Ap Bio Photosynthesis Test

Front 1

Some photosynthetic bacteria (e.g. purple sulfur bacteria) have only photosystem 1, whereas others (e.g. cyanobacteria) have both photosystem 1 and photosystem 2. Which of the following might this observation imply?

Back 1

Photosynthesis with only photosystem 1 is more ancestral.

Front 2

Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?

Back 2

ATP and NADPH

Front 3

Photosynthesis is NOT responsible for

Back 3

fossil fuels

Front 4

Where does the Calvin cycle take place?

Back 4

stroma of the chloroplast

Front 5

In any ecosystem, terrstrial or aquatic, what group is always neccessary?

Back 5

autotrophs

Front 6

In autortrophic bacteria, where are the enzymes located that can carry on carbon fixation (reduction of carbon dioxide to carbohydrate)?

Back 6

In the cytosol

Front 7

When oxygen is released as a result of photosynthesis, it is a direct by-product of

Back 7

splitting water molecules

Front 8

A plant has a unique photosynthetic pigment. The leaves of this plant appear to be reddish yellow. What wavelengths of visible light are being absorbed by this pigment?

Back 8

blue and violet

Front 9

In the thylakoid membranes what is the main role of the antenna pigment molecules?

Back 9

Harvest photons and transfer light energy to the reaction-center chlorophyll

Front 10

Which of the events listed below occurs in the light reaction of photosynthesis?

Back 10

Light is absorbed and funneled to o reaction center chlorophyll-a

Front 11

Which statement describes the functioning of photosystem 2

Back 11

The p680 chlorophyll donates a pair of protons to NADP+ which is thus converted to NADPH

Front 12

Which of the following are directly associated with photosystem 1?

Back 12

Receiving electrons from the thylakoid membrane electron transport chain

Front 13

What are the products of linear photophosphorylation?

Back 13

ADP and NADP

Front 14

As a research scientist, you measure the amount of ATP and NADPH consumed by the Calvin cycle in 1 hour. You find 30,000 molecues of ATP consumed but only 20,000 molecules of NADPH. Where did the extra ATP molecules come from?

Back 14

Cyclic electron flow

Front 15

Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma. This damage will have the most direct effect on which of the following processes?

Back 15

The synthesis of ATP

Front 16

What does the chemiosmotic process in chloroplasts involve?

Back 16

Establishment of a proton gradient across the thylakoid membrane

Front 17

In a plant cell, where are the ATP synthase complexes located?

Back 17

Thylakoid membrane and inner mitchondrial membrane

Front 18

In mitochondria, cheiosmosis translocates protons from the matrix into the intermembrane space, whereas in chloroplasts, chemiosmosis translocates protons from

Back 18

the intermembrane space to the matrix

Front 19

Which of the following statements best describes the relationship between photosynthesis and respiration?

Back 19

Photosynthesis stores energy in complex organic molecules, whereas respiration releases it.

Front 20

Where are the molecules of the electron transport chain found in plant cells?

Back 20

Thylakoid membranes of chloroplasts

Front 21

Reduction of oxygen to form water occurs during

Back 21

respiration

Front 22

P680+ is said to be the strongest biological oxidizing agent. Why?

Back 22

This molecule has a stronger attraction for electrons than oxygen, to obtain electrons from water.

Front 23

Where do the enzymatic reactions of the Calvin cycle take place?

Back 23

Stroma of the chloroplast

Front 24

What is the primary function of the Calvin Cycle?

Back 24

Use ATP to release carbon dioxide

Front 25

The NADPH required for the Calvin cycle comes from

Back 25

reactions initiated in photosystem 1

Front 26

Reactions that require CO2 take place in

Back 26

The calvin cycle alone

Front 27

Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?

Back 27

The light reactions provide ATP and NADPH to the calvin cycle, and the cycle returns ADP, Pi, and NADP+ to the light reactions

Front 28

In the process of carbon fixation, RuBP attaches a CO2 to produce a six-carbon molecule, which is then split to produce two molecules of 3-phosphoglycerate. After phosphorylation and reduction produces glyceraldehyede 3-phosphaate (G3P), what more needs to happen to complete the Calvin cycle?

Back 28

Regeneration of RuBP

Front 29

Photorespiration occures when rubisco reacts RuBP with

Back 29

O2

Front 30

Why are C4 plants able to photosynthesize with no apparent photorespiration?

Back 30

They use PEP carboxylase to initially fix CO2

Front 31

CAM plants keep stomata closed in daytime thus reducing loss of water. They can do this because they

Back 31

fix CO2 into organic acids during the night

Front 32

Figure 10.1 shows the absorbtion spectrum for chlorophyll A and the action spectrum for photosynthesis. Why are they different?

Back 32

Other pigments absorb light in addition to chlorophyll A

Front 33

What wavelength of light in the figure is most effective during photosynthesis?

Back 33

420

Front 34

The splitting of carbon dioxide to form oxygen gas and carbon compounds occurs during

Back 34

neither photosynthesis during respiration