Class
Date
Name
LESSON 2.2 CELLULAR RESPIRATION
lnqui
15
Warm-Up
.ffi
Cellular Resp¡ration
Yeast are single-celled organisms that can cany out cellular respiration. In
this experiment, you will observe the activities of yeast and determine one
of the products of respiration.
INQUIRY FOCUS Predict
Procedure
r. E Label three test tubes 1, 2, and 3.
E
Materials
3 test tubes
U f,
Ut" the sraduated cylinder to
2.
lS
rneazure tu ñl of bromothymol blue for each
test tube. Bromothymol blue turns yellow in
the presence of carbon dioxide. CAUTION:
Bromothymol blue can stain skin and clothing.
test tube rack
beaker of yeast solution
(boiled)
beaker of yeast solution
(unboiled)
3. Add a pinch of sugar to each test tube.
4. Add 10 drops of boiled yeast to Test Tube
table sugar
bromothymol blue
marking pen or labels
for test tubes
25-mL graduated cylinder
2 eye droppers
1.
Add 10 drops of unboiled yeast to Test Tube 2.
CAUTION: Do not touch the yeast without gloves.
5. Put the test tubes in a safe place at room temperature
lor 24 hours.
6.
6
Wash your hands with soap and warm water.
7. Predict what will happen in each of the three test tubes
over the nert24 hours.
8. After 24 hours, record the color of each test tube
Think lt Over
I: O
Carbon dioxide is a waste product of cellular respiration. What evidence do you
have that cellular respiration took place in any of the test tubes?
Test tube 2 turned yellow. BTB is an indicator for carbon dioxide that turns yellow in the presence of CO2
O
How can you account for any differences between Test Tubes
O
What is the importance of Test Tube 3?
The yeast in test tube 2 were alive and could undergo cellular respiration!
This is the control with no yeast.
I
and}?
Class
Date
Name
After the I
iry Warrn-U
Cellular Respiration
lnquiry Warm-Up, Cellular Respiration
ln tñe lnquiry Warm-Up, you investigated one of the products of cellular respiration by
observing the actions of yeast. Using what you learned from that activity, answer the questions
below.
1. tureR What do you think produced the carbon dioxide in test tube
2?
The yeast went through cellular respiration. They broke down the sugar and produced CO2
Based on the results you observed in test tubes 1 and 2, what
do you think boiling does to yeast? Why do you think so?
2. tHren
The yeast in test tube 1 were dead and not able to do cellular respiration (there was not a strong color change)
3. l¡lren Why do you think a pinch
of sugar was added to each test
tube?
the sugar was used to "feed" the yeast so they could undergo cellular respiration
4.
pneOlCr How do you think the results of the experiment would have
been different if no sugar had been added to the test tuþes?
All the test tubes would have been blue since the yeast could not undergo cellular respiration.
,l
Copyright @ Pearson Education, lnc., or its affiliates. All Rights Reserved
Lesson 2.2 Cellular Respiration
Rcatling I What Happcrns During Cellular lLespiration on l)ag(rs 50-53 in your tcxtbook
Getting Energy
-
use the
picture bclorv to ansrvcr thc 2 qucrstions
l. Infer - color in the last 3 energy scales to show how the hiker's energy changes
2. How do you think the hiker's breathing rate changes as she climbs?
Welcome to
the toP
Low
High
Energy
Low
High
Low
High
High
Low
Scale
\
þ sr*t"tize
Conrplete tfte
corrccpt tn.¡Í,, be:lcrw aL¡ol¡t
Cellular Respiration Equation
c*llular res¡liratrort.
1\
Cellular Respiratlon
+
+
releases
USES
from
you get from
+
-_ù
Ó
f t0URf.
2
>:llmtrg¡Ûilfil
Releasin g Ene rgY
Cellular |espiration takes place in two stages
\ ldentity Fill in the missing terms in the spaces provided
Stage
1
lrr
lhe cytoplasnr,
¡s
2 ln the
, the
snraller molecules re.rct, producing
, w.rter, arrd large arnourrts
Stage
broketr dowrr
into smaller nrolecules, releasrnq
a
sm¿ll ¿¡r¡ount of
ol
Glucose
@
ô
t"
o
o
Smaller
t
Energy
5nlaller
molecules
Carbon
dic¡xide
molecules
Mltochondrion
ð
C¡oplasm
-i,
52
Water
.'Ð
\ü"/
,{ "#",,n,
Cet[ Processes and Energy
1å
¡c
is
'e
-l.r
:i'
n
i'
'i
l:'
Photosynthesis
Photosynthesis Word Bank
Energy
3r
Carbon Dioxide
Water
+
+
Energy
Glucose
1
Cellular Respiration
Assess
Your Understanding
Look at Figure 2 Releasing Energy on the page 3 of your lesson handout. How does Stage2
of cellular respiration benefit a cell?
1a.
lb. Why
does cellular respiration add carbon dioxide to the atmosphere, but photosynthesis does
not?
I get it! Now I know that during cellular respiration, cells
I need extra help with
f,csson 2.2 Clellular lìespiration
lLcading 2 What tlappcns During F"crmcntatiotl o¡r pitgcs 51-55 in \ t¡tlr tt'rtbook.
aPPlVtrl
A ball of bread dough mixed with yeast is left in a bowl at room temperature, As time passes,
the dough increases in size.
1.
How does fermentation that causes dough to rise differ from fermentation in muscles?
2.
How would you show that yeast was Íesponsible for making the dough rise?
How do living things get energY?
>:üf,!ËlÍiqlG¡g
Energy processes in living things
include photosynthesis, cellular resP¡rat¡on, and
ferm€ntat¡on,
îq Review Clrcla the correct answers and
complet€ the senlences ¡n the spaces provided'
Consu merç
Producers
Pl.rnt cells capture energy by u,ay
of r¡:lr tc' .\rrtlì{rsi',/l( r"( r,t ,l -n
.(-il(¡l.r/ rl,¡rirlrti,.rr).
easy 1oç; lhrcugh
the yioods gets energy by way ol
A runner on an
,.
¡:
i
r
o:.yi I ! . r.;'1.' t' l,,r rì ì,ì i ii,r ì.'
,,rr ¡r'r¡i,,rrL,;ri
<it
, ¡rl1
r
i r
Plants .¡re ðutotrophs becar¡se
The ru¡rner is a hc.torotroph
because she qets erret qy from
PIant cells release ener<¡y
cell function by way of
for
il>ir<¡tosyrrtIrt sis/{trrìrentltir)rì./
çcllL¡l¡r rr::i;ir¡rtior¡).
Plants cjet this energy when
oxygen reñcts witlì
lf ttre runner rrrakes a long, fast
push to lhe finish, her rnu:cle
cells may qet enerqy by way ol
(t¡lro i,-¡l y¡r I lrtt-: ìr.,rl<'r
r::(illr¡i,lr rc:,[]ir.)1,,i,r,,
r
r r¡-'r r L.
fhis process releases
and
r
l,<¡:
ri
less etretgy
I
f.
\:-.,
Assess
Your Understanding
2a. When arace ends, why do you think runners continue to breath quickly and deeply for a few
minutes?
2b. IIorv do livirrg things ¡.tct cncrrg,t"?
1
Class
Date
Name
20
Ouick Lab
r\
KJ
mtn
-t
Observ¡ ng Fermentation
Yeast are single-celled organisms that can caffy out fermentation (in addition
to cellular respiration). Fermentation is a process used by some organisms to
get energy out ofsugar without the presence ofoxygen.
INQUIRY FOCUS Observe
i
¡.r..
Procedure
r. B Et É Put on your goggles and gloves' Pour
warm waïer into two test tubes until each is almost
full. Add the 3 g of sugar to one of the test tubes.
Put the tubes in a test-tube rack. Use caution when
handling glass test tubes.
2. Add half of the dried yeast to each tube' Stir the contents
of each tube with a straw, Cover each tube with a small
piece of plastic wrap. Make sure the plastic wrap is not
too tight on the test tube.
3. Use a rubber band to secure the plastic wrap over the
Materials
2 test tubes
test-tube rack
warm water
1 g yeast
2 straws
plastic wrap
2 rubber bands
3 g sugar
clock
top of each tube.
4. Observe any changes that occur in the two test tubes
over the next 10 to 15 minutes.
5.
6
Wash your hands with warm water and soap'
Think lt Over
O
What changes did you observe in each test tube?
O
How can you account for any differences that you observed?
Test tube 1 had bubbles at the top of the column. Test tube 2 had no change.
Sugar was added to test tube 1 which allowed it to have food and undergo cellular respiration.
Since CO2 is a product of cellular respiration, we saw bubbles in test tube 1.
CELLULAR RESPIRATION
Copyright @ Pearson Education, lnc., or its affiliates. All Rights Reserved
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