Chapter 8

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Light Dependent Reactions ( LDR )

They require the direct involvement of light and light and absorbing pigments, uses energy from sunlight to produce energy rich compounds such as ATP

Electron transport chain

A series of electron carrier proteins that shuttle high energy electrons during ATP generating reactions

Light Independent Reactions ( LIR )

ATP AND NADPH molecules produced in light-dependent reactions are used to produced high-energy sugars from carbon dioxide

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

ATP and NADPH are used to produce high-energy sugars.

Products of light dependent reactions

ATP, NADPH and Oxygen gas

NADP+

Accepts and holds 2 high energy electrons along with a hydrogen ion (H+)

Three parts of ATP molecule

Adenine , ribose and 3 phosphate

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

Chlorophyll

Thylakoids

Chloroplasts contain an ambulance of saclike photosynthetic membrane

Most plants appear green because chlorophyll

Does not absorb green light

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

H+ ions are released as water splits

Which pathway represents the flow of electrons during photosynthesis?

H2O > NADP+ > Calvin cycle

Calvin cycle takes place

Light independent reaction

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

Autotrophs

Organisms that make their own food

Heterotrophs

Organisms that obtain food by consuming other living things

A student is collecting the gas given off from a plant in bright sunlight at a temperature of 27°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

Plants absorb sunlight

Pigments

Plants gather the sun's energy with light absorbing molecules

Calvin cycle

Plants use the energy that ATP and NADPH contain to build stable high energy carbohydrate compounds that can be stored for a long time.

ATP synthase

Spans the membrane and allows H+ ions to pass through it.

Grana

Stack of thylakoids

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

The Calvin cycle uses the ATP and NADPH produced during the light-dependent reactions to produce high-energy sugars.

Where are Photo systems 1 and 2 found

The Thylakoid membrane

ATP

The compounds the cells use to store and release energy like Adenosine and 5-Carbon sugar.

What happens when chlorophyll is struck by sunlight?

The electrons in the chlorophyll molecules become energized.

Stroma

The fluid portion of the chloroplast, outside of the thylakoids

Chlorophyll

The plant's principal pigment

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

The rate of photosynthesis increases indefinitely with light intensity.

Where in the chloroplast is chlorophyll found?

Thylakoid

Photosystems

Thylakoids contain clusters of chlorophyll and proteins

Energy is released from ATP when

When a phosphate group is removed

What happens during photosynthesis?

light energy is converted to chemical energy and then stored in the form of bonds of sugar.

Where do the light-dependent reactions take place?

within the thylakoid membranes


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