Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

BI 2: Electron Transport Chain & Chemiosmosis

No description
by

Kimberly Christian

on 16 November 2016

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of BI 2: Electron Transport Chain & Chemiosmosis

Making ATP:
Electron Transport Chain
& Chemiosmosis

Electrons' Role in Photosynthesis
and Cellular Respiration

*remember that electrons are responsible for the bonding properties of atoms
both photosynthesis & respiration involve a series of reactions where energized electrons are transferred between molecules when bonds are broken and formed
Redox Reactions
OXIDIZED molecule gives electrons to REDUCED molecule
Redox in Photosynthesis
Light + CO2 + H2O --> C6H12O6 + O2
e-
oxidized
reduced
Redox in Cellular Respiration
C6H12O6 + O2 --> ATP + CO2 + H2O
e-
oxidized
reduced
Of course the story isn't that simple!
Electron Carrier Molecules: molecules that temporarily hold electrons during the reactions of photosynthesis and respiration
oxidized carriers (without e-) are readily available in cell (NADP+, NAD+, FAD)
reduced forms are created during the course of P & CR (NADPH, NADH, FADH)
Redox Reaction: any chemical reaction involving the transfer of electrons from one reactant to another

Oxidation: loss of electrons from a molecule (becomes more positive)
Reduction: gain of electrons on a molecule (becomes more negative)
Overview: Photosynthesis
Overview: Cellular Respiration
Stage 1: Light Reaction
uses sun's energy to excite electrons and produce NADPH and ATP

Stage 2: Calvin Cycle
uses energy in NADPH and ATP to affix carbons together to make glucose
Stage 1: Glycolysis/Krebs Cycle
breaks apart glucose to release potential energy

Stage 2: ETC/Oxidative Phosphorylation
uses energy released from glucose to assemble ATP from ADP and Pi
ATP Production during P & CR
ATP: (adenosine triphosphate) molecule storing energy used to do all work within living cells
produced during photosynthesis (Light Reaction) and cell respiration (ETC/Chemiosmosis)
Methods for Making ATP
phosphorlyation: addition of a phosphate group (Pi) to ADP to create ATP in order to store energy

two methods:
substrate-level phosphorylation: direct transfer of phosphate group from one molecule onto ADP to make ATP
oxidative phosphorylation: creation of ATP (from ADP & Pi) using energy released during electron transport chain and chemiosmosis
Electron Transport Chain
Step 1A:
e- "jump" along a series of cytochrome (protein) molecules in membrane
ENERGY is released
Step 1B:
ENERGY released from e- is used to actively transport H+ (protons) across membrane
photosynthesis: along thylakoid membrane
cell respiration: along inner membrane
Chemiosmosis
Step 2A:
H+ are allowed to diffuse back across membrane through ATP synthase (transport protein & enzyme)
ENERGY is released
Step 2B:
ENERGY released from H+ diffusion is used to attach ADP & Pi to make ATP at ATP synthase
photosynthesis: ATP made in stroma
cell respiration: ATP made in matrix
http://vcell.ndsu.nodak.edu/animations/energyconsumption/movie-flash.htm
http://vcell.ndsu.nodak.edu/animations/etc/movie-flash.htm
http://vcell.ndsu.nodak.edu/animations/atpgradient/movie-flash.htm
To start your notes, write out the equations for P & CR.
Leave three lines of space below each.
Photosynthesis:
Cellular Respiration:
Photosynthesis: NADPH carries e- from light reaction to Calvin cycle
Cellular Respiration: NADH, FADH2 carry e- from glycolysis/Krebs cycle to electron transport chain
Full transcript