Metabolism Study Guide

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1. Most organisms are active in a limited temperature range Identify the role of enzymes in metabolism, describe their chemical composition and use a specific model to describe their specificity on substrates Molecules: Consist of atoms Enzymes: Break the molecule bonds, but need energy to do so – ACTIVATION ENERGY (required to start chemical reaction) 1. The role of enzymes in metabolism 1. Metabolism refers to all the chemical reactions occurring in organisms 2. Enzymes are biological catalysts for all processes going on inside cells. 3. They are able to be used over and over again 4. They increase the rate of chemical reactions at lower temps and decrease the activation energy needed for metabolic…show more content…
The nervous system is made up of two parts: 3. CNS – Central Nervous System: 1. Consists of the brain and spinal chord 2. Acts as a control centre for all the bodily functions 4. PNS – Peripheral Nervous System: 3. A branching system of nerves that transmits messages from the central nervous system and back 4. Receptors-specialised cells which detect stimulus 5. Sensory nerves-carry messages from receptor to CNS 6. Motor nerves-Carry messages from CNS to the effector 7. Effectors-muscles or glands 5. The nervous system works with another system called the endocrine system 6. Endocrine system: This system produces hormones in response to certain stimuli Identify the broad range of temperatures over which life is found compared with the narrow limits for individual species Ambient temperature is the temperature of the environment 1. Aquatic organisms 1. Are found in water with temperatures between: 1. -2oC to 40oC 2. Terrestrial organisms 2. Air temperatures between: 2. -60oC and 60oC 3. Bacteria 3. Found at the extremes of earth temperatures…show more content…
As sucrose enters the phloem the concentration of phloem sap increases. This causes the entry of water by osmosis from the surrounding cells 5. Water pressure is lower in the sink and therefore, this results in the water and dissolved solutes to flow towards a SINK 6. A sink is a region of the plant where sugars and other nutrients are actively being removed from the phloem. As sucrose moves out of the phloem sap and into surrounding cells (with energy), water flows out of them. This reduces the pressure in the sieve cells at the sink region (less sugar) and the water moves back to the phloem Perform a firsthand investigation to demonstrate the effect of dissolved carbon dioxide on the pH of water 1. Blowing through a straw into the water 1. High technology read the levels of water pH as the carbon dioxide from our breath was dissolved into the water Perform a firsthand investigation using the light microscope and prepared slides to gather information to estimate the size of the red and white blood cells and draw scaled diagrams of each 2. Red blood cell = 7-9 um (micro metres) 3. White blood cells = 10-12 um 4. 1 millimetre = 1000

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