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A DNA template contains the following bases: 5’-ATT GCG TAA-3’ Which of the following sequences represent the complementary strand that would be synthesised by DNA polymerase? Question 4Answer a. 5’-AAT GCG TTA-3’ b. 5’-TTA CGC AAT-3’ c. 5’-ATT GCG TAA-3’ d. 5’-TAA CGC ATT-3’

Question

A DNA template contains the following bases:

5’-ATT GCG TAA-3’

Which of the following sequences represent the complementary strand that would be synthesised by DNA polymerase?

Question 4Answer

a. 5’-AAT GCG TTA-3’

b. 5’-TTA CGC AAT-3’

c. 5’-ATT GCG TAA-3’

d. 5’-TAA CGC ATT-3’

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Solution

The complementary strand of DNA is created by pairing the bases A with T and C with G. The sequence is also synthesized in the opposite direction, from 3' to 5'.

So, for the given DNA template 5’-ATT GCG TAA-3’, the complementary strand would be:

3'-TAA CGC ATT-5'

However, since DNA strands are usually written from the 5' to 3' direction, we reverse this to get:

5'-TTA CGC AAT-3'

So, the correct answer is (b) 5’-TTA CGC AAT-3’.

This problem has been solved

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