AQA A LEVEL BIOLOGY

90. What is leftover after the pathogens have been eradicated? 91. What forms the cellular response? 92. What forms the humoral response? 92. What is the primary immune response? 93. Why is the primary response so slow? 94. What do the different memory cells remember? 95. What is the secondary immune response? 96. Why is the secondary immune response quicker? 97. What is in vaccines? 98. What is Herd Immunity? 99. What kinds of anti...

Structure of DNA Structure of RNA Nucleotide Bases in DNA What is T replaced with in RNA? Complementary base pairs Pyrimidines Purines Non-overlapping Anti-parallel Degenerate code Watson-Crick model Semi-conservative replication Process of semi-conservative replication Isotopes Meselson and Stahl experiment (1958) ATP Structure of ATP

The adult damselfly uses a tracheal system for gas exchange. Explain three ways in which an insect's tracheal system is adapted for efficient gas exchange. (3) Co-Transport (Not mark scheme specific, only here as a guidance) Compare and contrast mitosis and meiosis [Differences Mitosis(4), Meiosis(6)][Similarities (2)] Describe the chemical reactions involved in the conversion of polymers to monomers and monomers to polymers. Give two named examples of polymers and their associated mon...