AS Biology AQA Unit 2 4.0 / 5 based on 1 rating ? BiologyDNA, genetics and evolutionASAQA Created by: Ciara RyanCreated on: 04-04-15 23:11 What's the stage in which chromosomes thicken and become visible? Prophase 1 of 13 Purpose of centromere For spindle fibres to attach to and separate sister chromatids 2 of 13 What does chemotherapy do to the cell cycle of cancerous cells? Stop replication of DNA and inhibit spindle formation to stop metaphase. 3 of 13 What is telophase? When the spindle fibres break down and the nuclear envelope and nucleolus reform 4 of 13 3 uses of mitosis Growth, Differentiation and Repair 5 of 13 Enzyme responsible for breaking hydrogen bonds separating the 2 strands DNA helicase 6 of 13 Enzyme responsible for reforming hydrogen bonds and joining nucleotides to a polynucletide strand DNA polymerase 7 of 13 Which blood vessel goes to the liver? Hepatic Artery 8 of 13 Which blood vessel goes from the small intestine and stomach to the liver? Hepatic portal vein 9 of 13 Which blood vessel goes from the kidneys to the heart? Renal vein 10 of 13 Meiosis forms 2 daughter cells? False 11 of 13 Why is a animal with 37 chromosomes sterile? It has an uneven number of chromosomes so it cannot be halved or go through meiosis 12 of 13 Name of non-coding sections of DNA Introns 13 of 13
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