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

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

space

Light Dependent Reactions

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

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!! (P. 2 & P.6)

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?

Photosynthesis Cell Respiration

CO2 + H2O + light O2 + C6H12O6

O2 + C6H12O6 CO2 + H2O + ATP

CO2 + H2O + Light O2 + C6H12O6

O2 + C6H12O6 CO2 + H2O + ATP

Inputs

Outputs

Chemical Formula

All cells require energy to do work

o Aerobic = NEEDS OXYGEN!!o In aerobic respiration we use oxygen to help release the

energy stored in bonds.

o Anaerobic = does NOT require oxygen

NADH and FADH2

FADH2 (Riboflavin)

FADH2 FAD + 2 H+ + 2e-

B2 Vitamin

Accepts 2 electronsNADH (Niacin)

NADH NAD+ + H+ + 2e-

B3 Vitamin

Accepts 2 electrons

*These are electron carriers!

Do now!!

What is the chemical equation for cellular respiration?

Why are NADH and FADH2 important?

What is the overall goal of cellular respiration?

Objectives

To discuss glycolysis and its importance

To identify the inputs and outputs of glycolysis

To complete a cellular respiration POGIL activity

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/chapter25/animation__how_glycolysis_works.html

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?

How does ATP supply energy for our cells?

Do Now!! (P. 2)

If there was a net gain of 14 ATP in glycolysis, how many glucose molecules were consumed?

If 24 ATP are produced, how many NADH are gained? How many glucose molecules are consumed?

List the steps of cellular respiration and identify where they take place.

Objectives (P.2)

To discuss the Kreb’s cycle and its importance

To identify the inputs and outputs of the Kreb’s cycle

Objectives (P.1 & P.6)

To discuss the Kreb’s cycle and its importance

To identify the inputs and outputs of the Kreb’s cycle

To complete cellular respiration POGIL activity

The Kreb’s Cycle

Please take out your diagrams and grab 2 colors!

The Kreb’s Cycle

1. Pyruvate first reacts with coenzyme A (CoA), forms acetyl CoA. CO2 is released and NAD+ converts to NADH.

2. Acetyl CoA combines with 4 carbon compound, forms 6 carbon citric acid.

The Kreb’s Cycle (continued)

3. Citric acid broken down, releasing CO2 and forming ATP, NADH and FADH2

4. 4 carbon compound regenerated, cycle continues

Total ATP produced: 2 (cycles twice, once for each pyruvate!)

Do Now! (P. 1)

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?

http://highered.mheducation.com/sites/0072507470/student_view0/chapter25/animation__how_the_krebs_cycle_works__quiz_1_.html

Do Now!! (P. 2)

Where does the Kreb’s cycle take place?

What happens to the NADH and FADH2 produced?

If 32 FADH2 are produced in the Kreb’s cycle, how many glucose molecules did you start with?

http://highered.mheducation.com/sites/0072507470/student_view0/chapter25/animation__how_the_krebs_cycle_works__quiz_1_.html

Objectives (P.2)

To identify the inputs and outputs of the electron transport chain.

To complete a cellular respiration POGIL activity

Electron Transport Chain

Please take out your diagrams and grab 2 colors!!

Electron Transport Chain1. NADH and FADH2 release electrons, converted

into NAD+ and FAD (H+ released into the mitochondrial matrix).

2. 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 =

32 ATP molecules

Do Now!! (P. 1)

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?

http://highered.mheducation.com/sites/0072507470/student_view0/chapter25/animation__electron_transport_system_and_atp_synthesis__quiz_1_.html

Objectives

To define anaerobic respiration.

To compare and contrast alcohol fermentation and lactic acid fermentation.

Stand up!

Move your arms up and down for one minute!

Do not stop until the time is up!

What is happening in your arms?

Anaerobic Respiration

Making ATP without oxygen (fermentation)

Problems:

Only 2 net ATP per glucose molecule

Limited amount of NAD+

Yeast, People, Bacteria, Fungus

Used to make beer, wine, and bread

2 Main Types of Fermentation

1. Lactic Acid Fermentation

Pyruvate from glycolysis converted to lactic acid

Lactic acid is associated with the “burn” associated with heavy exercise

If too much lactic acid builds up, your muscles feel sore and may give out

Lactic Acid Fermentation

Inputs:

Glucose, 2ADP

Outputs:

2ATP, 2 lactic acid

Ex:

Bacteria that help in making yogurt, cheese and sour cream.

Human muscle cells when out of oxygen.

Lactic Acid Fermentation

Physical conditioning allows your body to adapt to increased activity:

The body can increase its ability to deliver oxygen to muscles

Long-distance runners wait until the final sprint to exceed their aerobic capacity

2 Main Types of Fermentation

2. Alcohol Fermentation

In yeast and some bacteria

Pyruvate is converted to ethyl alcohol and carbon dioxide Ex: yeast used for baking bread

and making wine/beer

https://www.youtube.com/watch?v=i1w09QKf9GU

Alcohol Fermentation

Inputs:

Glucose, 2ADP

Outputs:

2ATP, 2 ethanol, 2 CO2

NAD+ gets regenerated

Why don’t you get drunk off bread?

o Take a minute and pair up with the person sitting NEXT to you and discuss this question.

Aerobic vs. Anaerobic Respiration

Lactic acid or CO2/ethanol

Cytoplasm

Do Now!!

What happens when we don’t get enough oxygen?

What does our body do?