BZ 440 EXAM 2 Questions AND Correct Answers
2 pigments involved in sunlight capture - ✔✔Chlorophylls and Carotenoids. They
absorb wavelengths in the spectrum of visible light (PAR): λ = 400-700 nm. They
reflect yellow and green light, while absorb blue and red light.
After Calvin Cycle: Fates of G3P - ✔✔1. Respiration to CO2
2. All other C molecules
3. Glucose
-Starch: plastid storage
-Celluose: cell wall struct.
-Sucrose: Vacular O storage or export via Phloem
Allocation - ✔✔Metabollic fate of a compound (photosynthate, particularly):
e.g. what fraction is stored as sucrose or starch, and what fraction is respired or
metabolized
Carbon enters the plant in the form of... - ✔✔CO2
Carbon is coupled to_____ to form ______ - ✔✔RuBP, G3P (C3 sugar)
Carbon is fixed by the enzyme... - ✔✔Rubisco
Carotenoids (carotenes, xanthophylls) - ✔✔Essential in protection of plants
from high intensity light radiation, secondary role in light capture.
, Chlorophylls (a and b) - ✔✔Main pigments, essential for light capture.
CO2 compensation Point - ✔✔The rate of photosynthesis that matches the rate
of respiration. Higher in C3 than C4 or CAM
Describe chemiosmosis: - ✔✔Protons are pumped over the membrane, creating
a proton gradient. The protons flow back to the stroma via an ATP synthase,
creating ATP
Explain "separation in space" - ✔✔1. Malate is produced in the mesophyll cells
2. It moves to the budle sheath cells
3. It is decarboxylated and CO2 is fixed by rubisco
Explain "seperation in time" - ✔✔1. PEPC fixes CO2 at night (plants keep the
stomata closed during the day)
2. Malate is produced (at night) and stored in the vacule
3. During the day, malate exits the vacule and is decarboxylated. CO2 is fixed by
rubisco in the same cells
Explain how ATP is synthesized during light reactions - ✔✔Through
photophosphorylation. e- flow through the ETC. The concentration of H+
increases in the lumen of the thylakoids because: 1. H+ are pumped over
thylakoid membranes from the stroma to the lumen (using E from e- transport);
2. splitting of water releases more H+ in lumen; 3. synthesis of NADPH lowers
H+ in stroma. This leads to a H+ GRADIENT OVER THE THYLAKOID MEMBRANE.
H+ diffuse back from lumen to stroma through ATP sythase => ATP produced.
2 pigments involved in sunlight capture - ✔✔Chlorophylls and Carotenoids. They
absorb wavelengths in the spectrum of visible light (PAR): λ = 400-700 nm. They
reflect yellow and green light, while absorb blue and red light.
After Calvin Cycle: Fates of G3P - ✔✔1. Respiration to CO2
2. All other C molecules
3. Glucose
-Starch: plastid storage
-Celluose: cell wall struct.
-Sucrose: Vacular O storage or export via Phloem
Allocation - ✔✔Metabollic fate of a compound (photosynthate, particularly):
e.g. what fraction is stored as sucrose or starch, and what fraction is respired or
metabolized
Carbon enters the plant in the form of... - ✔✔CO2
Carbon is coupled to_____ to form ______ - ✔✔RuBP, G3P (C3 sugar)
Carbon is fixed by the enzyme... - ✔✔Rubisco
Carotenoids (carotenes, xanthophylls) - ✔✔Essential in protection of plants
from high intensity light radiation, secondary role in light capture.
, Chlorophylls (a and b) - ✔✔Main pigments, essential for light capture.
CO2 compensation Point - ✔✔The rate of photosynthesis that matches the rate
of respiration. Higher in C3 than C4 or CAM
Describe chemiosmosis: - ✔✔Protons are pumped over the membrane, creating
a proton gradient. The protons flow back to the stroma via an ATP synthase,
creating ATP
Explain "separation in space" - ✔✔1. Malate is produced in the mesophyll cells
2. It moves to the budle sheath cells
3. It is decarboxylated and CO2 is fixed by rubisco
Explain "seperation in time" - ✔✔1. PEPC fixes CO2 at night (plants keep the
stomata closed during the day)
2. Malate is produced (at night) and stored in the vacule
3. During the day, malate exits the vacule and is decarboxylated. CO2 is fixed by
rubisco in the same cells
Explain how ATP is synthesized during light reactions - ✔✔Through
photophosphorylation. e- flow through the ETC. The concentration of H+
increases in the lumen of the thylakoids because: 1. H+ are pumped over
thylakoid membranes from the stroma to the lumen (using E from e- transport);
2. splitting of water releases more H+ in lumen; 3. synthesis of NADPH lowers
H+ in stroma. This leads to a H+ GRADIENT OVER THE THYLAKOID MEMBRANE.
H+ diffuse back from lumen to stroma through ATP sythase => ATP produced.
