AP Biology Discussion Notes

Monday 12/08/2014

Goals for the Day

1. Be able to write a chemical equation for photosynthesis (and understand its complexities)

2. Be able to describe the two parts of photosynthesis

3. Be able to describe the importance of the photosynthetic process.

Question of the Day 12/08

What is the difference between Heterotrophs & Autotrophs? Give examples of each.

Autotrophs vs. Heterotrophs

•Autotroph

•Heterotroph

(a) Plants(b) Multicellular

alga

(c) Unicellularprotists

(d) Cyanobacteria

(e) Purple sulfurbacteria

10 m

1 m

40 m

Figure 10.2

Photoautotrophs

Photosynthesis

_________ energy ________energy

Is this important?

The MIRACLE OF LIFE!

Inorganic Organic

Fossil Fuel

• What is a fossil & what does “fossil” fuel mean?

• Is this a renewable resource?

• Where did the chemical energy in fossil fuels originally come from?

Alternative BioFuels

Alternative BioFuels

What major plant part is responsible for photosynthesis?

Mesophyll cell (inner leaf) may have 30-40 chloroplasts in each Cell!

Where did chloroplasts come from?(What theory is this?)

• What evidence is there for that?

• What kind of cells have chloroplasts?

The Mighty Chloroplast

The Skeleton of a Chloroplast

Membranes allow cells to do what?

• Movement in/Out• ORGANIZATION• Build a Gradient

– DO WORK

SUMMARY Chemical Equation for Photosynthesis

CO2 + H2O C6H12O6 + O2

Van Niel – 1930s

• Studies mechanism of photosynthesis in bacteria that do not produce Oxygen.

• Wanted to know where the Oxygen produced in Photosynthesis comes from.

Van Niel – 1930s

• Studies mechanism of photosynthesis in bacteria that do not produce Oxygen.

CO2 + 2H2S [CH2O] + H2O+2S

Van Niel – 1930s

• So where must the oxygen come from?

CO2 + 2H2S [CH2O] + H2O+2S

Figure 10.5

Reactants:

Products:

6 CO2

6 H2O 6 O2

12 H2O

C6H12O6

Photosynthesis in 2 Stages

• Light reactions (light dependent reactions) – done in the thylakoid membranes

• Calvin Cycle (light Independent reactions)– Done in the stroma

Light Reactions

• Light + H2O NADPH + ATP + O2

• Water supplies Electrons and Hydrogen ions that will power chemiosmosis and Phosyphorylation of ADP to ATP.

Calvin Cycle

• CO2 Carbohydrate

• Recycles ADP/NADP+

The MIRACLE OF LIFE!

Inorganic Organic

Light

LightReactions

Chloroplast

NADP

ADP

+ P i

H2O

Figure 10.6-1

Light

LightReactions

Chloroplast

ATP

NADPH

NADP

ADP

+ P i

H2O

O2

Figure 10.6-2

Light

LightReactions

CalvinCycle

Chloroplast

ATP

NADPH

NADP

ADP

+ P i

H2O CO2

O2

Figure 10.6-3

Light

LightReactions

CalvinCycle

Chloroplast

[CH2O](sugar)

ATP

NADPH

NADP

ADP

+ P i

H2O CO2

O2

Figure 10.6-4

Reading Assignment

• Already started Chapter 10 Notes

• Start on page 192 – Think about what you are doing!– Draw figures– Read and then summarize– Leave yourself room to add information

Business• Turn in: CELL RESPIRATION LAB

• Finish 10.2 Notes (through 197) for tomorrow

• Know that we will take notes through 10.3, so if you prefer to read that at home or want to start doing that GO RIGHT AHEAD!

Species of the day 12/08• Volvox (Algae) -Volvox carteri

Species of the day 12/08• Volvox (Algae) -Volvox carteri

Does this photosynthetic Algae still need to do Cellular Respiration? Explain