Some of the electron transport carriers (the cytochromes) absorb light at characteristic wavelengths when they are carrying the extra electron from NADH but not when they give up the electrons to the next carrier. Thus, light absorption bands are all present when mitochondria are incubated in the absence of oxygen or when tyanide is present. Cyanide blocks the transfer of electrons from the last cytochrome to oxygen. When cyanide is absent and oxygen is introduced, the cytochromes stop absorbing light. There are three cytochromes in animal mitochondria, called a, b, and c. Another inhibitor of mitochor rial electron transfer is urethane. When urethane is added to aerobic mitochondria, cytochrome b begins to absorb light, but a and c do not. Finally, purified cytochrome c, even in the presence of oxygen, continues to absorb light. Use these observations to decide the order in which the cytochromes occur in the mitochondria.
Some of the electron transport carriers (the cytochromes) absorb light at characteristic wavelengths when they are carrying the extra electron from NADH but not when they give up the electrons to the next carrier. Thus, light absorption bands are all present when mitochondria are incubated in the absence of oxygen or when tyanide is present. Cyanide blocks the transfer of electrons from the last cytochrome to oxygen. When cyanide is absent and oxygen is introduced, the cytochromes stop absorbing light. There are three cytochromes in animal mitochondria, called a, b, and c. Another inhibitor of mitochor rial electron transfer is urethane. When urethane is added to aerobic mitochondria, cytochrome b begins to absorb light, but a and c do not. Finally, purified cytochrome c, even in the presence of oxygen, continues to absorb light. Use these observations to decide the order in which the cytochromes occur in the mitochondria.
Biochemistry
6th Edition
ISBN:9781305577206
Author:Reginald H. Garrett, Charles M. Grisham
Publisher:Reginald H. Garrett, Charles M. Grisham
Chapter21: Photosynthesis
Section: Chapter Questions
Problem 5P: The Relative Efficiency of ATP Synthesis in Noncyclic versus Cyclic Photophosphorylation If...
Related questions
Question
Expert Solution
Step 1
Introduction
The electron transport chain (ETC) is a series of protein complexes and electron carriers located in the inner mitochondrial membrane of eukaryotic cells or in the plasma membrane of prokaryotes. The ETC is a key component of aerobic respiration, which is the process by which cells convert nutrients into energy in the presence of oxygen.
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Recommended textbooks for you
Biochemistry
Biochemistry
ISBN:
9781305577206
Author:
Reginald H. Garrett, Charles M. Grisham
Publisher:
Cengage Learning
Biochemistry
Biochemistry
ISBN:
9781305577206
Author:
Reginald H. Garrett, Charles M. Grisham
Publisher:
Cengage Learning