Comparing the DNA Structure to A Ladder
Comparing the DNA Structure to A Ladder
1) Sort the following in order of size; DNA, cell, nucleus, chromosome (1 mark) 2) What is the special term to describe the structure of DNA? (1 mark) 3) Describe the structure of DNA using the analogy of a ladder a) what forms the sides of the ladder? b) what form the rungs of the ladder? (2 marks) 4) Name the four bases that make up DNA (4 marks) 5) What are the complimentary base pairs? (2 marks) 6) Construct a 3-D Model using any materials you like (10 marks). 1. Write the missing bases down the right strand. (9 marks) Section 2 A A G GΣ GΣ CK T G с T UWHULUTUI А A C< A С A T T 2. Because of base pairing, cells can make accurate copies of DNA. When the DNA strands open, free bases can only join onto the strands in the correct places. Complete the two strands to show this. Draw the missing bases. (18 marks)
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