Biology A H020: Cell structure Topical Past Paper Questions

(a) (i) Some students collect a sample of pond water to observe under a light microscope. They pour some of the pond water onto a microscope slide. Describe how they could improve their technique in preparing the microscope slide for examination under a light microscope. [2] (ii)…

The diagrams below are of two specialised cells. Fig. 7.1 shows a sperm cell from a mammal. Fig. 7.2 shows a palisade cell from a plant. Fig. 7.1 Fig. 7.2 (a) With reference to the features shown in Fig. 7.1, explain how the sperm cell is adapted to its function. (b) With referen…

Which of the stains, A to D, would be chosen to bind to the phosphate group of DNA to make chromosomes more visible when using a light microscope? A carbolfuchsin – a non-polar dye B nigrosin – a negatively charged dye C methylene blue – a positively charged dye D Sudan 111 – a l…