5 Written questions
5 Matching questions
- nucleotide excision repair
- a (1) The conversion of a normal animal cell to a cancerous cell. (2) A change in genotype and phenotype due to the assimilation of external DNA by a cell.
- b 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.
- c The basic, bead-like unit of DNA packing in eukaryotes, consisting of a segment of DNA wound around a protein core composed of two copies of each of four types of histone.
- d A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.
- e A virus that infects bacteria; also called a phage.
5 Multiple choice questions
- A discontinuously synthesized DNA strand that elongates by means of Okazaki fragments, each synthesized in a 5'3' direction away from the replication fork.
- A short segment of DNA synthesized away from the replication fork on a template strand during DNA replication, many of which are joined together to make up the lagging strand of newly synthesized DNA.
- A short stretch of RNA with a free 3' end, bound by complementary base pairing to the template strand, that is elongated with DNA nucleotides during DNA replication.
- Eukaryotic chromatin that remains highly compacted during interphase and is generally not transcribed.
- The DNA strand that provides the pattern, or template, for ordering the sequence of nucleotides in an RNA transcript.
5 True/False questions
bacteria → Member of the prokaryotic domain Bacteria.
semiconservative model → Type of DNA replication in which the replicated double helix consists of one old strand, derived from the old molecule, and one newly made strand.
nucleoid → An enzyme that cuts DNA or RNA, either removing one or a few bases or hydrolyzing the DNA or RNA completely into its component nucleotides.
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.
radioactive isotope → An isotope (an atomic form of a chemical element) that is unstable; the nucleus decays spontaneously, giving off detectable particles and energy.