Welcome to your DNA Structure MCQ Test – Practice, Learn & Master Molecular Biology
What is the basic repeating unit of DNA called?
Which nitrogenous bases are found in DNA?
What is the shape of the DNA molecule as described by Watson and Crick?
Which bond connects nucleotides together in the DNA backbone?
How many hydrogen bonds form between adenine and thymine?
In the Watson-Crick DNA model, what is the pitch of the helix (distance along the helix axis for one complete turn)?
Which of the following DNA structures contains 11 base pairs per complete helical turn and is associated with overwound or positively supercoiled DNA?
What is the major groove width in B-form DNA, and why is this structurally significant?
Under which conditions does DNA undergo a transition from B-form to A-form?
Supercoiled DNA in prokaryotes typically has a superhelical density (σ) of approximately:
