Download Saturday Study Session 1 - TJ

Welcome to AP Biology
Saturday Study Session
Photosynthesis
Question 1
d
Clue: water is split in light reactions
Light
Reactions
light
thylakoids
ATP
NADPH
Calvin
Cycle
stroma
Organic
compounds
(carbs)
light
3
Question 2
c
Clue: oxygen
CO2 + H2O + light energy →
C6H12O6 + O2
Question 3
c
Clue: the entire length of the cell
H
Question 4
b
Clue: phycocyanin reflects blue
wavelengths
Compare absorption spectra of
cyanobacteria and plants
Pigments absorb free energy from light, boosting electrons
to a higher energy level in photosystems
Endosymbiosis
Question 5
d
Clue: electrons do not diffuse through ATP
synthase
Light Reactions of Photosynthesis
Conversion of potential energy into
kinetic energy drives formation of ATP
Question 6
a
Clue: low pH = high H+ concentration
Question 7
d
Clue: NADP+ and O2
F
Different energycapturing
processes use
different types of
electron acceptors
Math Grid In 1
The correct answer: 2.32 mg of carbon fixed/L
Solution:
ΔDO = DOf – DOi = 11.83 mg O2/L – 5.64 mg O2/L =
6.19 mg O2/L for the 24 hour period
6.19 mg O2/L x 0.698 ml/mg = 4.32 mL O2/L
4.32 mL O2/L x 0.536 mg/ml = 2.32 mg of carbon fixed/L
Math Grid In 2
# of Floating Disks over Time
Time (min)
# of floating disks
1
0
2
0
3
1
4
3
5
5
6
7
7
9
8
10
9
10
10
10
The correct answers:
Mode (the value that is repeated most often): 10
Median (the middle value): (5+7)/2 = 6
Range (the difference between the largest and the
smallest value): 10 – 0 = 10
Short Free Response 1
4 points possible
Short Free Response 1
1 pt per bullet
4 points possible
Explanation of data:
• As depth is increased, the net primary productivity decreases because
light decreases/lower rates of photosynthesis.
Description of relative rates of metabolic processes occurring at specific
depths according to the graph:
• The upper area of the graph is productive because light availability is
not a limiting factor at the surface.
• The rapidly decreasing productivity region is a result of decreasing light
available for photosynthesis.
• At 0, the rate of photosynthesis is equal to the rate of cellular
respiration due to limited light availability.
• Below 0, the rate of photosynthesis is less than the rate of respiration
due to insufficient light.
Short Free Response 2
3 points possible
Granum
Short Free Response 2
3 points possible
1 pt each:
• Photosynthetic pigments are the key light-trapping
molecules.
• Presence of the double outer membrane creates a
compartmentalized structure.
• Thylakoid membrane has a large surface area for light
reactions to produce ATP and NADPH.
• Thylakoid membrane contains electron carriers and
proton pumps which are needed to establish the proton
gradient.
• Thylakoid membrane contains ATP synthase for ATP
production.
• Stroma provides location for carbon fixation where CO2
is converted to carbohydrates.