Honors Biology – Photosynthesis Review Questions and Correct Answers
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Course
Honors Biology
Institution
Honors Biology
CO2, H2O Reactants of Photosynthesis
O2, C6H12O6 Products of Photosynthesis
Light Reactions, Calvin Cycle 2 stages of photosynthesis
Light energy bundled up as chemical energy in the form of ATP or NADPH Light Reactions
Chemical energy (ATP, NADPH) + CO2 form carbohydrates and oxygen Calvin Cyc...
Honors Biology – Photosynthesis
Review Questions and Correct Answers
CO2, H2O ✅Reactants of Photosynthesis
O2, C6H12O6 ✅Products of Photosynthesis
Light Reactions, Calvin Cycle ✅2 stages of photosynthesis
Light energy bundled up as chemical energy in the form of ATP or NADPH ✅Light
Reactions
Chemical energy (ATP, NADPH) + CO2 form carbohydrates and oxygen ✅Calvin
Cycle
Calvin Cycle ✅stage of photosynthesis that can occur without presence of light
Thylakoid ✅part of chloroplast Light Reactions take place in
Stroma ✅part of chloroplast Calvin Cycle takes place in
System of membranous sacs inside the inner membrane of the chloroplast ✅thylakoid
Stacks of thylakoids ✅grana
Solution surrounding the grana ✅stroma
Array of colors of sunlight ✅visible spectrum
Reflection, transmission, absorption ✅what three things can happen when white light
strikes an object?
A compound that absorbs light ✅pigment
Green pigment located in chloroplasts, giving plants their green color ✅chlorophyll
Pigment that absorbs mostly red light ✅chlorophyll a
Pigment that absorbs mostly blue light ✅chlorophyll b
Chlorophyll b, carotenoid ✅accessory pigments (2)
, Chlorophyll a ✅pigment that transfers excited electrons to the Primary electron
acceptor
Absorb light that neither chlorophyll can - greater absorption of colors from the visible
spectrum ✅purpose of carotenoids
Because chlorophyll is lost - the red and yellow colors are from carotenoids ✅in fall,
why do leaves appear red or yellow?
A cluster of proteins that contain photosynthetic pigments; embedded on the thylakoid
membrane ✅photosystem
Accessory pigments absorb light which is passed through molecules until it reaches a
specific pair of chlorophyll a molecules. ✅what is the preliminary step to
photosynthesis?
Light energy forces electrons to enter a higher energy level in 2 chlorophyll a molecules
of photosystem II. These excited electrons leave the chlorophyll a molecules. ✅what is
the first step to photosynthesis?
Excited electrons are accepted by an adjacent molecule in the thylakoid membrane
called the primary electron acceptor ✅what is the second step of photosynthesis?
The primary electron acceptor donates electrons to the first of a series of molecules
called the electron transport chain. As these electrons pass through molecules, they
lose most of their energy which is then used by the thylakoid to import H+ ions into the
cell ✅what is the third step of photosynthesis?
Light is absorbed by photosystem I and the same process occurs. The lost psi electrons
are replaced by the moving psii electrons. ✅what is the fourth step of photosynthesis?
In the stroma, electrons combine with an H+ ion and NADP+, which causes the
reduction (addition of an electron) of NADP+ to NADPH ✅what is the fifth and last step
of photosynthesis?
The splitting of water inside of the thylakoid ✅where do the replacement electrons for
photosystem II come from?
2(H2O) = 4(H+) + 4(e-) + O2 ✅what is the chemical formula for the splitting of water?
The synthesis of ATP ✅chemiosmosis
ATP synthase ✅enzyme responsible for chemiosmosis
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