Colors of light most useful in photosynthesis are

A)green, yellow, and orange

B)red, violet, and blue

C)infrared, red, and yellow

D)red, white, and blue

B

During what stage of photosynthesis is O₂ produced?

A)cyclic photophosphorylation

B)the light-dependent reactions involving photosystems I and II

C)carbon fixation

D)the Krebs cycle

E)O₂ is not produced during photosynthesis

B

The pigment molecules responsible for photosynthesis are located in the

A)mitochondria

B)cytoplasm of the cell

C)stroma of the chloroplast

D)thylakoid membrane of the chloroplast

E)all of the above

D

Both carotenoids and chlorophylls

A)are pigments

B)absorb photons of all energy ranges

C)contain porphyrin rings

D)all of the above

E)none of the above

A

Which of the following is the correct sequence for the movement of electrons during the light-dependent reactions of plants?

A)P₆₈₀ à P₇₀₀ à water à NADP⁺

B)water à P₇₀₀ à NADP⁺à P₆₈₀

C)P₇₀₀ à P₆₈₀ à NADP⁺à water

D)P₆₈₀ à water à P₇₀₀ à NADP⁺

E)water à P₆₈₀ à P₇₀₀ à NADP⁺

E

What pigment is used in human vision?

A)chlorophyll a

B)beta-carotene

C)retinal

D)vitamin A

E)ferredoxin

C

During what stage of photosynthesis are ATP and NADPH converted to ADP + Pi and NADP⁺?

A)the light-dependent reactions

B)the light-independent reactions

C)both of the above

D)none of the above

B

Water vapor exits and CO₂ enters a leaf through the

A)stomata

B)grana

C)porphyrin rings

D)photons

E)stroma

A

Which of the following organisms have the greatest problem with photorespiration?

A)C4 plants

B)heterotrophs

C)C3 plants

D)CAM plants

E)purple sulfur bacteria

C

What energy-rich organic compound is produced as a result of the Calvin cycle?

A)NADPH

B)CO₂

C)ATP

D)H₂O

E)glucose

E

High-energy photons

A)have long wavelengths

B)have short wavelengths

C)are more likely to produce red light than blue light

D)cannot be absorbed

B

Light that is visible to humans occupies what part of the electromagnetic spectrum?

A)the entire upper half

B)the entire lower half

C)a small portion in the middle

D)the entire spectrum

E)visible light is not part of the electromagnetic spectrum

C

During photosynthesis, photons raise electrons to higher energy levels. These excited electrons belong to what compound?A)H₂OB)ATPC)RuBPD)glucoseE)chlorophyll

E

Which of the following occurs during the light-dependent reactions of plants?

A)electron transport

B)chemiosmosis

C)splitting of water

D)all of the above

E)none of the above

D

The oxygen that is released as O₂ during photosynthesis came from _____________ molecules.

A)carbon dioxide

B)water

C)glucose

D)chlorophyll

E)ATP

B

Compared to retinal, chlorophyll can be described as a pigment that has a

A)narrow absorption range but high efficiency

B)narrow absorption range but low efficiency

C)wide absorption range but high efficiency

D)wide absorption range but low efficiency

A

The earliest photosynthesizers probably used what as a source of hydrogen?

A)H₂S

B)H₂O

C)CO₂

D)C₆H₁₂O₆

A

How many carbon atoms are in a molecule of RuBP?

A)zero

B)one

C )two

D)three

E)five

E

Which of the following is mismatched?

A)Photosystem I - uses the P700 molecule in its photocenter

B)PGA - a 3-carbon compound

C)antenna complex - contains hundreds of pigment molecules

D)CAM plants - open their stomata during the day and close them at night to avoid photorespiration

E)C₄ plants - expend ATP to concentrate CO₂ in bundle-sheath cells to avoid photorespiration

D

Which of the following statements about photosynthesis is true?

A)the light-dependent reactions can occur only in the light, the light-independent reactions only in the dark

B)photorespiration is more efficient at producing glucose than is photosynthesis

C)the light-dependent reactions produce the energy-rich compounds that are used to run the light-independent reactions

D)all of the above are true

B

In sulfur bacteria, how many pigment electrons must get transported during cyclic photophosphorylation to produce one molecule of ATP?``

A)one

B)two

C)three

D)four

E)five

C

Production of one molecule of 3-phosphoglyceraldehyde requires how many turns of the Calvin cycle?

A)1

B)2

C)3

D)6

E)12

C

To reduce six molecules of carbon dioxide to glucose via photosynthesis, how many molecules of NADPH and ATP are required?

A)6 NADPH and 6 ATP

B)12 NADPH and 12 ATP

C)12 NADPH and 18 ATP

D)18 NADPH and 12 ATP

E)24 NADPH and 18 ATP

C

The primary form of sugar transported from the site of photosynthesis to the rest of the plant is:

A)glyceraldehyde 3-phosphate

B)glucose

C)fructose

D)ribulose 1,5-bisphosphate

E)sucrose

E

Rubisco:

A)catalyzes the carboxylation of CO₂ to ribulose 1,5-bisphosphate.

B)initiates photorespiration when the CO₂/O₂ ratio is low.

C)catalyzes the reduction of two molecules of PGAL to form glucose.

D)all of the above (a-c).

E)a and b, but not c.

E

The immediate products of C₃ and C₄ photosynthesis are, respectfully:

A)ribulose 1,5-bisphosphate; malic acid

B)malate; carbon dioxide

C)3-phosphoglycerate; oxaloacetic acidD)glyceraldehyde 3-phosphate; phospho-enol-pyruvate (PEP)

E)malic acid; glucose

C

Light-driven electron transport in the chloroplast pumps H⁺ into the intermembrane space between the outer and inner membranes

.A)True

B )False

B

CO₂ fixation occurs within the stroma.

A)True

B)False

A

If you know the absorption spectrum of a pigment, you can predict the pigment's color.

A)True

B)False

A

For every CO₂ molecule fixed by photosynthesis, one molecule of O₂ is produced.

A)True

B)False

A

Light is required for the light dependent reactions because

A)it is the source for electrons

B)it splits the water molecule

C)it energizes electrons in the reaction center

D)it splits ATP molecules which generates the energy necessary to power the light independent reactions

E)none of the above

C