respiration. Review glycolysis
twice'
used
pio"ru on the right with a term on the left. Some terms are
"u"t,
A NADH
fi
6
F
4/
Pyruvic acid
ATP
NAD+
Glucose
Glycolysis
ADP and P
Oxygen
Intermediate
d
t+
e
(:
-Lt)
g
A
F
A
1. Compound formed between glucose and pyruvic acid
2. Not involved in glYcolYsis
3. Fuel molecule broken down in glycolysis
4, Produced by substrate-Ievel phosphorylation
5. Invested to energize glucose molecule at start of process
6. Reduced as glucose is oxidized
7. Glucose converted to two molecules of this
8. Assembled to make ATP
9. "splitting of sugar"
tO. Carries hydrogen and electrons from oxidation of glucose
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Wrb/CD Activity
6C
The Krebs Cycle
l'1'ruvic acid from glycolysis is chemically altered and then enters the Krebs cycle, a series
of stcl'rs that completes the oxidation of glucose. The energy of pyruvic acid is stored in
NADH and FADHT. To review these processes, fill in the blanks in the diagram below. (Try
to do as many as you can without referring to the text.) Include the following: NAD+, pyruvic acid, CO2, FADH2, NADH, coenzFne A, ATP, and acetyl CoA.
NAD'
(F-{F.
FWI
.
H+
4
,t
tr.,l\C OOld
4..
i.
i:;
3F-ffiH-l
+3H+
,
Web/CD Activity
6D
AlP
Electron Transport and Chemiosmosis
Circle the correct words or phrases in parentheses to complete each sentence.
rn G,i;',,q
drlerpbuilt into th.5 loutrr@o"rnirun" of
chain is a sequence of A(electron, i=-.-/-----\
the mitochondrion. Molecules tAD!,&ApflDbring hydrogens and electrons to the
"f
chemiosmosis). The electrons move along the
chain from glycolysis and 7
jkinfromcarriertocarrierinaseriesof redoxreactiqlefinallyjoiningwith8 (HzO,CO2,
(3J""a
lfrc
H+ from the surrounding solutior
electrons is used to move protons-10
lrrtssltrc transport)
t(@ co2, o). Energyfleasedbx\
l+rT
,oD affi,nolecules)-by 11 (@y, trortsport)
@
into the space between the inner and outer mitochondrial membranes
Tlrc buildup of protons in the intermembrane space-a proton gradient-constithat the cellcan tap to make B@giurose). The-9{(:('rltrirti()r1 of protons tends to drive them back through the membrane into the laKinner
trrtcs rr
(kit,di46;ifunergy
Hozo Cells Haraest Chemicnl Enttrgtl
but protons can cross the membrane
passingEro"gh special protein complexes, called 75 (coetuy,ne Ot@:y_
,domparttnent of the mitochondriol,t, cytoplasm of the cell),
/
onlv_bV
As these compJexes allow protons back through the membrane, their enzvmes
the enelgy of the moving protons to phospho"rylate 16 rruao,@4g1 -ut
"
tz
lNanU(ArPl Thus, electron transport and chemiosmosis transform 79@Dto*t, o
small portion) of the energy extracted from glucose into the phosphate bonds of ATP.
thnses).
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Web/CD Activity
6D
Electron Transport and Chemiosmosis
will help you review electron transport, chemiosmosis, and how poisons
disrupt them. In the first diagram, show how the processes work normally. Trace movement of an electron with an orange arrow, movement of H+ ions (active transport and
chemiosmosis) with black arrows, and formation of ATP with a pink arrow.
In the second diagram, draw arrows showing the movement of electrons and H+
and the formation of ATP, as in the first diagram. Then draw a red line where each poison
acts, to show how each of the poisons short-circuits the normal processes. Label the poisons
rotenone, cyanide, carbon monoxide, DNP, and oligomycin.
These diagrams
1. Normal electron
transport and chemiosmosis:
srioltt
2.
Effects of poisons:
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Chnptar 6
Web/CD Activity 64
Web/CD Activity 6B
Web/CD Activity 6C
Web/CD Activity 6D
Overuiew of Cellular Respiration
Glycolysis
The Krebs Cycle
Electron Transport and Chemiosmosis
Check your overall understanding of cellular respiration by matching each of the
phrases
below with one of the three stages of the process. Use G for glycolysir, K for Krebs cycle,
and E for electron transport and chemiosmosis.
E-
_G_
G
1.
J.
.t.
-(2_
Es.
-To.
V.
:'j
j':
t
!
r.
Es.
K,
E
E
(
Generates most of the ATP formed by cellular respiration
2. Begins the
e.
ro.
rt.
tz.
oxidation of glucose
Occurs outside the mitochondrion
Produces 4 ATPs per glucose by substrate-level phosphorylation, but 2 ATps per
glucose are used to get it started
Oxidizes NADH and FADH2, producing NAD+ and FAD
Carried out by enzymes in the matrix (fluid) of the mitochondrion
Here electrons and hydrogen combine with O, to form HrO
Occurs along the inner mitochondrial membrane
Generates most of the CO, produced by cellular respiration
FADH2 and NADH deliver hydrogen ions and electrons to this stage
ATP synthase makes ATP
Reduces NAD+and FAD, producing NADH and FADH,
Web/CD Activity
6E
Fermentotion
Review fermentation by filling in the blanks below.