Evaluating the Use of Stem Cells Use of embryonic stem cells Due to their ability to differentiate into multiple cell types, stem cells have huge potential in the therapeutic treatment of di...
Pluripotent & Unipotent Cells Pluripotent embryonic stem cells Pluripotent stem cells are embryonic stem cells that can differentiate into?any cell type found in an embryo?but are?not ab...
The Effect of Genetic Mutations Mutations occur?spontaneously?and?randomly?during DNA replication As the DNA base sequence determines the sequence of amino acids that make up a protein,?muta...
Required Practical: Investigating Factors Affecting Species Distribution Understanding how to investigate the effects of?named environmental factors?on the?distribution?of a?given species?is an imp...
Conservation & Human Need Humans use many?resources?from the Earth such as?land?(for settlements and agriculture),?water,?wood?and?fossil fuels As the human?population?increases?and coun...
Apparatus & Techniques: Investigating Growth Rate Using Turbitity Measurements The?population growth rate?of microorganisms, such as bacteria or yeast, can be investigated by growing the...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 2.7.5 Human Gas Exchange System Structure of the Breathing System The lungs are the gas exchange surface in humans All gas exchange surfaces have features in common w...
Primary Succession Ecosystems are?dynamic, meaning that they are constantly?changing Sometimes, ecosystems change from being very?simple?to being relatively?complex This process is known as?...
Ecosystems are Dynamic Ecosystems Species?do not exist by themselves in their own isolated environment, they interact with other species forming a?community The species within a community in...
