Where does the oxygen for the synthesis of the water come from?

Where does the oxygen for the synthesis of the water come from?

Most of this oxygen comes from tiny ocean plants – called phytoplankton – that live near the water’s surface and drift with the currents. Like all plants, they photosynthesize – that is, they use sunlight and carbon dioxide to make food. A byproduct of photosynthesis is oxygen.

Which of the following processes require molecular oxygen o2?

Efficiency of ATP production

Step coenzyme yield ATP yield
Glycolysis preparatory phase −2
Glycolysis pay-off phase 4
2 NADH 3 or 5
Oxidative decarboxylation of pyruvate 2 NADH 5

Why is oxygen needed in electron transport chain?

Why is oxygen essential for the electron transport chain? Explanation: Oxygen serves as the terminal electron acceptor for the electron transport chain. Electrons are donated by NADH molecules and passed through several different proteins to generate the proton gradient in the intermembrane space.

Why is oxygen required for ATP synthesis?

Why oxygen? Oxygen is the final electron acceptor at the end of the electron transport chain of aerobic respiration. In the absence of oxygen, only a few ATP are produced from glucose. In the presence of oxygen, many more ATP are made.

What is the source of the oxygen used to form water in the complete reactions of cellular respiration?

Photosynthesis makes the glucose that is used in cellular respiration to make ATP. The glucose is then turned back into carbon dioxide, which is used in photosynthesis. While water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.

Where does water come from in cellular respiration?

Water is formed when hydrogen and oxygen react to form H2O during the electron transport chain, which is the final stage of cellular respiration.

What is the ultimate fate of oxygen gas O2 in cellular respiration?

What is the ultimate fate of the atoms in oxygen gas (O2) in cellular respiration? Generate a proton gradient. In the process of aerobic metabolism, carbon-containing molecules are broken down and the energy from the electrons is used to ____. Which answer best describes energy flow in biological systems?

Why is oxygen important in oxidative phosphorylation?

In oxidative phosphorylation, oxygen must be present to receive electrons from the protein complexes. This allows for more electrons and high energy molecules to be passed along, and maintains the hydrogen pumping that produces ATP.

Why is oxygen needed?

Most living things need oxygen to survive. Oxygen helps organisms grow, reproduce, and turn food into energy. Humans get the oxygen they need by breathing through their nose and mouth into their lungs. Oxygen gives our cells the ability to break down food in order to get the energy we need to survive.

Where do you think the oxygen molecules come from?

Oxygen is generated during photosynthesis by plants and many types of microbes. Plants both use oxygen (during respiration) and produce it (via photosynthesis). Oxygen can also form a molecule of three atoms, which is known as ozone (O3).

Which of the following reactions produces the oxygen released by photosynthesis?

light-dependent reactions
The Two Parts of Photosynthesis 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 light-dependent reactions release oxygen from the hydrolysis of water as a byproduct.

What is the role of oxygen in photosynthesis and in cellular respiration?

In photosynthesis, solar energy is harvested as chemical energy in a process that converts water and carbon dioxide to glucose. Oxygen is released as a byproduct. In cellular respiration, oxygen is used to break down glucose, releasing chemical energy and heat in the process.

Why is the formula for oxygen written as O2?

Oxygen is written as O2 when there are two oxygen atoms in the molecule. Pure oxygen doesn’t generally exist as individual atoms, two oxygen atoms bond together to form an oxygen molecule.

How is oxygen produced in the atmosphere?

Molecular oxygen (O2) is generated and consumed by a wide span of biological and abiotic processes. Chief among these are photosynthesis and respiration, but on geologic timescales, burial and weathering of redox-active elements such as carbon and sulfur exert strong controls on atmospheric O 2 concentrations.

What affects the concentration of dissolved oxygen in surface water?

As the chart shows, the concentration of dissolved oxygen in surface water is affected by temperature and has both a seasonal and a daily cycle. Cold water can hold more dissolved oxygen than warm water.

Why does oxygen form bonds with other atoms?

This is because oxygen is highly reactive, disconnected atoms have a very strong tendency to form bonds. If there’s nothing else available, they’ll bond to each other.