Photosynthesis Review

Honors Biology

Organisms that can synthesize their own food from inorganic

materials are called_____.

Autotrophs

All ______ rely on autotrophs for food, since autotrophs are the

producers of the food web.

Heterotrophs

The electromagnetic spectrum ranges from gamma radiation to

_______ waves.

Radio

On the visible spectrum, energy content of light is greatest for

______.

Violet light

What two things must go into the light reactions?

Water, Light

The color _____ has the shortest wavelength.

Violet

The color _____ has the lowest energy.

Red

Which colors are most useful in photosynthesis?

Red, violet, and blue

What type of wavelengths do high-energy photons have?

Short wavelengths

Where on the electromagnetic spectrum is visible light found?

In a small portion in the middle of the spectrum. Ranging from about

400 nm- 750 nm

Which of these phosphorylates ADP to make ATP? What is it called?

E- ATP Synthase

_____ releases energy that is used to create the H+ gradient in the thylakoid. What is it called?

B- Electron transport chain

Water is split into oxygen and H+ by ____. What is it called?

A- Photosystem II

Electrons leaving ___ will be used to reduce NADP+. Name?

C- Photosystem I

Where on this diagram would chlorophyll be found?

A and C- The Photosystems

What is D?

Thylakoid space or compartment.

What limits the progress of the Calvin cycle?

Carbon dioxide, light, temperature (enzymes!).

Carbon fixation involves adding carbon dioxide to ____.

RuBP

After PGA is phosphorylated, it is reduced by ______.

NADPH

How many carbon dioxide molecules are needed to make

one molecule of glucose?

6

How many ATP are required to regenerate RuBP from PGAL?

3

How many ATP are necessary to phosphorylate PGA?

6 ATP

NADPH and ATP are used in the light _________ reactions of

photosynthesis.

Independent (Calvin Cycle)

Water is split and oxygen is released in which reactions of

photosynthesis?

Light-dependent reactions

What molecule is the oxygen formed from during

photosynthesis?

Water

During chemiosmosis, the H+ concentration is higher in the

____ of the chloroplast.

Thylakoid space.

During chemiosmosis hydrogen ions flow _____ their concentration gradient through _____________ in

the thylakoid membrane.

Down; ATP synthase

In the Calvin cycle, carbon dioxide is (oxidized/reduced) to

form PGAL.

Reduced

Five molecules of PGAL are used to re-form _____ molecules of RuBP.

3

Water vapor exits and carbon dioxide enters through the ___ in

the leaf.

Stomata.

When photons hit the photosystems electrons from ____ molecules are excited.

Chlorophyll

To make one molecule of glucose, how many ATP are

necessary?

18 ATP

How many carbons does a molecule of RuBP have?

5

Carbon fixation occurs in the ___ of the chloroplast.

Stroma

Why is light necessary in photosynthesis?

It energizes the electrons.

What is the equation for photosynthesis?

6CO2 + 6H2O + light energy C6H12O6 + 6O2