IB biology IA respiration - 1681 Words

Background Research Yeast are eukaryotic microorganisms just like other organisms, they must respire in order to survive. Respiration can be defined as the controlled release of energy from organic compounds to form adenosine triphosphate (ATP). The type of respiration that occurs is called aerobic respiration. It occurs when glucose and oxygen are present. It can be summarized by the equation: . Enzymes play a very significant part in respiration. During the different stages of respiration, enzymes that are often found in the matrix of the mitochondria are used to speed up reactions in the body by reducing a reaction’s activation energy, which means that less energy is required to start a reaction. Enzymes need to collide with their†¦show more content†¦Vice versa, if a smaller concentration of yeast was used than what was stated, the time taken for the end point to be reached will be shorter because there are less respiring yeast cells present, increasing the time taken for the TTC to become reduced. Concentration of glucose solution Glucose solution should be drawn from a single stock solution to prevent fluctuations in concentrations. % If a bigger volume of glucose was measured than what was stated, the time taken for the end point to be reached will be faster than it would be normally, because there are more glucose molecules present, reducing the time taken for the TTC to become reduced. Vice versa, if a smaller volume of glucose was measured than what was stated, the time taken for the end point to be reached will be shorter because there are less glucose molecules present, increasing the time taken for the TTC to become reduced. Uncontrolled Variable Uncontrolled variables Measures to control the uncontrolled variables Effect on results Light sensitivity for TTC Keep the TTC under shade The solution will not or have a delay when turning pink, thus making the results inaccurate and unreliable Yeast concentrationShow MoreRelatedRevision Checklist for Igcse Biology6564 Words   |  27 PagesRevision Checklist for IGCSE Biology 0610 Guide for Students REVISION CHECKLIST for IGCSE Biology 0610 A guide for students How to use this guide The guide describes what you need to know about your IGSCE Biology examination. It can be used to help you to plan your revision programme for the theory examinations and will explain what the examiners are looking for in the answers you write. It can also be used to help you revise by using the tick boxes in Section 3, ‘What you need to know?’, toRead MoreBIOLOGY GRADE 11 NOTES Essay examples6702 Words   |  27 Pagesï » ¿Biology Grade 11 Exam Study Guide Diversity Taxonomic Categories Domain Kingdom Phylum Class Order Family Genus Species Hierarchy From most general to most specific Binomial Nomenclature System used to identify all organisms on Earth Identifies an organism by its genus and species (ex. Humans-homo sapiens) Developed by Linnaeus in the 18th century Identifying Species 3 methods: Morphology ïÆ'   Form and shape ïÆ'   It is simple but there are natural variations in population