DNA 0.0 / 5 ? BiologyDNAGCSEOCR Created by: munchlee2002Created on: 07-09-17 16:35 What does DNA contain? All of an organism’s genetic material - the chemical instructions it needs to grow and develop 1 of 22 What is DNA arranged into? Chromosomes 2 of 22 What are chromosomes? Long molecules of coiled up DNA 3 of 22 What is DNA divided up into? Short sections called genes 4 of 22 What is DNA? A double helix (a double-stranded spiral). 5 of 22 What are the two DNA strands made up of? Lots of nucleotides joined together in a long chain - this makes DNA a polymer 6 of 22 What does each nucleotide contain? A small molecule called a “base”. 7 of 22 How many bases does DNA contain? Four 8 of 22 What are complementary base pairs? A = T and C = G 9 of 22 What are the four bases? A = adenine, T = thymine, C = cytosine, G = guanine 10 of 22 What do the bases form on the other strand? Cross links 11 of 22 What do cross links do? It keeps the two strands tightly wounded together 12 of 22 Which base does A pair with in DNA? T 13 of 22 Which base does C pair with in DNA? G 14 of 22 What are the same in each DNA nucleotide? The same sugar and a phosphate group 15 of 22 What is the only part of the molecule that varies on each nucleotide? The base 16 of 22 What is the base attached to? The sugar 17 of 22 What are polymers? Large, complex molecules composed of long chains of monomers joined together 18 of 22 What are monomers? Small, basic molecular units 19 of 22 Which polymer is made up of nucleotide monomers? DNA 20 of 22 Why can DNA be described as a polymer? It’s a large, complex molecule made up of nucleotides (monomers) joined together in a long chain 21 of 22 Explain the effect of base-pairing on the structure of DNA. Each base forms cross links to a base on the opposite strand. This keeps the two DNA strands wound tightly together 22 of 22
Comments
No comments have yet been made