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Enzymes can be used to cut strands of DNA into fragments - Scottish Highers Human Biology - Question 6 - 2019
Question 6
Enzymes can be used to cut strands of DNA into fragments. The diagram shows the cutting sites of two different enzymes on a DNA strand that is 40 kilobases (kb) long... show full transcript
Worked Solution & Example Answer:Enzymes can be used to cut strands of DNA into fragments - Scottish Highers Human Biology - Question 6 - 2019
Step 1
What length of fragments (kb) would be produced if the DNA strand was cut with enzyme X only?
Answer
To determine the lengths of the fragments produced by enzyme X, we first need to locate the cutting site of enzyme X on the 40 kb DNA strand. The diagram indicates that enzyme X cuts the strand into two segments.
- Identify Cutting Points: From the diagram, enzyme X cuts the DNA at the 12 kb mark.
- Calculate Fragment Lengths: The DNA strand is 40 kb long, and since enzyme X cuts at 12 kb:
- The first fragment will be from 0 kb to 12 kb, which is 12 kb long.
- The second fragment will be from 12 kb to 40 kb, which is calculated as:
Thus, the lengths of the fragments produced by enzyme X are 12 kb and 28 kb.
Final Answer: B 12, 28