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12 Φεβ 2017 · Plants produce ATP during photosynthesis in the chloroplast in addition to the ATP they generate through cellular respiration in mitochondria. The process is again similar: during photosynthesis, light energy excites electrons, which flow down an electron transport chain, which in turn allows H + ions to travel through a membrane in the ...
14 Μαΐ 2022 · Chemiosmosis in Chloroplasts. The energy released as electrons pass down the gradient between photosystem II and plastocyanin (PC) is harnessed by the cytochrome b 6 /f complex to pump protons (H +) against their concentration gradient from the stroma of the chloroplast into the interior of the thylakoid (an example of active transport). As ...
8 Σεπ 2023 · In biology, chemiosmosis refers to the process of moving ions (e.g. protons) to the other side of a biological membrane, and as a result, an electrochemical gradient is generated. This can then be used to drive ATP synthesis.
Plants have egg cells, much like animals, and the egg cell is the sole source of organelles for the zygote that leads, eventually, to an adult plant. The plastids found in the egg are called ‘proplastids’ and are the progenitors of all the other plastids (regardless of type) found in the mature plant ( Wise, 2006 ).
This flow of hydrogen ions through ATP synthase is called chemiosmosis because the ions move from an area of high to an area of low concentration through a semi-permeable structure. In cyclic photophosphorylation, cytochrome b6f uses the energy of electrons from both PSII and PSI to create more ATP and to stop the production of NADPH.
7 Οκτ 2024 · Explore how chemiosmosis and proton gradients drive energy conversion in cells, highlighting their roles in mitochondria and photosynthesis. Understanding how life sustains itself at the cellular level is central to biology. Chemiosmosis, a pivotal mechanism in energy conversion, plays a crucial role in this process.
Importance. Chemiosmosis in chloroplasts is the source of ATP molecules for dark reactions of photosynthesis. If the chemiosmotic process fails to make ATP molecules, the dark reactions cannot proceed, and the organisms fail to manufacture glucose. This chemiosmotic process holds the primary importance in the process of photosynthesis.
