4 (a) The diagram shows part of a DNA molecule - Edexcel - GCSE Biology - Question 4 - 2012 - Paper 1
Question 4
4 (a) The diagram shows part of a DNA molecule.
(i) Complete the diagram by writing the letters of the missing bases in the empty boxes.
A T __ A G C
(ii) Name ... show full transcript
Worked Solution & Example Answer:4 (a) The diagram shows part of a DNA molecule - Edexcel - GCSE Biology - Question 4 - 2012 - Paper 1
Step 1
(i) Complete the diagram by writing the letters of the missing bases in the empty boxes.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The missing bases to complete the DNA sequence in the diagram are:
For the first missing box, the complementary base for A is T.
For the second missing box, the complementary base for C is G.
Thus, the sequence is A T T A G C, completing the diagram as follows:
A T T A G C
Step 2
(ii) Name the type of bond that joins the base pairs together.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The type of bond that joins the base pairs together is a hydrogen bond. These bonds are weak and facilitate the pairing between the nitrogenous bases of DNA.
