As energy passes from blue-absorbing chlorophylls down to red-absorbing chlorophylls, surprisingly, no energy passes from lower energy-absorbing pigments back to higher ones (in other words, the process is irreversible). Why might that be?

A C4 plant minimizes photorespiration by (note that we are talking about standard C4 plant, not CAM plants here) O having the light reactions and carbon reactions occur in different cells, so oxygen does not come into contact with rubisco O having the light reactions and carbon reactions occur in different cells, so carbon dioxide does not come into contact with rubisco O stomata that are only opened at night, storing oxygen in malate, and releasing oxygen during the day O stomata that are only opened at night, storing carbon dioxide in malate, and releasing carbon dioxide during the day

Suppose we set up a system in a lab where plants are automatically injected with all the glucose they need to survive. What part of photosynthesis would the plants no longer need to perform? Group of answer choices a)ETC 1 b)the entire dark reaction c)the entire light reaction d)P700 e)all of it

Which (look at figure) is an accessory pigment in red flowers?

Rubisco can bind with CO2 or 02. When it binds with O2, it "wastes" some of the energy captured from the sun. This reaction is photorespiration and is favored at high temperatures and low CO2:02 ratios. Which of the following strategies should limit photorespiration (select all that apply). Keep stomata closed. Keep stomata open. Physically separate the light and light-independent reactions. Temporally separate CO2 uptake and fixation.

When considering the loading and unloading of photosynthate from the phloem, which of the following is FALSE?   Select one: a. Apoplastic phloem unloading enables the import of sugars against their concentration gradient into sink tissue. b. In apoplastic loading, the solute potential of the companion cells is more negative than the apoplastic space nearby. c. In apoplastic loading, proton pumps create electrochemical gradients that can be used by symporter proteins to import sugars into the companion cell. d. All the statements are true. e. Symplastic loading relies on diffusion of the sugars through plasmodesmata from photosynthetic cells to the phloem cells.

The substance dichlorophenyldimethylurea (DCMU) is an herbi- cide that inhibits photosynthesis by blocking electron transfer between plastoquinones in photosystem II. (a) Would you expect DCMU to interfere with cyclic photophos- phorylation? (b) Normally, DCMU blocks Oz evolution, but addition of ferri- cyanide to chloroplasts allows Oz evolution in the presence of DCMU. Explain.

If a plant is removed from its natural environment and exposed to 100 percent CO2 composed of the radioisotope 14C, which of the following will not occur? Select one: a. The rate of photorespiration will remain unchanged. b. The sugars synthesized by the plant will be radioactive. c. The oxygen released will also be radioactive. d. All the carbon molecules in the RuBP molecules will eventually become 14C. e. Rubisco will eventually contain 14C.

Phycobiliproteins are complex proteins in cyanobacteria that absorb light energy. There are three kinds of phycobiliprotein molecules used to pass light to chlorophyll: phycoerythrin-responsible for capturing green light, phycocyanin-responsible for capturing orange-red light, and allophycocyanin-responsible for capturing red light. Since light can only penetrate to certain depths in oceans, phycobiliproteins capture the light available and pass it through various pathways of phycobiliproteins until the emitted light is red, which is absorbed by chlorophyll. Use the figure below to answer the following questions. 7.5m UV 15.0m 22.5m 30.0m. 37.5m Blue Green Red O Tomemorris 2020 Creative Commons Attribution-Share Alike 4.0 International license. IR 25ft 50ft 75ft 100ft 125ft a. Explain the relationship between chlorophyll absorption and wavelength. b. In addition to the pigments commonly associated with photosynthesis, a certain photosynthetic species contains two additional pigment…

Which of the following lists the stages of the Calvin cycle in order, starting with the stage where carbon dioxide is added? PGAL synthesis → carbon fixation → light reactions → regeneration of RuBP carbon fixation → PGAL synthesis → regeneration of RuBP regeneration of RuBP → carbon fixation → PGAL synthesis photorespiration → PGAL synthesis → regeneration of RuBP → carbon fixation