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Review
What type of Macromolecule is shown below?
A. Carbohydrate
B. Lipid
C. Protein
D. Nucleic Acid
Review
What type of Macromolecule is shown below?
A. Carbohydrate
B. Lipid
C. Protein
D. Nucleic Acid
Review
What type of Macromolecule is shown below?
A. Carbohydrate
B. Lipid
C. Protein
D. Nucleic Acid
Bring it Home
Macromolecule Building Block Function Elements
Carbohydrate Monosaccharide Quick Energy C1H2O1
Protein Amino Acid Structural &
Enzymes
CHON
Lipid Triglyceride Long-term
Energy;
Insulation
CHO
Nucleic Acid Nucleotide Store Genetic
Information
CHONP
Bring it Home
Macromolecule Reagent + Color Test
Simple Carbohydrate
#Sugar
Benedict Burnt Orange to
Reddish
Complex Carb
#Starch
Lugol’s Iodine Dark Purple to Black
Protein Biuret Lavender to Purple
Lipid Sudan III Red
Objective
• Learn the steps of how energy is
transformed from sunlight to usable ATP
(energy) and glucose
Why is Photosynthesis important?
Makes organic molecules (glucose) out
of inorganic materials (carbon dioxide
and water).
It begins all food chains/webs. Thus
all life is supported by this process.
It also makes oxygen gas!!
Photosynthesis-starts to ecological food webs!
Plants use sunlight to turn water
and carbon dioxide into glucose.
Glucose is a kind of sugar.
Plants use glucose as food for
energy and as a building block for
growing.
Autotrophs make glucose and
heterotrophs are consumers of it.
Photo-synthesismeans "putting together with light."
10
Photosynthesis: Autotrophic Process
• Uses light Energy to convert Water (H20) and Carbon Dioxide (CO2) into Oxygen (O2) and Sugar (sugars, e.g. Glucose) & Starches
How do we know that plants make
carbohydrates from just carbon dioxide
water and light energy?
• For example:
Jan Baptisa van Helmont (1648) planted a
willow branch weighing 5 pounds into 200
pounds of soil and then after 4 years the tree
weighed 169 lbs. and the soil was still
nearly 200 lbs.
Experiments!
12
The Photosynthesis Equation
Photosynthesis
Carbon dioxide + water glucose + oxygen
sunlight
absorbed by chlorophyll
6CO2 + 6H2O + energy C6H12O6 + 6O2
As can be seen from the equation for photosynthesis, the
wood, bark, and root came from water and carbon
dioxide.
Check it!
Plants in Action
What is the
process
that uses
the sun’s
energy to
make
simple
sugars?
The photograph below is an elodea leaf X 400.
Individual cells are clearly visible. The tiny
green structures within the cells are
chloroplasts
this is where
photosynthesis
happens.
Chloroplasts make the sugars!
PHOTOSYNTHESIS HAPPENS IN
CHLOROPLASTS
= sac-like
photosynthetic = stack of thylakoids
membranes
inside chloroplast
THYLAKOIDSGRANUM (pl. grana)
SPACESTHYLAKOID
SPACESTROMA
cytoplasm
Gel-filled space
Inside the
thylakoid
sac
Gel-filled space inside
chloroplast surrounding
thylakoid sac
Gel-filled space OUTSIDE chloroplast but inside the cell membrane
PHOTOSYNTHESIS HAPPENS IN
CHLOROPLASTS
Proteins that are part of the thylakoid
membrane house
________________________________ into
clusters called Photosystems
_____________________
Light absorbing PIGMENTS
20
Pigments• In addition to water, carbon dioxide, and light energy, photosynthesis requires Pigments
• Chlorophyll is the primary light-absorbing pigment in autotrophs
• Chlorophyll is found inside chloroplasts
Chloroplasts
make the
oxygen too!
PHOTOSYNTHESIS
• Absorbing Light Energy to make chemical
energy: glucose!
• Pigments: Absorb different colors of white light
(ROY G BIV)
• Main pigment: Chlorophyll a
• Accessory pigments: Chlorophyll b and Carotenoids
• These pigments absorb all wavelengths (light) BUT
green!
PHOTOSYNTHESIS
• Why do we see green?
• Green color from white light
reflected NOT absorbed
• Chloroplast: organelle
responsible for photosynthesis
• Chlorophyll: located within
Chloroplast
• Green pigment
Visible light is only
a small part of the
electromagnetic
spectrum (all forms
of light).
EQUATION FOR
PHOTOSYNTHESIS
6CO2 + 6H2O +ENERGY C6H12O6 + 6O2
CARBON
DIOXIDE
WATER
GLUCOSE
OXYGEN
Time to Dig Deep!!!
PHOTOSYNTHESIS
• 2 Phases
• Light-dependent reaction
• Light-independent reaction aka Calvin Cycle
• Light-dependent: converts light energy into chemical energy; produces ATP molecules to be used to fuel light-independent reaction
• Light-independent: uses ATP produced to make simple sugars.
PHOTOSYNTHESIS
Light-Dependent
Reaction
Light-Independent
Reactions
Light &
Water
Oxygen
ATP
NADPH
Light Dep. Reaction
PHOTOSYNTHESIS
Light-Dependent
Reaction
Light-Independent
Reactions
CALVIN CYCLE
Light &
WaterOxygen
ATP
NADPH
Carbon
Dioxide Glucose
Calvin Cycle
PHOTOSYNTHESIS
• Light-independent reaction (Calvin Cycle)
• Does not require light
• Calvin Cycle
• Occurs in stroma of chloroplast
• Requires CO2
• Uses ATP and NADPH as fuel to run
• Makes glucose sugar from CO2 and Hydrogen
Check it!
1. The process that uses the sun’s energy to
make simple sugars is _____________.
A. Cellular respiration
B. Glycolysis
C. Photosynthesis
D. Photolysis
Check it!
2. The function accomplished by the light-
dependent reactions is ______________.
A. Energy storage
B. Sugar production
C. Carbon fixation
D. Conversion of sugar
Factors that Affect Photosynthesis____________________
Water is one of the raw materials needed, so
A shortage of water can ________________
photosynthesis
AMOUNT OF WATER
http://www.hononegah.org/departments/Anderson/cactus.JPG
Desert plants and conifers
that live in dry conditions
have a waxy coating on
their leaves to prevent
water loss.
slow or stop
Factors that Affect Photosynthesis
Photosynthesis enzymes function best between 0° C - 35° C
At temperatures above or below this range, photosynthesis will slow or stop
Conifers in winter may carry out
photosynthesis only occasionally
TEMPERATURE
http://www.sustland.umn.edu/maint/images/evergreen10.jpg
Enzymes work BEST at a certain ___ and __________.
Conditions that are TOO ACIDIC
or TOO HOT cause proteins
to unwind or _________
pH temperature
DENATURE
http://www.desktopfotos.de/Downloads/melt_cd.jpghttp://www.nealbrownstudio.com/adm/photo/163_nb_fried_egg.jpg
REMEMBER CELL BIO
Denaturing changes the shape of the enzyme making it not work
Image
from:http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookCHEM2.html
HOMEOSTASIS (keeping pH and temperature constant) is important for maintaining enzyme function.
Factors that Affect Photosynthesis
____________________
More light increases rate of photosynthesis
up to a certain level until plant reaches its
maximum rate of photosynthesis
LIGHT INTENSITY
See effect of
light experiment
http://206.173.89.42/REALTYWITHALOHA_COM/piphoto/funny%20sun%20with%20sunglasses.gif
http://www.teachnet.ie/foneill/exper.htm
THE BIG PICTURE
PHOTOSYNTHESIS provides
the _____________ we breathe
and the __________
heterotrophs (like us)
consume to survive
_____________ + ____________ _______________ + ____________
Carbon
dioxide WATER Sugars Oxygen
OXYGEN
sugars
Photosynthesis
includes
of
take place intakes place in uses
to produce to produce
use
Concept Map
Photosynthesis
includes
of
take place intakes place in uses
to produce to produce
use
Light-dependentreactions
Calvin cycle
Thylakoidmembranes
Stroma NADPHATPEnergy fromSunlight & water
ATP NADPH O2 Chloroplasts Glucose
Concept Map