SNAB AS topics for 2008

Context-led Edexcel Biology from 2008

Here are topics and topic summaries for the Salters-Nuffield Advanced Biology context-led version of the Edexcel GCE Biology specification for 2008. (For the current 2005 SNAB course topic summaries see the specification whch you can download from the Edexcel website.)

Topic 1 Lifestyle, health and risk
This topic builds on the knowledge and understanding which students bring to the course on the functioning of the circulatory system and the importance of diet in maintaining the body. The role of diet and other lifestyle factors in maintaining good health is considered with particular reference to the heart and circulation and to cardiovascular disease (CVD). The structures and functions of some carbohydrates and lipids are also detailed within this context. Ideas about correlation, causation, and the concept of risks to health are covered.

Topic 2 Genes and health
This topic considers the following biological principles: the properties of and transport of materials, across cell membranes and gas exchange surfaces, DNA structure and replication, protein synthesis, enzymes and monohybrid inheritance through the context of the genetic disease cystic fibrosis. The potential that gene therapy offers as treatment for cystic fibrosis is examined. The topic also allows for discussion of the social and ethical issues surrounding the diagnosis and treatment of genetic conditions.

Topic 3 The voice of the genome
This topic follows the story of the development of multicellular organisms from single cells to complex individuals. Cell structure and ultrastructure, cell division, the importance of fertilisation, the roles of stem cells, gene expression, cell differentiation and tissue organisation are all considered within this topic, as is the role of the genotype and the effect of the environment on phenotype.

Topic 4 Biodiversity and natural resources
The topic focuses on biodiversity and the wealth of natural resources used by humans. The meaning of biodiversity and how it can be measured is considered first, and how all this diversity has come about through adaptation and natural selection. It has sections on both traditional and novel uses of plants and plant fibres, and the use of chemical extracts from animals and plants. The concern for disappearing biodiversity and loss of potential natural resources is used to highlight the need for biologists to idenify, name and classify species. The topic ifinishes by looking at the role of zoos in the conservation of endangered species. General biologicial principles covered include the relationship of plant anatomy to function, and the structure and role of cellulose and starch.

What next?
The course will lead on to the Salters-Nuffield Advanced Biology context-led version of Edexcel GCE Biology A2.