A portion of one strand of a macromolecule from Group B has the sequence -CGATTCGGTTA- The complementary strand would be A - VCE - SSCE Biology - Question 4 - 2016 - Paper 1

To determine the complementary strand of the DNA sequence -CGATTCGGTTA-, we need to follow the base pairing rules:

• Cytosine (C) pairs with Guanine (G)
• Guanine (G) pairs with Cytosine (C)
• Adenine (A) pairs with Thymine (T)
• Thymine (T) pairs with Adenine (A)

Starting with the provided sequence:

• Original strand:
  -C G A T T C G G T T A-

We can find the complementary bases:

• Complementary strand:
  -G C T A A G C C A A T-

This sequence corresponds with option C: -GCTAAGCCATT-.