1) What is holding the nitrogen bases at X? a) sugar b) phosphate c) hydrogen bond d) helix 2) What is the structure called that is circled in red? a) nucleoside b) backbone c) nitrogen base d) nucleotide 3) What is this twisted ladder shape called? a) double helix b) nucleic acid c) base pairs d) spiral ladder 4) Adenine always bonds with _ in DNA. a) Cytosine b) Guanine c) Thymine 5) Cytosine always bonds with _ in DNA. a) Adenine b) Guanine c) Thymine 6) Thymine always bonds with _ in DNA. a) Adenine b) Cytosine c) Guanine 7) Guanine always bonds with _ in DNA. a) Adenine b) Cytosine c) Thymine 8) What are found in the red circles? a) base pairs b) sugar and phosphate c) backbone d) hydrogen 9) In this model of DNA the section circled in red is called the backbone. What is the backbone made of? a) adenine & thymine b) sugar & nucleic acid c) cytosine & guanine d) sugar & phosphate 10) What in DNA determines the code for traits? a) hydrogen bonds b) sugar & phosphate sequence c) sequence of the nitrogenous bases d) proteins 11) On which row are the nitrogenous bases incorrectly paired? a) 1 b) 2 c) 3 d) 4 e) 5

DNA Structure

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