alleryWhy is the distance between the two strands of DNA nearly uniform?
ATwo purines always pair
BA purine faces a pyrimidine
CHistones hold strands apart
DPyrimidines pair together
Answer & Solution
Correct answer: B. A purine faces a pyrimidine
Each pair always has one larger purine and one smaller pyrimidine, so every rung of the helix is about the same width.
Keep practising Molecular Basis of Inheritance
Browse all Molecular Basis of Inheritance questions for Bihar Board Class 12 (Science), or explore more Biology topics.
Related questions
Which is the largest known human gene, at 2.4 million bases?Regulation of the lac operon by its repressor is called?Which lac operon product increases permeability to beta-galactosides?Which bacterial rRNA acts as a ribozyme in peptide bond formation?Insertion or deletion of one or two bases causes which kind of mutation?Whose cell-free protein synthesis system helped decipher the genetic code?Whose chemical method made RNA with defined base combinations?From bacteria to humans, which amino acid does UUU code for?