B2 - DOUBLE HELIX 0.0 / 5 ? BiologyDNA and inheritanceGCSEEdexcel Created by: ellenjxnesCreated on: 17-05-16 20:07 What is a DOUBLE HELIX? Two DNA strands coiled together 1 of 10 What are the DNA strands MADE up of? Four chemical bases 2 of 10 What are the BASE SUBSTANCES? Adenine (A), Cytosine (C), Guanine (G), Thymine (T) 3 of 10 How do these BASES PAIR UP? A-T, C-G 4 of 10 How are the BASES JOINED together? Weak hydrogen bonds 5 of 10 What is a GENE? A section of DNA 6 of 10 What do the BASE sequences CODE for? A specific protein 7 of 10 Who discovered the STRUCTURE of DNA? Rosalind Franklin and Maurice Wilkins, James Watson and Francis Crick 8 of 10 How did FRANKLIN and WILKINS DISCOVER this? Directed beams of X-rays onto crystallised DNA and looked at patterns the X-ray formed when they bounced off 9 of 10 What did WATSON and CRICK do? Used Franklin and Wilkins ideas, used their knowledge that A & G matched the ammount of T & C, made a model of DNA where all pieces fitted together 10 of 10
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