{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Micro Lecture 3

Micro Lecture 3 - Biology 31 Microbiology Lecture 3...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Biology 31 Microbiology Lecture 3 Microbial Metabolism and Growth What is Metabolism? Sum of chemical reactions (occurring in) of an organism Destruction Metabolism Catabolism Typically releases energy Construction Metabolism Anabolism Typically requires energy input Energy Ability to do work Measured in calories Amount of energy required to increase m ml of H2O 1˚ Centigrade Amount of hear required to increase 1 gm. H2O 1˚ C Both the same Calories = kilocalories (1X1000) (food calorie is not 1, but 1,000!) Adenosine Triphosphate (ATP) Form of energy required for cellular activities Acquired from breakdown of organic compounds (especially glucose) Molecule containing energy *Energy releasing pathways discussed later Enzymes Molecules composed of: Protein Cofactor Metal ion Organic molecule (coenzyme) Catalysts Speed up the rate of a reaction, but not themselves changed in the reaction Drive metabolic reactions Enzyme A + B AB Reactions occur more slowly without enzymes Enzymes assist the reaction
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Factors that influence enzyme activity: Temperature 38.5˚ C -39˚C is critical threat to human cells Activity Temperature pH measure of acidity in aqueous solution Substrate (reactants) concentration Inhibitors Interfere with enzyme’s ability to Catalase reaction i.e. – cyanide inhibits enzymes in aerobic activity Trophic levels Autotroph Produce own organic (carbon-based) energy Plants, some protistans, some bacteria Generally not harmful to humans Heterotroph Consume organic energy Animals, fungi, some protistans, some bacteria More likely to cause harm to humans Energy Acquiring Pathways Metabolic Chemical pathways that produce organic energy Methods used by autotrophs to generate energy Photosynthesis Occurs when energy in sunlight is captured in chlorophyll (green pigment)
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}