Chapter 8 - Photosynthesis

Most plants appear green because chlorophyll

absorbs green light

What are the three parts of an ATP molecule?

adenine, ribose, and three phosphate groups

Organisms, such as plants, that make their own food are called

autotrophs

What happens during photosynthesis?

autotrophs produce carbohydrates

Which of the following is NOT a part of an ATP molecule?

chlorophyll

What is the role of NADP+ in photosynthesis

electron carrier

Carbon dioxide - is one of the principle chemical compounds that living things use to store energy

false, ATP

Organisms that cannot make their own food and must obtain energy from external sources are called

heterotrophs

Why are electron carriers needed for transporting electrons from one part of the chloroplast to another?

high-energy electrons are highly reactive

What is a product of the Calvin cycle?

high-energy sugars

Where are photosystems I and II found?

in the thylakoid membrane

Where in the chloroplast is chlorophyll found?

in the thylakoid membrane

How does the Calvin cycle differ from the light-dependent reactions?

it takes place in the stroma

The Calvin cycle is another name for the

light-independent reactions

Which of the following organisms is a heterotroph?

mushroom

Which of the following is NOT found in the overall reaction for photosynthesis?

nitrogen

If carbon dioxide is completely removed from a plant's environment, what would you expect to happen to the plant's production of high-energy sugars?

no sugars will be produced

Which of the following organisms makes its own food using light energy from the sun?

oak

A student is collecting the gas given off from a plant in bright sunlight at a temperature of 27 degrees C. The gas being collected is probably

oxygen

In the overall equation for photosynthesis, six molecules of carbon dioxide and six molecules of water result in a molecule of sugar and six molecules of

oxygen

Photosynthesis uses sunlight to convert water and carbon dioxide into

oxygen and high-energy sugars

Plants gather energy with light-absorbing molecules called

pigments

A granum is a

stack of thylakoids

The Calvin cycle take place in the

stroma

Which structure in Figure 8-2 represents a single thylakoid?

structure C

Look at Figure 8-1. All of the following are parts of an ADP molecule EXCEPT

structure D

Plants get the energy they need for photosynthesis by absorbing

sunlight

Which of the following activities happens within the stroma?

the Calvin cycle produces sugars

What happens when chlorophyll is struck by sunlight?

the electrons in the chlorophyll molecule become energized

If you continue to increase the intensity of light that a plant receives, what happens?

the rate of photosynthesis increases and then levels off

What makes certain molecules good electron carriers?

they can accept electrons and transfer most of their energy to another molecule

The stroma is the region outside the

thylakoids

Chlorophyll a and chlorophyll b both absorb light very well in the - blue and red regions - of the visible light spectrum

true

Plants gather the sun's energy with light-absorbing molecules called - pigments

true

The majority of the cells have only a small quantity of - ATP - because the ATP functions better like a molecule to store short-term energy

true

Ultimately, the energy that a carnivore, such as a wolf, uses comes from - sunlight

true

Which of the following is NOT a true statement about ATP?

used ATP is discarded by the cell as waste

Where do the light-dependent reactions take place?

within the thylakoid membranes

Which structures shown in Figure 8-1 make up an ATP molecule?

A, B, C, and D

Which of the following is NOT a step in the light-dependent reactions?

ATP and NADPH are used to produce high-energy sugars

What are the products of the light-depended reactions?

ATP, NADPH, and oxygen gas

In Figure 8-1, between which parts of the molecule must the bonds be broken to form and ADP molecule?

C and D

What action contributes to the inside of the thylakoid membrane becoming positively charged during the light-independent reactions?

H+ ions are released as water splits

Which pathway represents the flow of electrons during photosynthesis?

H20 --> NADP+ --> Calvin cycle

Which chemical shown in Figure 8-3 is an electron carrier molecule?

NADP+

Energy is released from ATP when

a phosphate group is removed