Where did the ATP come from in cellular respiration?

Although cells continuously break down ATP to obtain energy, ATP also is constantly being synthesized from ADP and phosphate through the processes of cellular respiration. Most of the ATP in cells is produced by the enzyme ATP synthase, which converts ADP and phosphate to ATP.

Where does the first ATP come from?

The Earliest Cells Probably Produced ATP by Fermentation In the process of fermentation, ATP is made by a phosphorylation event that harnesses the energy released when a hydrogen-rich organic molecule, such as glucose, is partly oxidized (see Figure 2-72).

Where does the first part of cellular respiration occur how much ATP is produced?

This process occurs in the cytoplasm of the cell, and it occurs in the presence or absence of oxygen. During glycolysis a small amount of NADH is made as are four ATP. Two ATP are used during this process, leaving a net gain of two ATP from glycolysis.

What is the first process of cellular respiration and how many ATP are produced?

The process of producing cellular energy involving oxygen. Cells break down food in the mitochondria in a long, multi-step process that produces roughly 36 ATP. The first step in is glycolysis, the second is the Krebs cycle and the third is the electron transport system.

Where does cellular respiration take place in the cell?

mitochondria
While most aerobic respiration (with oxygen) takes place in the cell’s mitochondria, and anaerobic respiration (without oxygen) takes place within the cell’s cytoplasm.

Who discovered cellular respiration?

Thomas Adams
Cellular respiration is the process that takes place in the cells of the organism to convert the biochemical energy from nutrients into ATP. It includes breaking down sugar in the presence of oxygen. The cellular respiration was discovered by Thomas Adams.

When did cellular respiration evolve?

The origin of oxygenic photosynthesis in Cyanobacteria led to the rise of oxygen on Earth ~2.3 billion years ago, profoundly altering the course of evolution by facilitating the development of aerobic respiration and complex multicellular life.

Where in the body is ATP produced?

Mitochondria
Mitochondria are the main site for ATP synthesis in mammals, although some ATP is also synthesized in the cytoplasm. Lipids are broken down into fatty acids, proteins into amino acids, and carbohydrates into glucose.

Where does each step of cellular respiration occur?

The Location of Cellular Respiration Cellular respiration takes place in both the cytosol and mitochondria of cells. Glycolysis takes place in the cytosol, whereas pyruvate oxidation, the Krebs cycle, and oxidative phosphorylation occur in the mitochondrion.

Where does the second stage of cellular respiration occur?

Stage 2: The Krebs Cycle The pyruvate molecules from glycolysis next enter the matrix of a mitochondrion. That’s where the second stage of cellular respiration takes place. This stage is called the Krebs cycle. During this stage, two more molecules of ATP are produced.

Where does the first stage of cellular respiration occur?

Glycolysis
Glycolysis: The Foundation of Cellular Respiration Glycolysis, the first step of cellular respiration, occurs in the cytoplasm of your cells. During this process, a glucose molecule is broken down into two molecules of pyruvate (pyruvic acid).

Where does cellular respiration take place in eukaryotic cells?

Glycolysis takes place in the cytoplasm of both prokaryotic and eukaryotic cells. If oxygen is available, aerobic respiration will go forward. In eukaryotic cells, the pyruvate molecules produced at the end of glycolysis are transported into mitochondria, which are the sites of cellular respiration.