Biochemistry 3300
Quiz 9
Instructor: Dr. H.-J. Wieden
2009-Apr-2
10:50 – 11:05
Name:_____________________ ID#:__________________
Page:1/2
1) In plants Photosystem II ______, and Photosystem I ______.
A)
B)
C)
D)
E)
+
oxidizes H2O, reduces NAD
+
oxidizes H2O, reduces NADP
oxidizes O2, reduces FAD
oxidizes H2O, reduces FAD
none of the above are true
2) Which of the following statements about the Oxygen Evolving Center (OEC) is false?
A)
B)
C)
D)
E)
It is located at lumen side (P-side) of the Thylakoid membrane.
It is identical to the OEC in mitochondria.
It contains Mn4CaO4.
Part of the cluster is liganded to the amino acids.
Only one of the two conserved Tyr is active.
3) The activated electrons from PSI in plants do have two possible functions:
A)
B)
C)
D)
E)
reduction of NAD+ or NADP+.
formation of ATP or entry in the citric acid cycle.
reduction of NADP+ or formation of a proton gradient.
reduction of NAD+ or formation of an ionic gradient.
none of the above
4) Absorption of light energy in chloroplast’s “light reactions” leads to:
A)
B)
C)
D)
E)
absorption of CO2 and release of O2.
absorption of O2 and release of CO2.
hydrolysis of ATP and reduction of NADP+.
synthesis of ATP and oxidation of NADPH.
use of iron-sulfur proteins.
5) In plants two reaction centers are organized in the so-called “Z-scheme”. Provide the
coefficients (a,b,c,d,e) for the overall reaction of electron extraction from water (given
below) occurring in these plants.
a H2O + b NADP+ + c hv → O2 + d NADPH + e H+
A)
B)
C)
D)
E)
1,1,1,1,1
2,2,2,8,2
2,2,8,1,1
1,1,2,2,2
2,2,8,2,2
Biochemistry 3300
Quiz 9
Instructor: Dr. H.-J. Wieden
2009-Apr-2
10:50 – 11:05
Name:_____________________ ID#:__________________
Page:2/2
6) In the Calvin cycle, ______ is “fixed” to generate carbohydrate molecules.
A)
B)
C)
D)
E)
NADH
H 2O
CO2
GDP
N2
7) ATP is synthesized in chloroplasts by a large complex with the two functional
components. What are these functional components?
A)
B)
C)
D)
E)
V 1V O
CF1CFO
WD40
C 3P O
F 1F O
8) The prcess during photosynthesis that results in the formation of ATP in e.g. chloroplasts
is called:
A)
B)
C)
D)
E)
Photophosphrylation
Oxidativ phosphorylation
Substratelevel phosphorylation
OxPhos
Photorespiration
9) The PSI reactive reaction center is most similar to the single reactive reaction center of :
A)
B)
C)
D)
E)
Green algae
Cyanobacteria
green sulfur bacteria
brown algae
purple bacteria
10) The activated electrons from PSI have two possible fates
functions:
A)
B)
C)
D)
E)
reduction of NAD+ or NADP+.
formation of ATP or entry in the citric acid cycle.
formation of a proton gradient.
reduction of NAD+ or formation of an ionic gradient.
none of the above