Aqa A Level Biology Paper 1 Exam Questions (208 Terms) With Verified Definitions Updated 2024

Nuclei, Chloroplasts, Mitochondria, Lysosomes, Endoplasmic Reticulum, Ribosomes {Ans: Order of Organelles}1. Hydrogen bonds between DNA base pairs are broken 2. One DNA strand acts as a template 3. Free RNA nucleotides align by complementary base pairing (uracil is used instead of thymine) 4. RNA polymerase forms phosphodiester bonds between adjacent RNA nucleotides joining them together. 5. Pre-mRNA is spliced, removing introns then joining the exons. 6. mRNA moves out of nucleus via nuclear pore {Ans: Polypeptide synthesis (In nucleus) (6) [Transcription]}1. In metaphase II, homologous chromosomes are randomly aligned along the equator. 2. They are randomly pulled to different poles of the cell {Ans: Variation in Meiosis [Independent assortment of homologous chromosomes] (2)}Equation: (desired concentration/concentration of stock) x desired volume {Ans: Serial Dilution [Equation]}A protein molecule that can bind specifically to an antigen {Ans: Antibody}1. Nuclear envelope and pores 2. Chromatin 3. Nucleolus 4. Holds genetic material to code for polypeptides 5. DNA replication occurs here 6. Production of mRNA/tRNA 7. Production of ribosomes {Ans: Describe the structure and the function of the nucleus. (4) [Structure (3)] [Function(4)]}1. Joins adjacent DNA nucleotides 2. Catalyses condensation reactions and formation of phosphodiester bonds between adjacent DNA