Put simply, water evaporates from the land and sea, which eventually returns to Earth as rain and snow. Climate change intensifies this cycle because as air temperatures increase, more water evaporates into the air. … Still more evaporation from the soil and an increased risk of drought. What are theRead More →
The two processes are similar in that they both produce energy, albeit in two different forms. They are different in that photosynthesis assembles the glucose molecule, while cellular respiration takes it apart. Does photosynthesis require cellular respiration? Photosynthesis and cellular respiration are complementary biochemical reactions. Photosynthesis requires the products ofRead More →
In the light-dependent reactions, which take place at the thylakoid membrane, chlorophyll absorbs energy from sunlight and then converts it into chemical energy with the use of water. … The lower energy form, NADP+, picks up a high energy electron and a proton and is converted to NADPH. In whichRead More →
NADPH and ATP are produced. NADPH and ATP are used. Oxygen gas is released. Water is split. What is the splitting of water molecules called? You will find out that water is made up of hydrogen and oxygen atoms, and that we can split the atoms in a water moleculeRead More →
Plants, algae, and a group of bacteria called cyanobacteria are the only organisms capable of performing photosynthesis (Figure 1). Because they use light to manufacture their own food, they are called photoautotrophs (literally, “self-feeders using light”). Can unicellular organisms photosynthesize? Unicellular organisms use photosynthesis to make food, but multicellular onesRead More →
During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil. Within the plant cell, the water is oxidized, meaning it loses electrons, while the carbon dioxide is reduced, meaning it gains electrons. This transforms the water into oxygen and the carbon dioxide into glucose.Read More →
Previously, scientists believed that anoxygenic evolved long before oxygenic photosynthesis, and that the earth’s atmosphere contained no oxygen until about 2.4 to 3 billion years ago. … This is also long before cyanobacteria — microbes that were thought to be the first organisms to produce oxygen — existed. What cameRead More →
Hemiparasites may be facultatively parasitic only; they derive water and minerals from their hosts, as well as nutrients, but have retained some of their photosynthetic ability. Holoparasites are obligate parasites that have lost all chlorophyll, and that cannot assimilate carbon and inorganic nitrogen on their own. What is an obligateRead More →
The flow of electrons through cytochrome bf pumps protons into the thylakoid lumen. What would happen if the thylakoid membrane was permeable to protons? If the thylakoid plant membrane was readily permeable to protons, ATP synthesis would be decreased in the thylakoid. How many proton pumps are present in thylakoidRead More →
The thylakoids themselves contain the chlorophyll, but the thylakoid membrane, which is the layer that surrounds the thylakoid, is where the light reactions take place. Embedded in the thylakoid membrane are two photosystems, named photosystem I and photosystem II. Why is chlorophyll in the thylakoid membrane? Light-dependent reactions happen inRead More →