I have 2 biology questions I really need help with, they are due tommorow and I don't know if I'm right.
1)As an energy carrier, ATP differs from NADPH in that:
a)ATP carries less energy than NADPH.
b)ATP transfers energy through redox reactions whereas NADPH uses phosphorylation.
c)NADPH is involved in a larger variety of chemical reaction than ATP.
d)NADPH is made by Photosystem I whereas ATP is made by Photosystem II.
I'm pretty sure it's B, is that correct?
2) Which of the following statements best describes the function of the electron chain (ETC) in photosynthesis?
A)as electrons move through the etc, they release energy that is used to concentrate protons in the thylakoid lumen.
B)as electrons move through through the etc, they catalyze the formation of ATP.
c)the etc releases C02 from glucose
d)the etc captures and stores the electrons given off by NADPH
I know it's not B and I'm leaning towards A. Is this right? Thank you so much, this is really stressing me out.
1) To answer the first question, let's break down the options:
a) ATP carries less energy than NADPH: This statement is incorrect. ATP and NADPH both carry energy, but they differ in the type of energy they carry.
b) ATP transfers energy through redox reactions whereas NADPH uses phosphorylation: This statement is correct. ATP transfers energy through redox reactions, where electrons are transferred between molecules, whereas NADPH uses phosphorylation, where a phosphate group is added to a molecule, typically converting NADP+ to NADPH.
c) NADPH is involved in a larger variety of chemical reactions than ATP: This statement is incorrect. ATP is involved in a wide variety of chemical reactions as the primary energy currency in cells.
d) NADPH is made by Photosystem I whereas ATP is made by Photosystem II: This statement is incorrect. NADPH is primarily produced by Photosystem I during the light-dependent reactions of photosynthesis, while ATP is primarily produced by Photosystem II.
Based on the explanations given, the correct answer is indeed option b) ATP transfers energy through redox reactions whereas NADPH uses phosphorylation.
2) Moving on to the second question, let's evaluate the options:
A) As electrons move through the ETC, they release energy that is used to concentrate protons in the thylakoid lumen: This statement is correct. The electron transport chain (ETC) in photosynthesis involves the movement of electrons along a series of protein complexes, which leads to the release of energy. This energy is used to pump protons from the stroma into the thylakoid lumen, creating a proton gradient that is essential for ATP synthesis.
B) As electrons move through the ETC, they catalyze the formation of ATP: This statement is incorrect. While the movement of electrons through the ETC ultimately leads to the synthesis of ATP, it does not directly catalyze ATP formation.
C) The ETC releases CO2 from glucose: This statement is incorrect. The electron transport chain is not involved in the release of CO2 from glucose. CO2 release occurs during the process of cellular respiration, which is separate from photosynthesis.
D) The ETC captures and stores the electrons given off by NADPH: This statement is incorrect. NADPH is not involved in the electron transport chain itself. NADPH is primarily produced during the light-dependent reactions of photosynthesis and is used as a reducing agent in various processes, but it does not directly provide electrons to the ETC.
Therefore, the correct answer is indeed option A) As electrons move through the ETC, they release energy that is used to concentrate protons in the thylakoid lumen.
I hope this helps clarify your understanding of these concepts. If you have any further questions, feel free to ask!