Cellular Respiration 4
Storyboard Text
- If Glycolysis and Krebs cycle produce each 2 ATP, how are the other ATP produced?
- What does ETC do?
- Other ATP are produced in the ETC cycle. Recall NADH that is formed from NAD+? They enter the mitochondrion and join NADH and FADH2 and their electrons are passed from all those carriers to electron transport chain(ETC).
- NADH and FADH2 pass their high energy electrons to ETC. High energy electrons are passed from one carrier to the next. At the end of the ETC is an enzyme that combines them with H ions and O to form H2O. O is the final acceptor of the chain. Without O the ETC can't function. Because it requires oxygen, ETC is called aerobic.
- ETC uses the high-energy electrons from glycolysis and the Krebs cycle to synthesize ATP from ADP.
- The cell uses a process called chemiosmosis to produce ATP. The inner mitochondrial membrane contains enzymes called ATP synthases.
- After hearing you all I am understanding that the biggest number of ATP molecules is produced during the ETC cycle.
- Every time two high energy electrons pass down the electron transport chain, their energy is used to transport H+ ions across the membrane. H+ ions build up in the intermembrane space making it positively charged, and in turn, the other side becomes negatively charged, so that the membrane itself becomes a biological battery that can power the synthesis of ATP.
- After the movement of hydrogen ions, the process of chemiosmosis happens. During this process, the charge difference across the membrane forces H+ ions through channels in ATP synthases (which are enzymes found in the inner mitochondrial membrane), causing the ATP synthase to spin. With each rotation, the enzyme grabs an ADP molecule and attaches a phosphate group, thus producing ATP.
- Thus, there are 2 ATP produced during the glycolysis, 2 ATP produced during the Krebs cycle and 34 ATP produced during the ETC.
- Can cells produce ATP without oxygen?
- Correct!!!
- Yes, in the absence of oxygen, fermentationreleases energy from food molecules byproducing ATP
- Lactic acid fermentation does not give off CO2. However, it also regenerates NAD+so that glycolysis can continue. Its chemical equation is: Pyruvic acid+NADH → Lactic acid+NAD+
- There are 2 main types of fermentation :Alcoholic fermentation and Lactic Acid fermentations. Alcoholic fermentation is carried out \by yeast, and its products are ethyl alcohol and carbon dioxide. Its chemical equation is: Pyruvic acid+NADH → Alcohol+CO2+NAD+
Over 30 Million Storyboards Created
No Downloads, No Credit Card, and No Login Needed to Try!
