Biology OCR Test 2 (A2) 2.5 / 5 based on 2 ratings ? BiologyA2/A-levelOCR Created by: MJCreated on: 29-05-13 18:43 What does haploid mean? Half of original chromosomes 1 of 19 Asexual reproduction in eurkaryotes is... Mitosis 2 of 19 Asexual in prokaryotes is Binary Fission 3 of 19 How can variation be caused in Mitosis? Mutation 4 of 19 Gametes fuse together to form a ________. Zygote 5 of 19 A bivalent is... Chromosomes lined up in their homologous pairs 6 of 19 Where do chiasmata form? Prophase 1 7 of 19 When does the nuclear envelope disintergrates and nucleous disappear? Prophase 1 + 2 8 of 19 What is spindle fibre made from? Protein microtubules 9 of 19 When do bivalents line up at the equator of the spindle? Metaphase 1+2 10 of 19 What aspect of DNA molecules makes them less likely to mutate? Structure 11 of 19 A mutation in mitosis can be described as Somatic 12 of 19 Why do some proteins have to be activated? Their shape needs to be a better fit to their complementary molecules 13 of 19 mRNA is a copy of a Coding stand 14 of 19 RNA polymerase catalyses The hydrogen bonding between complementary nucleotide bases on the template strand and activated free nucleotides 15 of 19 ____________ catalyses the hydrolysis of lactose to glucose and galiactose Beta galactosidase 16 of 19 _________ genes are sequences of base pairs that can be transcribed onto a length of RNA Structural 17 of 19 RNA binds to the __________ region Promotor 18 of 19 Which is correct? Discontinous variation describes qualitative differences between phenotypes 19 of 19
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