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Section 6.3

Section 6.3. Bailey Mills Kelsey Nau. What is ATP?. Contains sugar ribose Acts as immediate source of energy that powers cellular work One of the nucleoside triphosphates used to make RNA. 3 kinds of work in a cell.

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Section 6.3

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  1. Section 6.3 Bailey Mills Kelsey Nau

  2. What is ATP? • Contains sugar ribose • Acts as immediate source of energy that powers cellular work • One of the nucleoside triphosphates used to make RNA

  3. 3 kinds of work in a cell • Chemical work- pushing of endergonic reactions that would not occur spontaneously • Transport work- the pumping of substances across membranes against the direction of spontaneous movement • Mechanical work- the contraction of muscle cells, and the movement of chromosomes during cellular reproduction

  4. ATP to ADP • Hydrolysis breaks bonds • Addition of water molecule • Molecule of inorganic phosphate leaves ATP

  5. How ATP is used • Transports chemical energy within cells • One end product of cellular respiration • Used by enzymes and proteins in many cellular processes (cell division) • Energy released is greater than the energy most molecules could deliver • Release of energy heats surrounding environment. EX: (shivering)

  6. How ATP is used cont… • Heat alone is an inefficient use of valuable energy resource • Proteins harness energy to perform the 3 types of cellular work (chemical, transport, and mechanical) • Transport and mechanical work are almost always powered by the hydrolysis of ATP

  7. Regeneration of ATP • Addition of phosphate to ADP • ATP cycle- shuttling of inorganic phosphate and energy • Couples energy-yielding processes to energy consuming ones • Free energy must be spent to make it occur • Regeneration of ATP from ADP is endergonic (energy consuming)

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