Embedded in the thylakoid membrane are molecules of chlorophyll, a pigment (a molecule that absorbs light) through which the entire process of photosynthesis begins. Chlorophyll is responsible for the green color of plants. The thylakoid membrane encloses an internal space called the thylakoid space.

What controls photosynthesis?

The chemical reactions involved in photosynthesis are controlled by enzymes . As with any other enzyme-controlled reaction, the rate of photosynthesis is affected by temperature. At low temperatures, the rate of photosynthesis is limited by the number of collisions between enzymes and substrate.

What molecules cause photosynthesis?

This chemical energy is stored in carbohydrate molecules, such as sugars and starches, which are synthesized from carbon dioxide and water – hence the name photosynthesis, from the Greek phōs (φῶς), "light", and sunthesis (σύνθεσις), "putting together". In most cases, oxygen is also released as a waste product.

What organelle controls photosynthesis?

Chloroplasts, the organelles responsible for photosynthesis, are in many respects similar to mitochondria. Both chloroplasts and mitochondria function to generate metabolic energy, evolved by endosymbiosis, contain their own genetic systems, and replicate by division.

What does the lysosome do?

Lysosomes break down macromolecules into their constituent parts, which are then recycled. These membrane-bound organelles contain a variety of enzymes called hydrolases that can digest proteins, nucleic acids, lipids, and complex sugars. The lumen of a lysosome is more acidic than the cytoplasm.

Photosynthesis: Crash Course Biology #8

19 related questions found

What does a ribosome do?

Ribosomes are the sites in a cell in which protein synthesis takes place. Cells have many ribosomes, and the exact number depends on how active a particular cell is in synthesizing proteins.

What is the chemical reaction of photosynthesis?

The process of photosynthesis is commonly written as: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. 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.

Which two molecules are products of photosynthesis?

In photosynthesis, energy from light is used to convert carbon dioxide and water into glucose and oxygen. For 6 carbon dioxide and 6 water molecules, 1 glucose molecule and 6 oxygen molecules are produced.

What is biochemical phase of photosynthesis?

Photosynthesis is a complex biochemical pathway in plants, algae, and certain bacteria. This illustrates the three parts of the process: (a) the light-capturing events, (b) the light-dependent reactions, and (c) the light-independent reactions.

What enzymes control photosynthesis?

This reaction is catalyzed by the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase, much more memorably known as Rubisco. This enzyme is believed to be the most abundant protein in the world, given that it is present in all plants that undergo photosynthesis.

What factors affect photosynthesis?

Three factors can limit the rate of photosynthesis: light intensity, carbon dioxide concentration and temperature.

What do enzymes do during photosynthesis?

Explanation: Building a larger molecule from smaller molecules capture energy. Enzymes of photosynthesis capture energy of sun to build a larger molecule. This captured energy is used furthe by breaking down larger molecule in smaller molecules during glycolysis.

What molecule ultimately takes up the electrons that leave P680 and P700?

When a chlorophyll molecule absorbs the energy of a photon, that energy is transferred from chlorophyll to chlorophyll through the antenna complex until it is ultimately absorbed by the reaction centers of PSII (P680) or PSI (P700).

Which four chemicals are involved in photosynthesis?

The equation shows that the “ingredients” for photosynthesis are carbon dioxide, water, and light energy. Plants, algae, and photosynthetic bacteria take in light from the sun, molecules of carbon dioxide from the air, and water molecules from their environment and combine these reactants to produce food (glucose).

Where do the products of photosynthesis go?

The products of photosynthesis are glucose and oxygen. Glucose is stored in algae and plants in insoluble forms, while oxygen goes into the air.

How do the reactant molecules of photosynthesis reach the chloroplasts?

The reactant molecules which are water, CO2 and light reach the chloroplast in different ways: the water reaches the leaves by the help of Xylem, the xylem in found vascular bundles which consist of Xylem and phloem; the carbon dioxide reaches the chloroplast through tiny openings present on the epidermis of leaves ...

What is cytoplasm function?

Cytoplasm. The cytoplasm is the gel-like fluid inside the cell. It is the medium for chemical reaction. It provides a platform upon which other organelles can operate within the cell. All of the functions for cell expansion, growth and replication are carried out in the cytoplasm of a cell.

What is the mitochondria function?

Mitochondria are well known as the powerhouse of the cell, and as discussed in the section on Generation of ATP: Bioenergetics and Metabolism, in an active tissue such as heart, they are responsible for generating most of the ATP in the cell.

What is Golgi apparatus do?

The Golgi apparatus transports and modifies proteins in eukaryotic cells. ... The Golgi apparatus is the central organelle mediating protein and lipid transport within the eukaryotic cell.

What is ADP and NADP?

ATP - Adenosine triphosphate. ADP - Adenosine diphosphate. NADP - Nicotinamide adenine dinucleotide phosphate. NADPH - The reduced form of NADP. In the Light Dependent Processes i.e Light Reactions, the light strikes chlorophyll a in such a way as to excite electrons to a higher energy state.

What molecule is responsible for reducing p680?

Two water molecules must be split to provide electrons to reduce p680. The oxygen we breathe is a product of this water-splitting process.

Which molecules are produced during the light reactions of photosynthesis?

The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH.

How is chlorophyll involved during photosynthesis?

During photosynthesis, chlorophyll captures the sun's rays and creates sugary carbohydrates or energy, which allows the plant to grow.

What does RuBisCO do in photosynthesis?

Ribulose 1,5-bisphosphate carboxylase-oxygenase (RuBisCO) is the enzyme responsible for the fixation of carbon derived from atmospheric CO₂ as part of the Calvin-Benson cycle that leads to production of the glucose essential for growth in most photosynthetic organisms.

Is diffusion controlled by enzymes?

A diffusion-limited enzyme catalyses a reaction so efficiently that the rate limiting step is that of substrate diffusion into the active site, or product diffusion out. ... Most enzymes catalyse their reactions to a rate that is 1,000-10,000 times slower than this limit.