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Quiz – Photosynthesis C4
A. chlorophyll
B. chloroplast
C. stroma
D. thylakoid membranes
E. light-dependent reaction
F. light-independent reaction
G. ATP
H. carbon dioxide
I. electrons
J. NADPH
K. oxygen
L. sunlight
M. first electron transport chain
N. second electron transport chain
P. chemical bonds
Q. photolysis/ chemiosmosis
R. Calvin cycle
S. glucose
T. G3P
From the list above, fill in the blanks.
In photosynthesis the ultimate source of energy is __L__. This form of energy hits the plant
leaves and activates the substance __A__which is the pigment responsible for the green color of those
leaves. This reaction occurs in the __B__, the plant organelle responsible for providing energy in plant
cells. Within this structure are stacks of __D__ that make up the granum. Chlorophyll is located within it.
When the sun’s energy strikes the chlorophyll, the chlorophyll’s __I__ are activated. Rather than be lost
to the atmosphere, the plant cell captures this energy and transports it via a series of proteins embedded in
the thylakoid membranes. These proteins are collectively called the __M__. As the energized electrons
are passed along, some of the energy is used to make __G__. This molecule is the most accessible source
of energy used by cell organelles to do work. The cell has used not all of the energy in the activated
electrons, and so the electrons are passed down the __N__. Following this, there is still plenty of energy
left to utilize! The cell’s motto is “Waste not, want not,” and so it carries the electron via NADP+ to the
__C__ of the chloroplast. NADP+ picks up a proton to become NADPH as it is carrying the electron.
During photosynthesis the activated electrons from the _E/A___ carry the energy from the sun to produce
2 high-energy molecules. The electrons, however, are not infinite, and therefore need to be replaced. In
order to do this, water molecules are cleaved by the sunlight in a process called _Q___. In addition to
producing 2 hydrogen atoms and 2 more electrons, __K___ is also produced. Therefore, with free energy
from the sun and water from the air, plant cells can capture energy in the __P__ of ATP and NADPH.
This concludes the first part of photosynthesis called the __E__.
Following this, the plant cell uses these energy molecules in the second phase, or the __F__.
During this part of photosynthesis, which occurs in the stroma of the chloroplast, the cell uses __H__
from the air to fix a carbon molecule onto ribulose biphosphate in the __R___. Two molecules of __G__
and one molecule of __J__ are used for each round of synthesis. After 6 such rounds, 2 molecules of
__T___are produced. One is recycled to form RuBP and the other is transported to the cytosol where it
will be used to make _S__.