Biology-Chapter 8

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The following diagram represents light absorption as a function of wavelength of various pigments. The pigment represented by the dotted line will absorb most strongly light with which of the following wavelengths?

470 nm

Which of the following are parts of a chlorophyll molecule?

A hydrocarbon tail,A porphyrin ring

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

Compared to the C3 pathway, the C4 pathway has an additional cost to a plant, because

ATP is required to convert pyruvate to PEP

Which of the following organisms have only one photosystem?

Anoxygenic bacteria

Why is the Calvin cycle also known as C3 photosynthesis?

Because the first molecule in the cycle has 3 carbon atoms.

avoid water loss by closing their stomata during the day and opening them at night

CAM

How do CAM plants avoid water loss?

CAM plants close their stomata during the day and open them at night.

Chlorophyll___is the main photosynthetic pigment in plants as it converts light energy into chemical energy; chlorophyll___acts as an accessory pigment.

Chlorophyll a, Chlorophyll b.

Which of the following pairs is matched incorrectly?

Chlorophyll b:main photosynthetic pigment in plants.

True or false: The mechanism of ATP synthesis in the ATP synthase of chloroplasts is fundamentally different from the one used in the ATP synthase of mitochondria.

False

Which of the following is made during the light-dependent stages of photosynthesis?

NADPH

The production of one molecule of__from water during photosynthesis requires several thousand chlorophyll molecules.

O2

The primary electron acceptor for the excited electron leaving photosystem II is a___molecule.

Plastoquinone

Which of the following are phases of the Calvin cycle?

Reduction and carbohydrate production,Carbon fixation,Regeneration of ribulose bisphosphate

The following diagram represents light absorption as a function of wavelength of various pigments. Which of the three pigments might reflect a yellow or red color

The pigment represented by the gray line

Typically, it is considered that the net gain of the Calvin cycle is(are) ___molecule(s) of G3P.

Two

Light has properties of both a particle and a wave.

Which of the following statements best describes the properties of light?

The __ diagram describes the energy transitions of electrons as they move through the __ reactions.

Z ; light

A photon of light has properties of both

a particle and a wave.

The ATP needed in the Calvin cycle comes from

both cyclic and noncyclic photophosphorylation

The dotted line on the image shows the absorption spectrum of

chlorophyll b

The light___ reactions of photosynthesis occur on membranes.

dependent

The role of the light-harvesting complex is to

directly absorb photons of light

The ATP synthases of chloroplasts and mitochondria are

evolutionary related

True or false: Glucose is the primary output of the Calvin cycle.

false

The role of the___Unavailable-harvesting complex is to directly absorb photons of light.

light

The process in which electrons from water move through PSII and PSI and ultimately to NADPH is also known as___photophosphorylation.

noncyclic

In chloroplasts, electrons ejected from the photosystems do not return to them, which is known as

noncyclic photophosphorylation.

Anoxygenic bacteria have how many photosystems?

one

In chloroplasts, several dozen of these kinds of molecules help comprise a light harvesting complex:

pigments

Recent studies with the atomic force microscope have shown that PSI and the ATP synthase are not randomly distributed in thylakoid membranes, rather, they seem concentrated

primarily in the connections between grana (the stroma lamellae).

The range and efficiency of photons that a pigment molecule is capable of absorbing constitute its characteristic absorption

spectrum

Reduced quinone is a

strong electron donor.

The function of the b6-f complex is to pump protons into the___space.

thylakoid

A Z diagram illustrates how many electron-energizing steps?

two

Which of the following represent the phases of the Calvin cycle?

(1) carbon fixation; (2) reduction and carbohydrate production; (3) regeneration of ribulose bisphosphate

According to recent studies, where are PSII and the b6-f complexes located?

In the grana and in borders between the grana and the stroma lamellae

Where do the light-dependent reactions of photosynthesis occur in the chloroplast?

In the thylakoid membrane.

A C3 plant

can only fix carbon using the Calvin cycle

The solid gray line on the image shows the absorption spectrum of

carotenoids

The two most important classes of pigments in chloroplasts are chlorophylls and

carotenoids

Green plants utilize___a and b to absorb light energy in photosynthesis.

chlorophyll

In chloroplasts, the light-harvesting complex is composed of a web of___molecules linked together and held tightly in the thylakoid membrane by a matrix of proteins.

chlorophyll


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