B) T… Show more Which statement about the polarity of DNA strands is true? A) The 3′ end has a free OH group B) The 5′ end has a free OH group C) The 3′ end has a free phosphate group To help achieve proper base pairing and hence form a double helix, which condition must be met? A) A purine base must pair with a pyrimidine base. B) A purine base must pair with a purine base. C) A pyrimidine base must pair with pyrimidine base. If you were to try and pair a thymine with a cytosine (a non Watson-Crick base pairing), then would you expect to see any stability with respect to the hydrogen bonding (assuming the geometrical configurations of both bases were favorable to each other)? If yes, then how many hydrogen bonds could form between these two bases? A) Yes, two hydrogen bonds could form between thymine and cytosine. B) Yes, one hydrogen bond could form between thymine and cytosine. C) No, hydrogen bonds cannot form between thymine and cytosine. D) Yes, three hydrogen bonds could form between thymine and cytosine • Show less