11 Questions
Hva er en koblet reaksjon?
En reaksjon som frigjør energi og driver en annen reaksjon som krever energi
Hva er hovedfunksjonen til adenosintrifosfat (ATP) i celler?
Lagre og transportere kjemisk energi
Hva kreves for produksjon av ATP fra ADP og et fosfatmolekyl?
Energi fra nedbrytningen av glukose
Hva er katabolisme i celler?
Nedbrytningsprosessen hvor enzymer bryter ned komplekse organiske molekyler
Hva er formålet med matmoleklenes nedbrytning i cellene?
Enten brukt for energi eller som byggesteiner for andre organiske molekyler
Hva er hovedfunksjonen til enzymer i nedbrytningen av glukose?
Å øke hastigheten på kjemiske reaksjoner
Hvor foregår oksidativ fosforylering i eukaryote celler?
I mitokondrielle membranen
Hva er hovedfunksjonen til aktive bærere som ATP og NADH i cellen?
Midlertidig lagre og transportere energi
Hvorfor frigjøres energien fra glukose gradvis ved nedbrytning i cellen?
For å forhindre tap av energi
Hvilken type sukker bruker cellene som energikilde for nedbrytning?
Glukose
Hvor brukes energien fra aktive bærere for å drive syntesen av ATP?
I mitokondrielle membranen
Study Notes
Cell Respiration
- Cell respiration is the process of breaking down sugar to produce energy.
ATP Production
- There are two ways to produce ATP:
- Directly through enzymatic reactions that break down molecules from food, which are energy-favorable reactions that produce ATP and active carriers.
- Through oxidative phosphorylation, which takes place in the mitochondrial membrane of eukaryotic cells or in the plasma membrane of aerobic prokaryotes, using energy from active carriers to drive ATP synthesis.
Cellular Respiration
- In living cells, glucose (a type of sugar used as an energy source) is broken down in several stages with the help of enzymes, which catalyze chemical reactions without being consumed in the process.
- The breakdown of glucose releases energy, but instead of releasing it all at once (which would be inefficient and potentially harmful), the energy is released gradually through a series of chemical reactions.
- In these reactions, the energy released from glucose is transferred to "active carriers" (often ATP and NADH), which can temporarily store and transport energy within the cell.
Active Carriers
- Active carriers are molecules that can temporarily store and transport energy within the cell, such as adenosine triphosphate (ATP).
- ATP is produced when energy from glucose breakdown is transferred to adenosine diphosphate (ADP) and a phosphate molecule (Pi), a process that requires energy.
- This energy comes from the energy-favorable reactions in glucose breakdown, making it possible to produce ATP.
Katabolism
- Katabolism is the breakdown process where enzymes break down complex organic molecules into simpler molecules.
- This process occurs in three stages, involving the breakdown of protein, fat, and polysaccharides, which make up most of the food we eat.
Learn about cell respiration and how the oxidation of sugar produces energy in cells. Explore the two ways in which ATP can be formed and understand the processes involved in generating ATP through direct coupling with enzymatic reactions and oxidative phosphorylation.
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