Kiss energy conversinon and metabolic compartmentalization: mitchondria+chlorplast Flashcards
How do bacteria generate energy, what do they create to generate energy?
-what is the energy source for animals vs plants
Bacteria generates energy through having 2 membranes and then creates a potential where they separate and concentrate things to create a gradient and when that gradient is released energy is created.
-This energy (potential and kinetic energy) to generate a chemical energy source -> animals do it via mitochondria and plants do it through chloroplasts
How does energy production in the mitochondrion start (in what cycle/what is produced)?
-In the mitochondrion, energy-rich molecules derived from fat, carbohydrate, or protein degradation are fed into the citric acid cycle.
-This cycle provides electrons to generate the energy-rich compound NADH (electron holder) from NAD+.
After NADH has been produced in the mitochondirion energy productino cycle what happens after? How do we get ATP?
The NADH electrons then flow down an energy gradient in the mitochondrial electron-transport chain, until they combine with molecular O2 and H+ in the final complex to produce water.
-this produces ATP
What does mitochondria use as its energy source vs chlorplast?
-mitchondria uses chemical fuels like fat, carbs, etc
chlorplasts use sunlight
What are 2 parts of the body that have lots of mitochondria
-cardiac muscle and sperm tail
What is the main thing that causes ATP formation in the mitchondria/chloroplasts
-coupling electrons down a concentration gradient allows us to create ATP
What does the mitochondria have in its structure?
Why is the cristae structure important
-it has 2 membranes OMM, and IMM (has folds called cristae)
-cristae has organization of etc and it serves as a cup to collect the protons to create a proton motive force
What is important about mitchondria what events can it undergo?
-it has its own DNA and can undergo fusion and fission events
Why would mitochondria undergo fission?
What is fission?
Where does the part that undergoes fission go?
fission is when the mitchondria gets cut up
-would undergo fission because of oxidative stress to send all of the garbage to one side of the mitochondria and cut it
-cut portion goes to lysosome to be degraded
What is mitochondria fusion?
-they would fuse during cell cycle or to form polymers
What is used in the mitochondria to pinch off some parts?
-what is used as energy for the fission
-dynamin is used to contrict the microtubules and undergo fission to pinch off parts
-dynamin uses GTP as energy
What goes into the citric acid cycle to commence it?
acetyl CoA (2 carbons) is made from amino acid, fatty acid, pyruvate and ketone bodies
What happens when Acetyl Coa goes into citric acid cycle?
What do the enzymatic steps do?S
-citrate synthase combines acetyl CoA (2 carbons) with oxaloacetate (4C) and make a 6 C compound citrate
-after enzymatic steps we lose the 2 C that came in from acetyl CoA, they come out as CO2 and we
regenerate oxaloacetate
What is produced after regenerating oxaloacetate?
What is NADH and FADH2, what is their energy output?
in addition to producing the 2 CO2 we created GTP as an energy source & 2 NADH and 1 FADH2
* NADH is an energy source, FADH2 is a similar reduction equivalent we can derive energy from
* From every NADH we get 3 ATP and every FADH2 we get 2 ATP
What converts pyruvate into acetyl CoA, to do substrate level phosphorylation?
is acetyl CoA gluconogenic?
-PDH (pyruvate dehydrgenase)
-acetyl CoA is not gluconogenic, it cant be converted to go back to glucose form
What process produces ATP?
How does mitchondria particpate in cell signaling and in synthesis of heme and iron?
-Oxidative phosphorylation in mitochondria produces most of the ATP used by eukaryotic cells
-synthesis of heme/iron=These metal-containing components (carrier electrons) are synthesized in mitochondria and play a central role in respiration and other cellular processes
-cell signaling=Mitochondria buffer the concentration of Ca2+, an ion that plays a role in many signaling processes, including muscle contraction
How does mitochondria regulate apoptosis?
How are reactive oxygen species involved in mito.
-Molecules released from mitochondria trigger a proteolytic cascade that leads to cell death
-Although reactive oxygen species can damage macromolecules, they are also involved in signaling