5 Written Questions
5 Matching Questions
- double helix
- x-ray crystallography
- origin of replication
- nucleotide excision repair
- a A technique that depends on the diffraction of an X-ray beam by the individual atoms of a crystallized molecule to study the three-dimensional structure of the molecule.
- b A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.
- c The form of native DNA, referring to its two adjacent antiparallel polynucleotide strands wound around an imaginary axis into a spiral shape.
- d Site where the replication of a DNA molecule begins, consisting of a specific sequence of nucleotides.
- e An enzyme that catalyzes the lengthening of telomeres in eukaryotic germ cells.
5 Multiple Choice Questions
- The cellular process that uses specific enzymes to remove and replace incorrectly paired nucleotides.
- A dense region of DNA in a prokaryotic cell.
- A protein that breaks, swivels, and rejoins DNA strands. During DNA replication, topoisomerase helps to relieve strain in the double helix ahead of the replication fork.
- A virus that infects bacteria; also called a phage.
- Eukaryotic chromatin that remains highly compacted during interphase and is generally not transcribed.
5 True/False Questions
DNA polymerase → An enzyme that catalyzes the elongation of new DNA (for example, at a replication fork) by the addition of nucleotides to the 3' end of an existing chain. There are several different DNA polymerases; DNA polymerase III and DNA polymerase I play major roles in DNA replication in prokaryotes.
euchromatin → The complex of DNA and proteins that makes up a eukaryotic chromosome. When the cell is not dividing, chromatin exists in its dispersed form, as a mass of very long, thin fibers that are not visible with a light microscope.
bacterium → One of two prokaryotic domains, the other being Archaea.
telomere → The tandemly repetitive DNA at the end of a eukaryotic chromosome's DNA molecule that protects the organism's genes from being eroded during successive rounds of replication. See also repetitive DNA.
Lagging strand → The new complementary DNA strand synthesized continuously along the template strand toward the replication fork in the mandatory 5'?3' direction.