Im having a hard time understanding any of these from my test review, any help o
ID: 219115 • Letter: I
Question
Im having a hard time understanding any of these from my test review, any help owuld be great thank you!
1. True or False: ETCs generate chemical energy by transporting electrons from one side of a membrane to the other side of a membrane creating an electrical potential. Explain your answer.
2. True or False: The majority of the dry weight of a tree is derived directly from minerals and nutrients absorbed by the roots. Explain your answer.
3. Ubiquinone and Cytochrome C are electron carriers that shuttle electrons between complexes of the electron transport chain. Could the same carrier molecule be used to transfer electrons between all the complexes of the electron transport chain? Why or why not?
4. True or False: Plants have chloroplasts to produce energy and therefore can live without mitochondria. Explain your answer.
5. Unlike mitochondria, chloroplasts do not have ATP transporters to export ATP to the cytoplasm. How do plates obtain the ATP they need to power normal cell functions?
6. Root cells of plates do not receive light energy and lack chloroplasts. How do these cells survive and undergo normal cell processes?
7. It requires the removal of 4 electrons to convert 2 molecules of water to one O2 molecule. Why is it important for water splitting enzyme of photosystem II to tightly bind partially oxidized water molecules?
8.If voltage is applied to two electrodes immersed in water, water molecules will split to form H2 and O2 gas. At the negative electrode, electrons are donated from water and H2 gas is formed; at the positive electrode, electrons are accepted and O2 gas is released. When water is split during photosynthesis, O2 gas is formed, but not H2 gas. Explain why.
Explanation / Answer
Answer 1 - TRUE
Transporting electrons from one end to other end of chain leads to various chemical reactions and some of which helps in moving the hydrogen ions across the mitochondrial membrane, thus creating the electric potential. This electric potential is used for driving the ATP synthesis.
Answer 2 - False
Majority of dry weight of plants is made from the products of photosynthesis. Minerals absorbed from the soil are just used in the synthesis of complex molecules from the products of photosynthesis. For example Magnesium ion present in chlorophyll molecule.