Photosynthesis As a Metabolic Process. What is it? Process where green plants (and certain photosynthetic bacteria) absorb sunlight and convert it to.

Slides:



Advertisements
Similar presentations
Almost all plants are photosynthetic autotrophs, as are some bacteria and protists –Autotrophs generate their own organic matter through photosynthesis.
Advertisements

An Overview of Photosynthesis Most of the energy used by almost all living cells ultimately comes from the sun  plants, algae, and some bacteria capture.
Almost all plants are photosynthetic autotrophs, as are some bacteria and protists –Autotrophs generate their own organic matter through photosynthesis.
Pathways that Harvest and Store Chemical Energy
Lecture 3 Outline (Ch. 8) Photosynthesis overview
Photosynthesis. Photosynthesis: An Overview  Electrons play a primary role in photosynthesis  In eukaryotes, photosynthesis takes place in chloroplasts.
Photosynthesis. 1. An Overview of Photosynthesis & Respiration 2. Autotrophs and producers 3. Electromagnetic Spectrum & light energy 4. Chloroplasts:
Photosynthesis. A. Background 1. The conversion of light energy (from the sun) into chemical energy (stored in sugar & organic molecules. 2. Plants, algae.
Concept 8.1 PHOTOSYNTHESIS USES LIGHT ENERGY TO MAKE FOOD.
Photosynthesis Ch 7. Autotrophs Chloroplasts Contain chlorophyll – Green Site of photosynthesis Concentrated in leaves.
Ch. 4 Cellular Energy Production & Harvest. Energy = First law of thermodynamics = energy cannot be created or destroyed. It can be converted to different.
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. CHAPTER 8.
CHAPTER 10.  stomata – pores in lower epidermis of leaf  gas exchange  mesophyll – inner-leaf tissue  most chloroplasts located in these cells  veins.
Photosynthesis 6 CO H 2 O --> C 6 H 12 O O H 2 O carried out by photoautotrophs Solar energy --> chemical energy redox process- water.
Photosynthesis Chapter 8. 2 Photosynthesis Overview Energy for all life on Earth ultimately comes from photosynthesis. 6CO H 2 O C 6 H 12 O 6 +
PHOTOSYNTHESIS
Photosynthesis Light reactions – light-dependent reactions – energy conversion reactions convert solar energy to chemical energy ATP & NADPH Calvin cycle.
Chapter 10 Plant Metabolism I. Introduction This chapter will only deal with basic primary metabolism which includes: A. Photosynthesis B. Respiration.
PHOTOSYNTHESIS Chapter 10. PHOTOSYNTHESIS Overview: The Process That Feeds the Biosphere Photosynthesis Is the process that converts light (sun) energy.
Photosynthesis. What is it? Photo – light Synthesis – to make The process of converting light energy to chemical energy and storing it as sugar.
Photosynthesis Conversion of light energy from the sun into stored chemical energy in the form of glucose and other organic molecules.
Photosynthesis Chapter 7 Mader: Biology 8th Ed..
Raven - Johnson - Biology: 6th Ed. - All Rights Reserved - McGraw Hill Companies Photosynthesis Copyright © McGraw-Hill Companies Permission required for.
Photosynthesis. -the transfer of energy from sunlight to organic molecules -occurs in green plants, algae and some bacteria - involves a complex series.
Fig Stages of Photosynthesis 1.Capturing light energy 2.Using this energy to make ATP to split H2O molecules and use (H+) to reduce NADP+ to.
Chapter 10 Photosynthesis.
Overview: The Process That Feeds the Biosphere Photosynthesis is the process that converts solar energy into chemical energy Directly or indirectly, photosynthesis.
THE SUN: MAIN SOURCE OF ENERGY FOR LIFE ON EARTH
Photosynthesis.
Energy can be transformed from one form to another FREE ENERGY (available for work) vs. HEAT (not available for work)
Photosynthesis Ch 7. Autotrophs Chloroplasts Contain chlorophyll – Green Site of photosynthesis Concentrated in leaves.
Photosynthesis: Life from Light
What is Photosynthesis?
AP Biology 2 Notes Chapter 10 Photosynthesis. Introductory Vocab Heterotrophs Autotrophs Chemoautotrophs Mesophyll Stroma Grana Thylakoids.
Cellular Respiration1 Photosynthesis - Chapter 8 Topics you are responsible for This chapter goes into much more detail than for what you will be responsible.
Pathways that Harvest and Store Chemical Energy 6.
Photosynthesis Chapter 7. We depend on the solar energy of a star 93 million miles away—our Sun! We depend on the solar energy of a star 93 million miles.
THE BASICS OF PHOTOSYNTHESIS
Photosynthesis Chapter 8. 2 Photosynthesis Overview Energy for all life on Earth ultimately comes from photosynthesis. 6CO H 2 O C 6 H 12 O 6 +
Chapter 5 Photosynthesis
Ch. 10 part 1 The light reaction. I. Autotrophs- Organisms that make their own food (convert light energy to chemical energy) I. Autotrophs- Organisms.
Converting Light Energy into Chemical Energy
PHOTOSYNTHESIS CH 10. Autotrophs are the worlds producers. Photoautotrophs produce organic molecules using solar energy. Chemoautotrophs produce organic.
Chapter 10 Photosynthesis. main idea: making glucose autotroph – self-feeder; -organism which makes its own food a) phototrophic – uses light b) chemotrophic.
Photosynthesis The Light Reaction Photosynthesis takes place in the chloroplasts in areas known as photosystems – Photosystems - complexes containing the.
Photosynthesis The original Green Technology.. Photosynthesis in nature Autotrophs: biotic producers –obtain organic food without eating other organisms.
PHOTOSYNTHESIS watch?v=tSHmwIZ9FNw.
Chapter 10. Photosynthesis uses the energy of sunlight to convert water and carbon dioxide into high-energy sugars and oxygen.
THE BASICS OF PHOTOSYNTHESIS
Photosynthesis
PHOTOSYNTHESIS.
Photosynthesis.
Overview: The Process That Feeds the Biosphere
AN OVERVIEW OF PHOTOSYNTHESIS
Photosynthesis Chapter 10.
THE BASICS OF PHOTOSYNTHESIS
Photosynthesis.
Photosynthesis.
Chapter 8 Section 2: Photosynthesis
Photosynthesis Chapter 8.
Photosynthesis Chapter 10.
Photosynthesis overview
Photosynthesis!!!!.
THE BASICS OF PHOTOSYNTHESIS
Photosynthetic organisms are producers.
Photosynthesis: Using Light to Make Food
Photosynthetic organisms are producers.
Lecture 3 Outline (Ch. 8) Photosynthesis overview
Section 2: Photosynthesis
Photosynthesis: Life from Light
Presentation transcript:

Photosynthesis As a Metabolic Process

What is it? Process where green plants (and certain photosynthetic bacteria) absorb sunlight and convert it to stored chemical energy Energy transformation from radiant to chemical energy (Laws of Thermodynamics apply) A knowledge of both chemistry and physics are relevant to an understanding of photosynthesis

Summary Equation CO 2 + H 2 O  (CH 2 O) n + O 2 State of knowledge in 1900 Energy requiring reaction Green plants and sunlight needed Oxidation/reduction reaction

Global Impact CO 2 and O 2 are recycled by plants Photosynthesis changed the atmosphere for aerobes Photosynthesis ties up greenhouse gases (CO 2 ) in vegetation

Light absorption is primarily carried out by chlorophyll Chlorophyll has a characteristic absorption spectrum Why are green plants green? Two types of chlorophyll “a” and “b” What is the advantage for plants to having two types of chlorophyll? What is the purpose of accessory Pigments?

Photosynthetic pigments are found in the chloroplast in protein-pigment complexes Photosynthetic pigments are found in thylakoid membranes

Thylakoids have three types of pigment complexes Photosystem I (mostly chl a) - P680 reaction center Photosystem II (mostly chl a) - P700 reaction center LHC (Light Harvesting Complex) (~1:1 chl a to b) Role of LHC

What happens to light filtered through a plant canopy? Role of LHC? Chl a/b ratio

What happens when a photon (of correct energy) is absorbed by chlorophyll? Electron returns to ground state (heat emitted) Electron returns to ground state (photon emitted as fluorescence) Electron transferred to an acceptor molecule (photochemistry) Photon energy absorbed by electron leads to an unstable “excited state”

How do the photosystems cooperate?

What are the products of the light reactions? NADPH ATP O 2

The synthesis of carbohydrates in photosynthesis involves the reduction of CO 2 CO 2  (CH 2 O) n Where does the energy come from? Metabolic process called the Calvin Cycle

Key reaction in the Calvin Cycle Rubisco – the most abundant protein on earth

Calvin Cycle has two essential tasks

Rubisco has both carboxylase and oxygenase activities O=C=O and O=O look similar to enzyme active site Oxygenase reaction: O 2 + RUBP  3 PGA + 2 phosphoglycolate (2C) 2(2 phosphoglycolate)  3 PGA + CO 2 Release of CO 2 is photorespiration

Impact of photorespiration? Air: 21% O 2 and 0.03% CO 2 CO 2 and O 2 compete for active site of rubisco 34% of rubisco activity is oxygenase Alternate CO 2 assimilation metabolism: C4 and CAM

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.