CELLULAR RESPIRATION Chemical Energy Harvest Modified from Johnson

Items to be covered in Cellular Respiration Lab Metabolism Metabolism Anaerobic respiration Anaerobic respiration Aerobic respiration Aerobic respiration

METABOLISM – The Fire of Life Metabolism-the sum total of all biochemical activity in a living organism Metabolism-the sum total of all biochemical activity in a living organism Anabolic metabolism- “building up” (e.g.; photosynthesis, protein synthesis) Anabolic metabolism- “building up” (e.g.; photosynthesis, protein synthesis) Catabolic metabolism- “breaking down” (e.g.; cellular respiration) Catabolic metabolism- “breaking down” (e.g.; cellular respiration)

METABOLISM – Chemical Energy Harvest Cellular respiration - the energy yielding process in all living things that converts chemical energy from food into a usable ATP energy that can be used for cell activities. Cellular respiration - the energy yielding process in all living things that converts chemical energy from food into a usable ATP energy that can be used for cell activities. Anaerobic Respiration and Aerobic Respiration are two different metabolic pathways of cellular respiration. Anaerobic Respiration and Aerobic Respiration are two different metabolic pathways of cellular respiration.

METABOLISM Metabolic Pathways

ANAEROBIC RESPIRATION Anaerobic means “without air” and takes place in the absence of oxygen (O2). Anaerobic means “without air” and takes place in the absence of oxygen (O2). Occurs in yeast, bacteria, and (when necessary) animal muscle cells. Occurs in yeast, bacteria, and (when necessary) animal muscle cells. Takes place in the cytoplasm of the cell (mitochondria not required). Takes place in the cytoplasm of the cell (mitochondria not required). Yields 2 ATP’s per molecule of glucose sugar (much less efficient than aerobic respiration). Yields 2 ATP’s per molecule of glucose sugar (much less efficient than aerobic respiration).

ANAEROBIC RESPIRATION – Yeast cell Yeast are microscopic, unicellular fungi that are important for producing bread and alcoholic beverages. Yeast are microscopic, unicellular fungi that are important for producing bread and alcoholic beverages. Anaerobic respiration in yeast is known as fermentation. Anaerobic respiration in yeast is known as fermentation. Glucose = ethyl alcohol + carbon dioxide + energy (2 ATP’s) Glucose = ethyl alcohol + carbon dioxide + energy (2 ATP’s) The bubbles of carbon dioxide cause dough to rise and produce leaven bread. The bubbles of carbon dioxide cause dough to rise and produce leaven bread.

AEROBIC RESPIRATION Aerobic respiration requires oxygen (O2). Occurs in most plants and animals. Aerobic respiration requires oxygen (O2). Occurs in most plants and animals. Takes place in the mitochondria. Takes place in the mitochondria. Most efficient means of respiration; yields 36 ATP’s of energy per molecule of glucose. Most efficient means of respiration; yields 36 ATP’s of energy per molecule of glucose. Overall reaction glucose + oxygen = carbon dioxide + water + energy (36 ATP’s) Overall reaction glucose + oxygen = carbon dioxide + water + energy (36 ATP’s)

AEROBIC RESPIRATION Mitochondria The “powerhouse” of the cell. Site for Kreb’s cycle and aerobic respiration The “powerhouse” of the cell. Site for Kreb’s cycle and aerobic respiration Numerous cristae serve as a workbench for production of ATP’s Numerous cristae serve as a workbench for production of ATP’s