Photosynthesis/Chemosynthesis

Photosynthesis/Chemosynthesis Photosynthesis/Chemosynthesis - Start

2016-03-01 32K 32 0 0

Photosynthesis/Chemosynthesis - Description

Autotrophs. :. Organisms that are capable of producing/creating their own food. Photoautotrophs. – sunlight drives the energy production process. Chemoautotrophs. – can extract energy from an inorganic substance. ID: 237701 Download Presentation

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Photosynthesis/Chemosynthesis




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Presentations text content in Photosynthesis/Chemosynthesis

Slide1

Photosynthesis/Chemosynthesis

Slide2

Autotrophs:

Organisms that are capable of producing/creating their own food

Photoautotrophs

– sunlight drives the energy production process

Chemoautotrophs

– can extract energy from an inorganic substance

Slide3

heterotrophs

Organisms that need to get their energy from organic compounds already put together by other organisms

Slide4

Photosynthesis

Method by which autotrophs use their energy from the sun to create carbon compounds and energy rich molecules

Slide5

Key Concepts

Carbon-based compounds are the building block of energy stores

Plants assemble these compounds through photosynthesis

Slide6

Process Overview

Water + Carbon Dioxide

 Oxygen + Glucose

12 H

2

O+ 6 CO

2

 6 O

2

+ C

6

H

12

O

6

+ 6 H

2

O

Sunlight is trapped and converted into chemical energy (ATP)

ATP delivers energy to reactions that create glucose

Glucose units are combined to create starch and other materials

Slide7

1st Stage: Light Dependent Reactions

Energy from the sun is captured and converted to ATP

Water molecules are split

Coenzyme (substance that aids an enzyme in reactions) NADP+ picks hydrogen particles and electrons forming NADPH (electron carrier)

Slide8

2nd Stage:Light Independent Reactions

ATP donates energy so glucose can be formed from carbon, hydrogen, and oxygen

The carbon and oxygen comes from carbon dioxide

The hydrogen comes from the water via NADPH

Slide9

Chloroplast

Photosynthetic organelle found in photoautotrophs, site of photosynthesis

Slide10

Stroma

The interior of the chloroplast that contains the grana

Slide11

THYLAKOID

Flattened discs whose stacks are called the Granum/Grana

Slide12

Pigments

Molecules that absorb light

Chlorophyll is the main pigment

Slide13

Light Dependent Reactions – In Depth

1

st

stage of Photosynthesis:

Pigments absorb sunlight and release electrons

Electrons and hydrogen ions transfer energy that leads to ATP and NADPH formation

The pigments that gave up electrons in the first place get electron replacements

Slide14

Non-Cyclic ATP Formation

Photolysis:

water molecules are split into oxygen, hydrogen ions, and electrons

Oxygen released as a waste product

The abundance of hydrogen ions creates an electrical/concentration gradient inside the thykaloid

Combined force of gradients pumps ions out into stroma creating energy needed to create ATP out of ADP

Slide15

Light Independent Reactions – In Depth

2

nd

Stage of Photosynthesis: “Calvin Benson Cycle”

ATP molecules deliver energy

ATP and NADPH molecules deliver the required hydrogen and electrons

Carbon Dioxide provides the needed carbon and oxygen

Can proceed in the dark as long as the above substrates are present

Slide16

Calvin Benson Cycle:

Carbon Dioxide diffuses across the membrane and is fixed to a five carbon compound (carbon fixation)

This unstable six carbon compound is broken down and reformed into a six carbon sugar which can be formed into sucrose, starch, cellulose, etc.

Slide17

Effects of the Environment

A)

Light Intensity

– as light intensity increase so does the rate of photosynthesis till all the pigments reach a saturation point

B)

Concentration of Carbon Dioxide

– As CO2 concentration increases so does the rate of photosynthesis till all structures are being used at which point it levels out

C)

Temperature

– There is an optimal temperature at which photosynthesis is most efficient, too extreme and it decreases (related to enzymes and water)

Slide18

Chemosynthesis:

Process by which bacteria get energy by pulling hydrogen and electrons from ammonium ions, iron or sulfur compounds, and other inorganic materials

Get carbon from carbon dioxide


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