Photosynthesis is an endergonic (that is, requiring an input of energy to proceed) series of reactions that uses energy from the sun to convert carbon dioxide in the atmosphere to carbon-containing molecules that can be used as fuel. The photosynthesis formula is the reverse of respiration's.
Photosynthesis occurs in two stages. In the first stage, light-dependent reactions or light reactions capture the energy of light and use it to make the energy-storage molecules ATP and NADPH. During the second stage, the light-independent reactions use these products to capture and reduce carbon dioxide.
Photosynthesis is the conversion of light energy into chemical energy by living organisms. The raw materials are carbon dioxide and water; the energy source is sunlight; and the end-products are oxygen and (energy rich) carbohydrates, for example sucrose, glucose and starch.
A photosynthetic reaction center is a complex of several proteins, pigments and other co-factors that together execute the primary energy conversion reactions of photosynthesis.Molecular excitations, either originating directly from sunlight or transferred as excitation energy via light-harvesting antenna systems, give rise to electron transfer reactions along the path of a series of protein ...
There are 3 basic types of photosynthesis: C 3, C 4, and CAM. Each has advantages and disadvantages for plants living in different habitats. All 3 forms of photosynthesis are based on two pathways. The first are the light reactions, where energy from the sun is absorbed by the chlorophyll of the plant, and the energy is transferred to hydrogen ...
The process of photosynthesis is commonly written as: 6CO 2 + 6H 2 O → C 6 H 12 O 6 + 6O 2.This means that the reactants, six carbon dioxide molecules and six water molecules, are converted by light energy captured by chlorophyll (implied by the arrow) into a sugar molecule and six oxygen molecules, the products. The sugar is used by the organism, and the oxygen is released as a by-product.
The light reactions of photosynthesis use energy from photons to generate high-energy electrons (Figure 19.2). These electrons are used directly to reduce NADP + to NADPH and are used indirectly through an electron-transport chain to generate a proton-motive force across a membrane.
The preceding reactions are examples of other types of reactions (such as combination, combustion, and single-replacement reactions), but they’re all redox reactions. They all involve the transfer of electrons from one chemical species to another. Redox reactions are involved in combustion, rusting, photosynthesis, respiration, batteries, and ...
Chapter 8 Bio. STUDY. PLAY. Terms in this set (...) Metabolism. ... Which reactions are considered "uphill"? Anabolic. What type of reaction is photosynthesis? Anabolic. What type of reaction is cellular respiration? Catabolic. Which reactions require enzymes to catalyze reactions? Anabolic.
Photosynthesis is the process used by plants, algae and certain bacteria to harness energy from sunlight and turn it into chemical energy. Here, we describe the general principles of ...