Chapter 6: Where It Starts – Photosynthesis
1. Four of the five answers listed below are participants in photosynthesis. Select the exception.
A. Mitochondrion
B. Chloroplast
C. Thylakoid membrane
D. Chlorophyll
E. Photosystem
2. The enzyme rubisco:
A. Phosphorylates ADP
B. Acts as an organic source of carbon
C. Is a carbon-fixing enzyme
3. What accumulates inside the thylakoid compartment during light-dependent reactions:
A. Oxygen
B. Carbon dioxide
C. ATP
D. Glucose
E. Hydrogen ions
4. The enzyme rubisco attaches this to CO2:
A. RuBP
B. PGA
C. PGAL
D. Glucose
5. For each six atoms of carbon dioxide fixed in the light-independent reactions, how many
molecules of PGA are produced:
A. 6
B. 2
C. 12
D. 3
6. Longer wavelengths are:
A. Lower in energy and in the violet spectrum
B. Lower in energy and in the red spectrum
C. Higher in energy and in the red spectrum
7. The most common photosynthetic pigment in plants and Protist is:
A. Chlorophyll a
B. Chlorophyll b
C. Chlorophyll c
8. Twelve PGAL molecules form when six CO2 are attached to six RuBP molecules. Two of
these PGAL molecules are used to produce:
A. 2 CO2
B. 6 RuBP
C. 1 Glucose
D. 12 PGA
9. Label 1:
A. Inner membrane
B. Outer membrane
C. Thylakoid membrane
10. Label 2:
A. Intermembrane space
B. Thylakoid space
C. Stroma
11. Label 3:
A. Intermembrane space
B. Thylakoid space
C. Stroma
1
3
2
12. Which one of these molecules is in their reduced form:
A. NADPH
B. ADP
13. Four of the five answers listed below are processes associated with light-dependent reactions.
Select the exception:
A. Noncyclic pathways of ATP formation
B. Photolysis
C. Carbon fixation
D. Photosystems I and II
E. Electron transport phsophorylation
14. C4 plants use this molecule to produce CO2 in the bundle sheath cells:
A. Glucose
B. ATP
C. Malate
15. When a C3 plant closes stomata during the day, the plant:
A. Degrades excess rubisco
B. Loses carbon
C. Shifts to oxidation phosphorylation
16. PEP carboxylase is different from rubisco because:
A. PEP carboxylase is used in light-independent reactions and rubisco is used in lightdependent reactions
B. PEP carboxylase uses oxygen as a substrate and rubisco can use both oxygen and
carbon dioxide as a substrate
B. PEP carboxylase is involved in carbon fixation and rubisco is not
17. Autotrophs are organism that are:
A. Consumers that obtain carbon from inorganic molecules
B. Producers that obtain carbon from either inorganic or organic molecules
C. Producers that obtain carbon from inorganic molecules
D. Consumers that break down carbon from organic molecules
18. Electrons lost by chlorophyll are replaced by electrons donated from:
A. Carbon dioxide
B. Water
C. NADPH
19. Why do we perceive chlorophyll as a color green:
A. It reflects green light
B. It absorbs green light
C. It absorbs blue and yellow light
20. The H+ gradient facilitates the formation of ATP by:
A. Providing energy to fuel the ATP synthase
B. Directly phosphorylating ADP
C. Actin as an electron acceptor
21. What happens when a photosystem absorbs energy:
A. Electrons are synthesized
B. Electrons are ejected
C. Electrons are absorbed
22. The electrons that are passed to NADP+ during noncyclic pathways are emitted by:
A. Glucose
B. Sunlight
C. Photosystem I
D. Photosystem II
23. The process by which photosystem II pulls electrons off of water molecules, causing water to
split into hydrogen ions and oxygen atoms, is know as:
A. Hydrolysis
B. Electrolysis
C. Photolysis
24. The process of carbon fixation involves:
A. Extracting carbon atoms from an organic source and incorporating them into an
inorganic molecule
B. Extracting carbon atom from an inorganic source and incorporating them into
organic molecule
C. Forming ionic bonds between carbon atoms in inorganic molecules
25. The transport of what molecules or particles across the thylakoid membrane power the
production of ATP:
A. Phosphate ions
B. Oxygen
C. Carbon dioxide
D. Hydrogen ions
26. A pigment is an organic molecule that:
A. Breaks down light
B. Protects plants from light
C. Selectively absorbs light
27. Light-independent photosynthetic reactions result in the generation of:
A. ADP, NADP+ and H2O
B. ATP, NADPH and H2O
C. ADP, NADP+ and sugars
28. The enzyme mediated reaction of the Calvin-Benson cycle:
A. Generate ATP and build sugars
B. Build sugars
C. Generates ATP
29. Which type of plants are best adapted to hot, dry conditions:
A. C3 plants
B. C4 plants
C. CAM plant
30. Light-dependent photosynthetic reactions take place in the:
A. Cell wall
B. Stroma
C. Mitochondria
D. Thylakoid membrane
31. Opening in leaves through which gases enter and exit are called:
A. Rubiscos
B. Stomata
C. Mesophyll
32. Plants need which molecules to carry out photosynthesis:
A. Both CO2 and H2O
B. CO2 only
C. Both CO2 and O2
33. In the cyclic pathway electrons ejected from photosystem I return to:
A. The stroma
B. Photosystem II
C. Photosystem I
D. ATP synthase
34. Why would a photosynthetic organism have more than one type of pigment within their cell:
A. To direct light toward the primary pigment
B. To provide structural support for the primary pigment
C. To optimize the amount of energy that can be harvest in specific environments
D. To allow photosynthesis to occur at any time of the day
35. How are the ATP and NADPH molecules (made during the light-dependent reactions) used in
the conversion of PGA to PGAL in the Calvin Benson cycle:
A. ATP provides a carbon source and NADPH donates hydrogen
B. ATP and NADPH both donate phosphate groups
C. ATP donates a phosphate group and NADPH provides a carbon source
D. ATP donates a phosphate group and NADPH donates hydrogen
E. ATP provides electrons and NADPH provides a phosphate group
36. The first event in photosynthesis is the:
A. Fixation of carbon dioxide
B. Movement of hydrogen ions through ATP synthases
C. Donation of electrons from a photosystem to an electron transfer chain
D. Formation of PGAL
37. Twelve PGAL molecules form when six CO2 are attached to six RuBP molecules. Ten of
these PGAL molecules are used to produced:
A. 2 CO2
B. 6 RuBP
C. 1 Glucose
D. 12 PGA
38. Which light-dependent photosynthetic pathway results in the generation of only ATP:
A. Type II pathway
B. Noncyclic pathway
C. Cyclic pathway
39. Light-independent photosynthetic reactions take place in the:
A. Cell wall
B. Stroma
C. Mitochondria
D. Thylakoid membrane
40. Discrete packages of light energy are called:
A. Electromagnetic particles
B. Radioactive wave
C. Photon