Chapter 8 Week 6 Questions
Place the four stages of the thylakoid reactions in the correct order starting with the first stage at the top.
Primary Photoevent Charge Seperation Electron Transport Chemiomosis
Which are the two main forms of photosynthesis?
anoxygenic and oxygenic
The ATP needed in the Calvin cycle comes from
both cyclic and noncyclic photophosphorylation
The first stage of photosynthesis is
capturing energy from sunlight
First stage of photosynthesis is
capturing light
In photosynthesis, glucose is produced via the reduction of which of the following?
carbon dioxide
The formation of organic molecules from carbon dioxide is called
carbon fixation
The Calvin cycle begins with
carbon fixation using Rubisco
The first two stages of photosynthesis require light and are commonly known as the light- ______ reactions.
dependent
The third stage of photosynthesis is also called carbon
fixation
The G3P produced during the Calvin cycle is transported into the cytoplasm where it is usually converted into ____ 6 phosphate and ____ 1-phosphate
fructose, glucose
In a leaf, the thick layer of cells that are rich in chloroplasts is called the
mesophyll
Photosynthetic pigments in the chloroplast are organized into distinct clusters known as
photosystems
Pigment molecules capturing photons in the chloroplast are organized in distinct structures called
photosystems
The energy used by most living cells comes ultimately from the _____ and is captured through the process of ______.
sun, photosynthesis
The inner (internal) membrane of the chloroplast is also called the _____ membrane.
thylakoid
_____ molecules of G3P made during the Calvin cycle can be used to make one molecule of ______
two, glucose
Why is the Calvin cycle also known as C3 photosynthesis?
Because the first molecule in the cycle has 3 carbon atoms.
Which of the following is made during the light-dependent stages of photosynthesis?
NADPH
Photosystem I contains the pigment
P700
The first stage of the thylakoid (or light-dependent) reactions is the
primary photoevent
Consider the net equation that describes the Calvin cycle. How many NADPH are needed to synthesize the two net G3P molecules that can be used to make a glucose molecule?
12
When you take into account the net equation of the Calvin cycle, how many ATP molecules are needed to synthesize two G3P molecules?
18
How many molecules of CO2 need to be bound to molecules of RuBP to produce 12 molecules of PGA in the Calvin cycle?
6
Which of the following are the three stages of photosynthesis in plants?
Capturing energy from the sunlight Using ATP and NADPH to produce organic compounds from CO2 Making ATP and NADPH
Where do the light-dependent reactions of photosynthesis occur in the chloroplast?
In the thylakoid membrane.
How do plants benefit from having two linked photosystems?
It allows them to use electrons from water to reduce NADP+.
Photophosphorylation produces _____ which stores chemical energy that can be used for the Calvin cycle. Carbon fixation also requires reducing power, which is provided by ______ produced by photosystem I.
ATP NADPH
What occurs during the charge separation stage of the thylakoid reactions?
An excited electron is transferred to an acceptor molecule.
The Calvin cycle is also known as ____ photosynthesis because the first intermediate of the cycle contains three carbon atoms.
C3
In photosynthesis, glucose is produced via the reduction of which of the following?
Carbon dioxide
Oxygenic photosynthesis is carried out by which of the following organisms?
Cyanobacteria
True or false: Glucose is the primary output of the Calvin cycle.
False
Which of the following (choose all that apply) are necessary for carbon fixation in the Calvin cycle?
NADPH ATP
Which of the following is associated with the reaction center of PS II?
P680
What is ultimately the main source of energy for almost all living cells on Earth?
Sun
The third and final stage of photosynthesis is also known as which of the following?
The light-independent reactions
The production of one molecule of O2 during photosynthesis requires how many chlorophyll molecules?
Thousands
What is the net gain of the Calvin cycle?
Two molecules of G3P
What occurs during the primary photoevent?
a photon is captured by a pigment in the photosystem
Which of the following is not part of chloroplasts?
cristae
Which of the following are parts of the chloroplast?
grana inner membrane thylakoids stroma
The production of one molecule of ____ from water during photosynthesis requires several thousand chlorophyll molecules.
oxygen
The production of one molecule of ______ from water during photosynthesis requires several thousand chlorophyll molecules
oxygen
During the primary photoevent, a(n) _____ of light is captured by a pigment.
photon
During photosynthesis, glucose is produced via the ___ of CO2
reduction
A leaf that appears to be green to the human eye contains pigment molecules that are
reflecting green light
When light strikes a pigment, some wavelengths are absorbed and some are reflected. For instance, a leaf that appears green to the eye _____ green wavelengths of light
reflects
What is the name of the enzyme that incorporates CO2 into organic matter during the Calvin cycle?
rubisco
During the light dependent reactions of photosynthesis, an excited electron is transferred from chlorophyll in the reaction center to an acceptor molecule; this stage in the thylakoid reactions is also known as charge _______.
separation
Where is rubisco located?
stroma of the chloroplast
Most plants transport the fixed carbon in the form of the transport sugar
sucrose
After it is transported into the cytoplasm, the G3P made during photosynthesis is usually used to synthesize fructose 6-phosphate and glucose 1-phosphate, which can be used to form _____
sucrose.
In a green plant, the majority of photosynthesis takes place in
the leaves
The internal membrane of the chloroplast is also known as
thylakoid membrane.
How many different types of photosystems are found in chloroplasts?
two
Having two different linked photosystems in chloroplasts overcomes the limitations of anoxygenic photosynthesis by allowing the oxidation of _____.
water
Having two different linked photosystems in chloroplasts overcomes the limitations of anoxygenic photosynthesis by allowing the oxidation of _______.
water
Which of the following represent the phases of the Calvin cycle?
(1) carbon fixation; (2) reduction and carbohydrate production; (3) regeneration of ribulose bisphosphate
Which of the following is the primary output of the Calvin cycle?
G3P
