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?

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)?

What process is shown in the figure below? 3 Molecules CO2 RuBisCO Stage 1: carbon fixation 3 ADP 6 ATP ЗАТР 6 ADP Stage 3: regeneration of RUBP Stage 2: reduction 6 NADPH - 6 NADP*+ H* Sugar O Glycolysis O Light reactions of photosynthesis Oxidative phosphorylation Citric Acid Cycle O Dark reactions of photosynthesis

What is the process of damaging of photosynthetic pigments at very high temperature?

Under conditions of very high light intensity, excess absorbed solar energy is dissipated by the action of photoprotective proteins in the thylakoid membrane. Explain why it is advantageous for these proteins to be activated by buildup of the proton gradient across the membrane.

Which of the following statements about the light reactions of photosynthesis are correct?   1. Absorption of light does one thing: it makes chlorophyll easier to oxidize. 2. In PSII, the rate of damage to the D1 protein can never exceeds the rate of repair. 3. Electron transport is spontaneous (exergonic) as electrons move from P680* to P700+. 4. Compared to anoxygenic photosynthesis, in oxygenic photosynthesis less light needs to be absorbed to reduce NADP+.   A.  1,2 and 3   B.  1 and 3   C.  2 and 4   D.  4 only   E. All of 1,2,3 and 4 are correct

The Calvin cycle reactions are sometimes called the “lightindependent reactions” or “dark reactions” to contrast them with the light (or light-dependent) reactions. Can the Calvin cycle be sustained in algae that are kept in total darkness for several days? Why or why not

22. A process called takes place in the dark phase of photosynthesis. a) When does this phenomenon take place? b) What happens during the dark phase? c) What would be the consequences if there was no dark phase dormancy of the photosynthesis?

Place numbers beside the statements below to indicate the order of events occurring in the light reactions.   I know for sure that 1 and 8 are correct, but the rest I’m not too confident about. I attached both my work and a blank copy.

A scientist is using a species of green algae to study electron transport chain in photosynthesis. He uses a laser to inactivate all of chlorophyll A in the algae, but leaves chlorophyll B intact (case 1). In a separate experiment, the scientist applies a chemical to the algae that inhibits PS I but does not affect PS II (case 2).    Which of the following results is expected? In case 1, only PS I completely loses function; in case 2, no proton gradient is produced. In case 1, only PS I completely loses function; in case 2, a proton gradient is still produced. In case 1, both PS I and PS II completely lose function; in case 2, no proton gradient is produced. In case 1, both PS I and PS II completely lose function; in case 2, a proton gradient is still produced.