Practice Quiz 9 (Photosynthesis)
You have 25 minutes to finish the quiz.
Q.1:
A molecule has an absorption spectrum that shows maximum absorption within the wavelength of red light
this molecule is a reducing agent.
this molecule is an oxidizing agent.
a solution of these molecules absorbs green light
a solution of these molecules reflects red light
a solution of these molecules will not have a red color
Q.2:
Which statement is correct ?
excited chlorophyll releases its energy in form of heat
excited chlorophyll releases its energy in form of green light
excited chlorophyll can donate an electron to an oxidized electron carrier
chlorophyll absorbs light in the green wavelengths
Q.3:
Which statement is correct ?
the dark reaction in photosynthesis occurs mostly during the night
RuBP - carboxylase is activated by light
dark and light reactions do not occur at the same time
the fixation of CO2 to RbBP does not require light
all are incorrect
Q.4:
Labeled oxygen, (O-18)
2
is released from a green plant under the following conditions:
labeled C(O-18)2 is the only source of carbon for the plant
the plant has taken takes up (O-18)2
the plant is supplied with H2(O-18)
the plant can not use C(O-18)2 only CO2 containg the natural occuring O-16 isotope
Q.5 :
The following pairs represent structures or compounds in the mitochondria and chloroplasts with similar function
except
:
cristae .........inside the thylakoids
matrix ......... stroma
oxygen in mitochondria ...... oxygen in chloroplasts
ATPase in mitochondria ........ ATPase in chloroplasts
water ....... NADH
Q.6 :
chlorophyll and carotenoids
are pigments which are dissolved in the stroma of chloroplast to better absorb light energy
are pigments which emit mostly green light
are parts of a photosystem which absorbs mostly green light
absorb light energy, ultimately resulting in the removal of electrons from water.
Q.7 :
Which process does not require light directly ?
formation of ATP
a proton gradient across the thylakoid membrane is generated
ATP is consumed in by reactions in the stroma
water is oxidized to oxygen
Q.8 :
Which statement about chlorophyll is
not true
Photosystems are associated with large number of chlorophyll molecules
Excited chlorophyll molecules reduce plastoquinone (a compound of the electron transport chain)
chlorophyll contains magnesium
all are correct
Q.9 :
In cyclic phosphorylation
electrons are continuously removed from water to form oxygen
protons are moved across the thylakoid membrane using the same electrons
NADPH is continuously formed
ATP is continuously hydrolysed
Q.10 :
Which statement about proton migration during the light reaction is correct ?
protons are pumped into the stroma
protons are pumped into the thylakoids
similar to the mitochdria, proton pumping requires NADPH
protons return into the stroma passively via proton channels
Q.11 :
Which statement is false about the Calvin cycle ?
Oxygen is the preferred substrate for RuBP- carboxylase
all enzymes of the Calvin cycle are present in the stroma
RuBP- carboxylase requires ATP for the CO2 fixation step
the Calvin cycle does not require light energy
Q.12 :
All conditions must be present for the dark reaction
except
ribulose bisphosphate must be present
ATP and NADPH has to be present
PSI and PSII have to be operational
carbon dioxide has to be present
Q.13:
if green leaves are exposed to labeled carbon dioxide, C(O-18)
2
the O-18 shows up
first
in:
sucrose
ribulose bisphosphate
glucose
phosphoglycerate (3PG)
Q.14:
In C
4
plants
phosphoglycerate (3PG) is the first product in carbon fixation
RuBP carboxylase catalyzes the first step of carbon dioxide incorporation
carbon dioxide is added to phosphoenol pyruvate to form a C4-acid
C
4
plants don't use carbon dioxide as carbon source, they use malate instead
Q.15
Which statement is
false
for C
4
plants
phosphoenol pyruvate carboxylase has a very high affinity to carbon dioxide
C
4
plants do better in colder climates
C
4
plants have no photorespiration
consume more energy in carbon fixation
Q.16 :
Which statement about photorespiration is false ?
is prevelant in C
3
plants
is the oxidation of ribulose phosphate
oxygen, instead of carbon dioxide forms a complex with RuBP carboxylase
is the reaction of oxygen with glucose
Q.17 :
In bright light, the pH inside the thylakoids
becomes more alkaline
the pH inside the thylakoids does not change
becomes more acidic
changes from acidic to neutral
Q.18 :
Which statement is correct ?
photorespiration is a process by which photosynthetic compounds are used for energy production
Peroxisomes and mitochondria are involved in the processing of photorespiration products
photorespiration and mitochondrial respiration are similar
all are correct
Q.19 :
C4 plants
have no or only a few chloroplasts in their bundle sheath cells
carry out the Calvin cycle in their mesophyll cells
require one ATP for the initial carbon fixation step, whereas C3 plants do not
have two photosystems (PSI and PSII) in the chloroplasts of bundle sheath cells
Q.20 :
One advantage of C4 photosynthesis is that
its 4-carbon intermediates are closer to the final 6-carbon product (glucose)
it takes less solar energy to boost electrons so they can be added to NADP+
energetically more efficient ( less ATP needed to fix carbon)
provides a higher concentration of CO2 to the Calvin Cycle