Biology A H020: Cell division, cell diversity and cellular organisation Topical Past Paper Questions

DNA has a double helix structure made from polynucleotides. (a) Describe how a polynucleotide is formed from its monomers. [1] (b) DNA is replicated during interphase of the eukaryotic cell cycle. (i) The enzyme helicase is active during DNA replication. Describe the action of he…

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 row, $ \mathbf{A} $ to $ \mathbf{D} $, shows the stages of meiosis where crossing over and independent assortment occur?