DO NOW!!  What is the difference between an autotroph and a heterotroph? Why do plants need sunlight? What gases are exchanged between plants and animals?

Overview Of Photosynthesis

Objectives To be able to list the inputs and outputs of photosynthesis. To be able to identify the structures in a chloroplast. To be able to summarize light- dependent reactions.

Photosynthesis Process of converting light energy to chemical energy!! Used by autotrophs to produce food All of our energy starts as light energy! Plants use sunlight to make food animals eat plants other animals eat those animals

Photosynthetic Organisms Go through Photosynthesis to produce GLUCOSE… Autotrophs “Producers” in the food web Consist of plants, protists, cyanobacteria

Photosynthesis: The Chemical Equation

Overview of Phases 1) Light dependent Light energy is absorbed and converted into chemical energy in the form of ATP and NADPH. (also produces oxygen as byproduct!) 2) Light independent (Calvin Cycle) CO2 ATP and NADPH (from light dependent) are used to make glucose. *Glucose is the basic building block for more complex sugars such as starch.*

Do Now!!  What are the two phases of photosynthesis? What are the inputs and outputs of each phase? What is the chemical equation for photosynthesis?

Objectives To go over the steps of light dependent reactions To understand the inputs and outputs of light dependent reactions To label a light reactions diagram

Phase Overview Glucose

The Chloroplast

Structures within a chloroplast Thylakoids: flattened sac-like membranes arranged in stacks (stacks are called grana). Light-dependent reactions take place here. Electron transport occurs in the thylakoid membrane Stroma: Fluid filled space outside the grana. Light-independent reactions take place here.

Do Now!!  What is the equation for photosynthesis? Where do light dependent reactions take place? Independent? What are the inputs of light dependent reactions? The outputs?

Objectives To go over the steps of light dependent reactions To understand the inputs and outputs of light dependent reactions To label a light reactions diagram

Diagram! Please grab 6 different colors!! Lets label our light dependent reactions diagram.

Light Dependent Reactions Step 1: Light energy reaches photosytem II, exciting electrons and causing water molecule to split. - H+ is released, stays in thylakoid space. - O2 is given off as a byproduct. - Electron released into electron transport system

Light Dependent Reactions Step 2: Excited electrons move from photosystem II through the membrane As they move, protons (H+) are pumped into thylakoid space

Light Dependent Reaction Step 3: At photosystem I, electrons are re-energized and transferred to ferrodoxin (helper protein): NADPH (energy storage molecule) is formed from NADP+ (we need this for the Calvin Cycle!)

Light Dependent Reactions Step 5: Hydrogen ions move through the ATP Synthase because of the concentration gradient, creating ATP from ADP. (Chemiosmosis)

Do Now!!  What goes into a light dependent reaction? What is the goal of a light dependent reaction? What is given off as a byproduct? What is the name of the protein that converts NADP+ to NADPH?

Objectives To review light dependent reactions To introduce light independent reactions by completing a Calvin Cycle activity

Think-pair-share Please work on the worksheet in front of you! Try it by yourself, then you may work with a partner.

Light Dependent Reactions http://www.science.smith.edu/departments/Biology/Bio231/ltrxn.html https://www.youtube.com/watch?v=joZ1EsA5_NY

Do Now!!  Please take out the light dependent worksheet from yesterday!

Objectives To identify the stages of light independent reactions To identify alternative pathways To define C4 and CAM plants

The Calvin Cycle Takes place in the STROMA Uses NADPH and ATP from Phase I (light dependent reactions) Needs CO2!!! Produces GLUCOSE!!

Calvin Cycle Functions like a sugar factory within a chloroplast Regenerates the starting material with each turn Calvin Cycle

Calvin Cycle Inputs ATP NADPH CO2 Outputs Glucose

Calvin Cycle

Chemiosmosis Mechanism in which ATP is produced as a result from the flow of electrons down a concentration gradient. Ex: Light reactions (H+ ions and ATP synthase)

Alternative Pathways Light and Water can limit the amount of photosynthesis a plant can perform. Some plants develop alternate pathways to maximize energy conservation. Ex: CAM and C4 plants.

C4 Plants These plants minimize water lost Turn CO2 into a 4 carbon molecule instead of a 3 carbon molecule Keeps stomata (plant cell pores) closed during hot days Ex. Corn and Sugar Cane

CAM Plants Occurs in water-conserving plants that live in deserts and other arid environments Stomata ALWAYS closed during the day CO2 only enters leaves at night, turns into a “storage molecule” until daytime Ex. Orchids, cacti, pineapples

Do Now!!  How does our body make energy? What are the outputs of photosynthesis? What do you think the outputs of cellular respiration are?

Objectives (Period 1 & 2) To compare and contrast photosynthesis and cellular respiration To identify the inputs and outputs of cellular respiration To define NADH and FADH2 To complete a cellular respiration exercise lab!

Objectives (Period 6) To compare and contrast photosynthesis and cellular respiration To identify the inputs and outputs of cellular respiration To define NADH and FADH2

So, what is cellular respiration?

How does cellular respiration compare to photosynthesis? Cell Respiration CO2 + H2O + light O2 + C6H12O6 CO2 + H2O + ATP CO2 + H2O + Light  O2 + C6H12O6  Inputs Outputs Chemical Formula

All cells require energy to do work Aerobic = NEEDS OXYGEN!! In aerobic respiration we use oxygen to help release the energy stored in bonds. Anaerobic = does NOT require oxygen

NADH and FADH2 FADH2 (Riboflavin) FADH2 FAD + 2 H+ + 2e- B2 Vitamin Accepts 2 electrons NADH (Niacin) NADH NAD+ + H+ + 2e- B3 Vitamin *These are electron carriers!

Let’s try some sample math problems before we begin Spongebob is selling Krabby patties. He paid 2 dollars per Krabby patty and is selling each at 7 dollars. How much NET profit is Spongebob making if he sells 1 Krabby patty? 10 Krabby patties?

Steps of Cellular Respiration Step 1: Glycolysis (anaerobic, cytoplasm) Step 2: Krebs Cycle (aerobic, mitochondrial matrix) Step 3: Electron Transport Chain (aerobic, mitochondrial membrane)

Lets color code Please take out your diagrams and grab 2 colored pencils!

Glycolysis  

Glycolysis (continued) 4. 4 molecules of ADP are used to make 4 ATP, and G3P compounds are converted into 2 molecules of Pyruvate. 5. The net total being 2 ATP molecules http://highered.mcgraw- hill.com/sites/0072507470/student_view0/ch apter25/animation__how_glycolysis_works.ht ml

Do Now!!  If there was a net gain of 28 ATP in glycolysis, how many glucose molecules were consumed? If 18 NADH are produced, how many ATP are gained? How many glucose molecules are consumed? What are the outputs of glycolysis?

Objectives

The Kreb’s Cycle Please take out your diagrams and grab 2 colors!

The Kreb’s Cycle Pyruvate first reacts with coenzyme A (CoA), forms acetyl CoA. CO2 is released and NAD+ converts to NADH. Acetyl CoA combines with 4 carbon compound, forms 6 carbon citric acid.

The Kreb’s Cycle (continued) Citric acid broken down, releasing CO2 and forming ATP, NADH and FADH2 4 carbon compound regenerated, cycle continues Total ATP produced: 2 (cycles twice, once for each pyruvate!)

Sooo… Where does the Kreb’s cycle take place? Why are there 2 total ATP produced instead of 1? What happens to the NADH and FADH2 produced? If 6 FADH2 are produced in the Kreb’s cycle, how many glucose molecules did you start with?

Electron Transport Chain Please take out your diagrams and grab 2 colors!!

Electron Transport Chain NADH and FADH2 release electrons, converted into NAD+ and FAD (H+ released into the mitochondrial matrix). H+ ions are pumped across inner mitochondrial membrane as electrons move along membrane (with the help of proteins).

Electron Transport Chain (continued) 3. Oxygen is final electron acceptor (protons and electrons combine with oxygen to form water). 4. H+ ions then diffuse back into matrix through ATP synthase (chemiosmosis), producing 32 ATP. Total ATP produced for one molecule of glucose = 36 ATP molecules

Soooo… Where does the electron transport chain take place? How many ATP are produced? How many total molecules of ATP are produced for one molecule of glucose?