Which of the following statements correctly describes a nucleosome?
A strand of DNA coiled around a central core of eight histone proteins.
A strand of DNA wrapped around a central core of four histone proteins.
A section of supercoiled DNA.
A strand of DNA wrapped around a central core of eight chromatin proteins.
Which of the following is not a conclusion relating to the structure of DNA drawn by Rosalind Franklin from her X-ray diffraction results?
DNA is a double helix.
DNA contains a repeating structure.
Bases pair up according to the rules of complementary base pairing.
The turns of the DNA spiral are approximately 3.5 nm apart.
Which of the following correctly identifies the role of DNA polymerase in DNA replication?
Forms hydrogen bonds between the bases of the new nucleotides and the template strand.
Unwinds the DNA double helix at the replication fork.
Covalently bonds new DNA nucleotides together.
Joins up the Okazaki fragments on the lagging strand.
To which part of the DNA molecule will new nucleotides be covalently bonded during DNA replication?
Which of the statements about non-coding DNA is correct?
Non coding sequences code for polypeptides and functional RNA such as tRNA.
Non coding sequences do not code for polypeptides but can code for functional RNA such as tRNA.
Non-coding DNA is only found in between genes.
Telomeres are a type of non-coding DNA that regulate gene expression.
