B5 Biology OCR 21st Century revision B5 GCSE revsion OCR 21st Century biology 4.5 / 5 based on 4 ratings ? BiologyGCSEOCR Created by: SaraCreated on: 05-01-13 22:06 Shape of DNA double helix 1 of 20 Adenine and Thymine join up, as do... Cytosine and Guanine 2 of 20 Section of DNA gene 3 of 20 This many bases codes for an amino acid three 4 of 20 Organelles which proteins are made by ribosomes 5 of 20 A copy of DNA is made by messenger RNA 6 of 20 Process of cell division mitosis 7 of 20 Process of cell division which produces gametes with half the normal number if chromosomes meiosis 8 of 20 Type of cells found in an early embryo unspecialized cells 9 of 20 Process of become specialized differentiation 10 of 20 Way of making stem cells cloning 11 of 20 Only tissue in which cells are found in a plant that's mitotically active meristems 12 of 20 When cells become specialized in plant cells and form tissues like...? xylem and phloem 13 of 20 Part of a plant thats been cut off Cutting 14 of 20 Type of powder given to plants so they grow rooting powder 15 of 20 Growth towards or away from light phototropism 16 of 20 Chemicals that control growth near the tips of roots and shoots auxins 17 of 20 How many different bases does DNA have? four 18 of 20 Where proteins are made in a cell cytoplasm 19 of 20 What stage are cells in an embryo differentiated to? eighth 20 of 20
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