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Cellular Energy is Stored as ATP
Today:
•
Cellular Respiration & Photosynthesis
Friday:
Please print and read Lab 3 before class!
Lab 2 Due
Adding Enzymes to the Picture…
Enzymes can be regulated!
How do enzymes catalyze reactions?
Energy Flow
and
Chemical
Cycling
Let’s Review!
1
A Review of Cellular Respiration
Step 1: Glycolysis
Step 2: Kreb’s Cycle
Step 3: Electron Transport Chain
Does the electron
transport chain work
when oxygen is not
present?
Fermentation
Can you generate
energy without
oxygen? If so, how?
2
Anaerobic
Respiration
Cellular
Respiration
usually requires
OXYGEN as the
final electron
acceptor. But
ANAEROBIC
respiration can
occur with an
alternate
electron
acceptor.
1: J Anal Toxicol. 2006 Apr;30(3):219-22.
Two deaths attributed to the use of 2,4-dinitrophenol.
Cellular Respiration: Adding it up!
You Try! Part 1 A & B
Where does Photosynthesis occur?
Miranda EJ, McIntyre IM, Parker DR, Gary RD, Logan BK.
Washington State Toxicology Laboratory, Washington State Patrol, 2203 Airport Way South, Seattle, Washington 98134, USA.
We report the cases of two individuals, one in Tacoma, WA, and the second
in San Diego, CA, whose deaths were attributed to ingestion of 2,4dinitrophenol (2,4-DNP). 2,4-DNP has historically been used as a herbicide
and fungicide. By uncoupling mitochondrial oxidative phosphorylation, the
drug causes a marked increase in fat metabolism that has led to its use to
aid weight loss. Both cases reported here involved its use for this purpose.
Features common to both cases included markedly elevated body
temperature, rapid pulse and respiration, yellow coloring of the viscera at
autopsy, history of use of weight loss or body building supplements, and
presence of a yellow powder at the decedent's residence. Because of its
acidic nature, the drug is not detected in the basic drug fraction of most
analytical protocols, but it is recovered in the acid/neutral fraction of
biological extracts and can be measured by high-performance liquid
chromatography or gas chromatography-mass spectrometry. The
concentration of 2,4-DNP in the admission blood samples of the two deaths
reported here were 36.1 and 28 mg/L, respectively. Death in both cases
was attributed to 2,4-DNP toxicity. Review of information available on the
internet suggests that, although banned, 2,4-DNP is still illicitly promoted
for weight loss.
PMID: 16803658 [PubMed - indexed for MEDLINE]
Photosynthesis :
Note that
Photosynthesis
a 2-step
process!
Collecting
Solar Energy
So why to leaves
change color?
Do some plants
use more than
one pigment?
What would be
the advantage of
that?
3
Collecting Solar Energy
The Light Reactions: The Full Story
The Light Reactions: Generating ATP
The Light
Reactions:
A
Concept
Map!
Next:
Photosynthesis,
Step 2 (the
synthesis!)
Step 2:
The
Calvin
Cycle
Hey!! I’ve seen this before!!
Photosynthesis :
4
Thinking About Photosynthesis
Thinking About
Photosynthesis
You Try! Part 2 A, B, and
Part 3!
What do these plants need to do to prevent
water from evaporating out their stomata all
day?
What are the implications of this??
One Last Application
Thinking About
Photosynthesis!
Hmm… What
could I do if I
knew which
genes were
responsible for
this??
You Try! Part 3
Lab Friday…
5