Outline the role of telomeres in preventing the loss of genes from the ends of chromosomes during DNA replication
1 Answer Explain the importance of mitosis in the production of genetically identical daughter cells during: growth of multicellular organisms replacement of damaged or dead cells, repair of tissues by cell replacement, asexual reproduction
1 Answer Explain the movement of water between cells and solutions in terms of water potential and explain the different effects of the movement of water on plant cells and animal cells (knowledge of solute potential and pressure potential is not expected)
1 Answer Investigate the effects of immersing plant tissues in solutions of different water potentials, using the results to estimate the water potential of the tissues
1 Answer Investigate the effect of changing surface area to volume ratio on diffusion using agar blocks of different sizes
1 Answer Illustrate the principle that surface area to volume ratios decrease with increasing size by calculating surface areas and volumes of simple 3-D shapes (as shown in the Mathematical requirements)
1 Answer Investigate simple diffusion and osmosis using plant tissue and non-living materials, including dialysis (Visking) tubing and agar
1 Answer Describe the roles of phospholipids, cholesterol, glycolipids, proteins and glycoproteins in cell surface membranes, with reference to stability, fluidity, permeability, transport (carrier proteins and channel proteins), cell signalling (cell surface receptors) and cell recognition (cell surface antigens)
1 Answer Investigate the progress of enzyme-catalysed reactions by measuring rates of formation of products using catalase and rates of disappearance of substrate using amylase
1 Answer Investigate the difference in activity between an enzyme immobilised in alginate and the same enzyme free in solution, and state the advantages of using immobilised enzymes
1 Answer 
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
To continue with the best experience: