Deck 7: Biochemical Pathways: Photosynthesis

Question 1

Energy gathering or concentrating mechanisms that allow light to be collected more efficiently during photosynthesis are called

A) mitochondria.
B) photosystems.
C) light-independent reactions.
D) ribulose.

Answer 1

photosystems.

Question 2

The ATP and NADPH produced in the light-dependent reaction stage

A) become reactants for cellular respiration.
B) are waste products that the plant eliminates.
C) become the raw materials for the light-independent reaction stage.
D) are the end products of photosynthesis.

Answer 2

become the raw materials for the light-independent reaction stage.

Question 3

A correct equation for photosynthesis is

A) SUN + 6O₂ + 6CO₂ $\rightarrow$ C₆H₁₂O₆ + 6H₂O.
B) SUN + C₆H₁₂O₆ + 6O₂ $\rightarrow$ 6CO₂ + 6H₂O.
C) SUN + 6CO₂ + 6H₂O $\rightarrow$ C₆H₁₂O₆ + 6O₂.
D) SUN + 6CO₂ $\rightarrow$ 6H₂O + C₆H₁₂O₆ + 6O₂.

Answer 3

SUN + 6CO₂ + 6H₂O $\rightarrow$ C₆H₁₂O₆ + 6O₂.

Question 4

The molecule that traps the sun's energy is

A) ATP.
B) glyceraldehyde-3-phosphate.
C) chloroplast.
D) chlorophyll.

Question 5

O₂ is a product of the

A) light-dependent reactions.
B) light-independent reactions.
C) light-capturing events
D) All of the choices are correct.

Question 6

Glyceraldehyde-3-phosphate is an end product of

A) light-dependent reactions.
B) light-independent reactions.
C) glycolysis.
D) the electron transport system.

Question 7

The production of ATP occurs

A) as hydrogen ions move across membranes.
B) in chloroplasts.
C) in mitochondria.
D) in all of the choices listed.

Question 8

During the light-independent reactions of photosynthesis,

A) glyceraldehyde-3-phosphate is produced.
B) ADP is produced.
C) NADP⁺ is produced.
D) All of the choices are correct.

Question 9

In photosynthesis C3, plants differ from C4 plants in

A) the way they capture light.
B) the way they capture carbon dioxide.
C) the kind of chlorophylls they have.
D) None of the choices is correct.

Question 10

Which of the following kinds of organisms can manufacture the greatest variety of organic compounds?

A) aerobic bacteria
B) anaerobic bacteria
C) animals
D) plants

Question 11

Crassulacean acid metabolism (CAM) is a form of photosynthesis that

A) encourages the light-independent reactions to take place at night.
B) allows photosynthesis to take place without water.
C) encourages the light-dependent reactions to take place at night.
D) allows photosynthesis to take place without carbon dioxide.

Question 12

The light-independent reactions of photosynthesis (Calvin cycle) take place in the

A) thylakoids.
B) cytoplasm.
C) grana.
D) stroma.

Question 13

The light-capturing events of photosynthesis involve

A) the stroma.
B) mitochondria
C) cytoplasm.
D) chlorophyll.

Question 14

This portion of photosynthesis is a series of oxidation-reduction reactions during which light energy is transferred to electrons so that the electrons move more rapidly.

A) light-dependent reactions
B) proton pump
C) light capturing events
D) light-independent reactions

Question 15

ATP, NADPH, CO₂, and a five-carbon starter molecule called ribulose are needed for the _____________________ of photosynthesis to occur.

A) light-dependent reactions
B) light-independent reactions
C) light-capturing events
D) All of the choices are correct.

Question 16

Almost 80% of this molecule is used to regenerate ribulose so that photosynthesis can continue. The remaining 20% is used by the plant to make other organic molecules.

A) pyruvic acid
B) acetyl CoA
C) glyceraldehyde-3-phosphate
D) glucose

Question 17

____ is NOT part of photosynthesis.

A) Trapping the sun's energy
B) Converting glyceraldehyde-3-phosphate into usable energy
C) Splitting water molecules
D) Bonding carbon dioxide to ribulose

Question 18

Water molecules are a reactant for

A) the electron transport system.
B) the light-independent reactions.
C) the light-dependent reactions.
D) glycolysis.

Question 19

____ take(s) place within the grana.

A) The light-dependent reactions
B) The light-independent reactions
C) The entire photosynthesis process
D) Aerobic cellular respiration

Question 20

Glyceraldehyde-3-phosphate can do all of the following except

A) be converted to usable energy for the cell.
B) manufacture lipids.
C) produce trace elements required for plant growth (nitrogen, magnesium, phosphorus, etc.).
D) be converted to ribulose.

Question 21

The oxygen produced by a plant comes most directly from

A) CO₂.
B) H₂O.
C) C₆H₁₂O₆.
D) glyceraldehyde-3-phosphate.

Question 22

____ is NOT needed for the light-dependent reactions.

A) NADP
B) ADP + P
C) H₂O
D) CO₂

Question 23

Two products of the light-dependent reactions, which become reactants for the light-independent reactions, are

A) ATP and NADP.
B) CO₂ and H₂O.
C) O₂ and ATP.
D) ATP and NADPH₂.

Question 24

The process of photosynthesis requires the raw materials

A) O₂ and H₂O.
B) CO₂ and H₂O.
C) sugar and CO₂.
D) H₂O and sugar.

Question 25

For the light-independent reactions to continue, glyceraldehyde-3-phosphate must be converted into

A) ribulose.
B) carbon dioxide.
C) ATP.
D) glucose.

Question 26

Which one of the following is NOT required for photosynthesis to take place?

A) enzymes
B) ATP
C) oxygen
D) carbon dioxide

Question 27

Photosynthesis takes place in

A) both plants and animals.
B) animals but not plants.
C) plants but not animals.
D) bacteria only.

Question 28

Which of the following tests would be the best for determining if a cell were carrying on photosynthesis?

A) Does the cell contain water?
B) Does the cell produce carbon dioxide?
C) Does the cell release oxygen?
D) Does the cell require oxygen to stay alive?

Question 29

Which is a general equation that summarizes the light-dependent reactions?

A) excited electrons + H₂O + ADP + NADP⁺ $\rightarrow$ ATP + NADPH + O₂
B) ATP + NADPH + ribulose + CO₂ $\rightarrow$ ADP + NADP⁺ + complex organic molecule + ribulose
C) CO₂ + ATP + NADH + 5-ribulose $\rightarrow$ glyceraldehyde-3-phosphate + NADP⁺ + ADP + P
D) SUN + 6CO₂ $\rightarrow$ 6H₂O + C₆H₁₂O₆ + 6O₂

Question 30

Which does NOT occur in the light-independent reactions?

A) The 6-carbon molecule immediately divides into two 3-carbon molecules of glyceraldehyde-3-phosphate.
B) Hydrogens from NADPH are transferred to molecules in the Calvin cycle.
C) The 5-carbon ribulose is regenerated.
D) ADP and NAD⁺ are returned to the light-dependent reactions.

Question 31

This form of photosynthesis allows photosynthesis to occur in arid environments while reducing the potential for water loss.

A) Calvin cycle
B) Crassulacean acid metabolism
C) photon cycle
D) hydrologic cycle

Question 32

Foxglove produces this valuable medicine used in the treatment of heart disease. The drug containing this compound is known as

A) digitalis.
B) aspirin.
C) acetaminophen.
D) morphine.

Question 33

During their life spans, green plants give off more oxygen to the atmosphere than they take in for use in

A) fat metabolism.
B) respiration.
C) the Krebs cycle.
D) the Calvin cycle.

Question 34

These reactions take place in the stroma in either the light or dark as long as ATP and NADPH are available.

A) light capturing events
B) light-dependent reactions
C) light-independent
D) Calvin cycle

Question 35

Which is used in photosynthesis but not in cellular respiration?

A) NAD⁺
B) FAD
C) cytochromes
D) NADP⁺

Question 36

Reaction centers are located in the

A) grana.
B) thylakoid.
C) antenna complex.
D) All of the choices are correct.

Question 37

The light energy trapped by the antenna complex is used to

A) split water into H and O.
B) produce CO₂.
C) generate ribulose.
D) All of the choices are correct.

Question 38

Carbon fixation begins with carbon dioxide combining with a 5-carbon molecule,

A) glucose.
B) ribulose.
C) NADP⁺
D) glyceraldehyde-3-phosphate.

Question 39

Proton pumps are used in photosynthesis

A) to pump protons into the thylakoid.
B) between photosystem II and photosystem I.
C) during the light-dependent reaction sequence.
D) All of the choices are correct.

Question 40

Which wavelengths of light are most likely to be absorbed by chlorophyll a?

A) UV
B) blue
C) red
D) infrared

Question 41

Which wavelengths of light are most likely to be absorbed by chlorophyll b?

A) UV
B) blue
C) red
D) infrared

Question 42

Thylakoids are found in

A) chloroplasts
B) mitochondria
C) liver cells
D) fungal cells

Question 43

It is assumed that the chloroplasts of eukaryotes are evolved from

A) animal cells.
B) photosynthetic bacteria.
C) algal cells.
D) fungal cells.

Question 44

In this kind of photosynthesis, carbon dioxide does not directly enter the Calvin cycle but is carried out in two steps and two different kinds of cells.

A) crassulacean acid metabolism
B) C3
C) C4
D) C5

Question 45

Keeping a plant under green light will

A) result in its death.
B) increase the rate of photosynthesis.
C) cause it to lose its accessory pigments.
D) cause it to set flowers.

Question 46

Protons are pumped in which stage of photosynthesis?

A) light-capturing
B) light-dependent reactions
C) light-independent reactions
D) glycolysis

Question 47

Ultimately all organisms are dependant on photosynthesis for their food.

Question 48

Recent scientific data shows that an increase in atmospheric carbon dioxide levels leads to an increase in photosynthesis and therefore an increase in food production.

Question 49

Being very specific, the actual end product of photosynthesis is RuBisCO.