CH 7 SG Flashcards
Cellular respiration
A series of metabolic reactions that use the energy from carbohydrate fatty acid or amino acid breakdown to produce ATP molecules (mitochondria/cytoplasm(glycolysis))
How are breathing and cellular respiration are related?
a cellular process that produces energy, while simultaneously removing the waste product carbon dioxide, which is then exhaled
Chemical equation for cellular respiration
C6H12O6 + 6O2 ———> 6CO2 + 6H2O + ~32 ATP
Chemical equation for photosynthesis
6CO2 + 6H2O —sunlight/photosynthesis—> C6H12O6 + 6O2
ATP
Nucleotide with three phosphate groups, the breakdown of ATP into ADP plus P makes energy available for energy-requiring processes and cells
What are the anaerobic processes for extracting energy from food?
fermentation and digestion are methods organisms use to extract energy from food without oxygen
reactants, products, and energy yield of alcohol fermentation
It breaks down sugars, like glucose, into ethyl alcohol and CO2, yielding only 2 ATP per glucose molecule, in contrast to the higher energy output of aerobic respiration
What role does oxygen play in the electron transport chain?
(oxygen drives the electrons chain/the oxygen is electronegative, therefore it pulls electrons through the chain)
It acts as the final electron acceptor
Great Oxidation Event (GOE)
(cyanobacteria releasing oxygen into the atmosphere) geological shift in Earth’s atmosphere that happen 2 to 2.5 billion years ago (the transition from an oxygen-free atmosphere to one with a small amount of oxygen) (early life was anaerobic)
photosynthesis
plants convert light energy into chemical energy (sugars) using water and carbon dioxide, occurring in organelles - chloroplasts within plant cells, specifically in the mesophyll tissue of leaves
NADPH
anabolic pathways (photosynthesis)
- a chemical compound that helps cells build molecules and maintain redox balance
NADH
catabolic pathways (cell respiration)
- nicotinamide adenine dinucleotide (NAD) + hydrogen (H).” It occurs naturally in the body and plays a role in generating energy
FADH2
Krebs cycle only (cell respiration)
- (flavin adenine dinucleotide) coenzyme helps transport electrons during cellular respiration
What are the aerobic processes for extracting energy from food?
(for extracting energy from food cellular respiration) involves glycolysis, citric acid cycle, all requiring oxygen to efficiently convert food molecules into usable energy - ATP
reactants, products, and energy yield of lactic acid fermentation
glucose and glycolysis-produced pyruvate, which are converted to lactic acid as a product, with a net energy yield of 2 ATP molecules per glucose molecule
Light reactions
of photosynthesis generate energy carriers, which in turn drive the manufacture of sugars via the Calvin cycle
Main 3 stages of Cellular Respiration:
- glycolysis
- citric acid cycle (or Kreb’s cycle)
- electron transport** (most ATP)
anaerobic
(“without oxygen”) some of your cells can work for short periods without oxygen
Fermentation
(Can make ATP w/o oxygen/harvest of food energy) This relies on glycolysis, the first stage of cellular respiration.
•Produces 2 ATP per glucose.
To harvest food energy during glycolysis…
NAD+ must be present to receive electrons.
–Must anaerobically recycle NADH back to NAD+.
Wastes from fermentation can be…, depending on the species.
ethyl alcohol, lactic acid, or other compounds
Anaerobic digestion
a biological process that breaks down organic materials without oxygen
Energy carriers store energy in…
loosely bounded electrons and hydrogen atoms
The overall effect of all this transfer of electrons during cellular respiration…
is a “downward” trip for electrons