Biology (A) 9BN0/01 May June 2021

Edexcel A Level Biology A (9BN0) Jun 2021

معلم موافق رایگان بودن است.

1. Climate Change and Carbon Cycling: Role of power stations in carbon dioxide emissions, effectiveness of wood chips as a renewable energy source, and long-term carbon neutrality in biomass combustion.

2. Human Evolution and DNA Analysis: Use of PCR and electrophoresis to compare Neanderthal and modern human DNA, genetic evidence for interbreeding, and implications for human ancestry.

3. Genetics and Natural Selection in Elephants: Effects of ivory poaching on tusk frequency, application of the Hardy-Weinberg equation to population genetics, and prediction of evolutionary trends in Mozambique elephants.

4. Cell Division and Specialization: Fertilization, totipotency in early embryos, mechanisms of cell specialization into tissues, and impact of epigenetic modifications on gene expression.

5. Biodiversity and Conservation: Roles of zoos in protecting endangered species, impact of road construction on woodland habitats, and assessment of biodiversity to minimize environmental disruption.

6. Antibiotic Resistance and Bacterial Evolution: Mechanisms of bacteriostatic antibiotics, role of ribosome-targeting antibiotics in protein synthesis inhibition, and potential for overcoming bacterial resistance through new drug classes.