Lecture_4_Cellular_Resp_part1 - Biology 230 Jennifer...

Unformatted text preview: Biology 230 Jennifer Breckler Cellular respiration, part 1 Chapter 9, Campbell 8e Main Concepts of cellular respiration: • Animals and other eukaryotes use cellular respiration which uses fuel (i.e. organic molecules such as sugar) to obtain the chemical energy needed for work. • Cellular respiration consists of 3 main processes: glycolysis, citric acid cycle and oxidative phosphorylation (which consists of electron transport & chemiosmosis). These last 2 occur in the mitochondrion. • Cellular respiration includes a series of energy transfers of electrons known as redox reactions • Cellular respiration produces chemical energy mainly in the form of ATP molecules by either substrate-level phosphorylation or oxidative phosphorylation Helpful vocabulary terms. You should learn them. Each term is a ‘concept’ we will cover. • Catabolic vs. anabolic pathways • chemical energy • redox reactions • electron acceptor molecules • glycolysis • oxidative phosphorylation • cellular respiration To obtain energy, we use catabolic pathways to make ATP (i.e. pathways that break down foods like glucose to yield ‘energy’ for making ATP). These pathways include: 1) Cellular respiration (involves 3 pathways---- glycolysis, citric acid cycle, oxidative phosphorylation 2) Fermentation and anaerobic respiration (pathways that do not involve oxygen)--we will cover at the end if we have time. There are 2 types of metabolic pathways in cells: catabolic---breaking down stuff anabolic---building up stuff The catabolic pathways of cellular respiration take place mainly in a mitochondrion . Note: Both plant and animal cells have mitochondria. However, since plant cells can capture energy from the sun by chloroplasts, they have fewer mitochondria. Fig. 9-2 Light energy ECOSYSTEM Photosynthesis in chloroplasts CO 2 + H 2 O Cellular respiration in mitochondria Organic molecules + O 2 ATP powers most cellular work Heat energy ATP Sun...
View Full Document