Exam 14: Dna: the Genetic Material

Endonucleases and exonucleases are enzymes that can remove nucleotides from a polynucleotide chain.An endonuclease removes nucleotides ________ while an exonuclease removes nucleotides ________.

If a mutation produced helicase that was unable to hydrolyze ATP,DNA replication would be

Griffith,a British microbiologist,used bacteria and mice to demonstrate the process of transformation.During transformation,

Because the two strands of a DNA molecule are ________ to each other,either one can be used as a template to reconstruct the other.

Viruses that attack bacteria are called

In DNA,a purine must always pair with a pyrimidine and vice versa in order to ensure that

During replication,which enzyme unwinds the DNA double helix?

You decide to repeat the Meselson-Stahl experiment,except this time you plan to grow the E.coli cells on light ¹⁴N medium for many generations and then transfer them to heavy ¹⁵N medium and allow them to grow for 2 additional generations (2 rounds of DNA replication).If the conservative model of DNA replication was correct,what is the expected distribution of DNA in the density gradient after two rounds of replication?