In 2005, a new species of green sulfur bacteria was discovered near a geothermal vent at the bottom of the ocean. An exceptionally efficient light-harvesting mechanism allows these bacteria to carry out photosynthesis where the only illumination is a dim volcanic glow emanating from the vent. Cell membrane are required for electron transfer chains in the light-dependent reactions. but these bacteria have no internal membranes. How do you think they carry out the light-dependent reactions?

In 2005, a new species of green sulfur bacteria was discovered near a geothermal vent at the bottom of the ocean. An exceptionally efficient light-harvesting mechanism allows these bacteria to carry out photosynthesis where the only illumination is a dim volcanic glow emanating from the vent. Cell membrane are required for electron transfer chains in the light-dependent reactions. but these bacteria have no internal membranes. How do you think they carry out the light-dependent reactions?

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter20: The Protists

Section: Chapter Questions

Problem 4CT: Melvin Calvin and Andrew Benson determined the steps in the light-independent reactions of...

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Melvin Calvin and Andrew Benson determined the steps in the light-independent reactions of photosynthesis by exposing the green alga Chlorella to CO2 labeled with the radioisotope carbon 14. By looking at which compounds the C14 ended up in, they were able to identify all intermediates in this cyclic pathway. Why did they predict correctly that the same set of intermediates would be formed in the light reaction in land plants?
in 2005, a new species of green sulfur bacteria wasdiscovered near a geothermal vent at the bottom of the ocean. An exceptionally efficient light-harvesting mechanism allows these bacteria to carry out photosynthesis where the only illumination is a dim volcanic glow emanating from the vent. Cell membranes are required for electron transfer chains in the light-dependent reactions, but these bacteria have no internal membranes. How do you think they carry out the light-dependent reactions?
When electron gradients are created in photosythesis and cellular respiration, the electrons are attatched to a proton, so why does it still have a negative charge?
Is water the only possible electron donor in photosynthesis? Why or why not?
Why is it true that the electrons from photolysis are absolutely required for photosynthesis?
Which of the following structures is not a component of a photosystem? a. ATP synthase b. antenna molecule c. reaction center d. primary electron acceptor
Excited electrons (and hydrogen ions) in Photosystem 2 go through an electron transport system, but these electrons (and hydrogen ions) must be replaced in the pigments. How are these electrons (and hydrogen ions) replaced? In other words, what is the ultimate origin of these electrons (and hydrogen ions) and what is the important byproduct of the reaction that provides these electrons (and hydrogen ions)?
When researchers shifted isolated chloroplasts from a low pH solution to a more alkaline (higher pH) solution, ATP synthesis occurred even in the absence of light! This was an experiment used to support the chemiosmosis mechanism of ATP formation in chloroplasts. Why?
The 2nd stage of photosynthesis is termed as light-independent reaction? Why?
Photosynthesis in green and purple bacteria does not produce O2. Why? How can these organisms still use photosynthesis to produce ATP? What molecules serve as electron donors in these organisms?
what is the process called that provides the energy to pump protons during the light dependent reactions of photosynthesis? which direction are protons pumped?
Why is the carbon dioxide concentration a limiting factor of the photosynthesis process? When the carbon dioxide concentration is increased indefinitely is photosynthesis also increased indefinitely?