5 Written questions
5 Matching questions
- Mismatch repair
- Okazaki fragment
- a 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.
- b One of two prokaryotic domains, the other being Archaea.
- c A dense region of DNA in a prokaryotic cell.
- d An enzyme that untwists the double helix of DNA at the replication forks, separating the two strands and making them available as template strands.
- e The cellular process that uses specific enzymes to remove and replace incorrectly paired nucleotides.
5 Multiple choice questions
- 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.
- Eukaryotic chromatin that remains highly compacted during interphase and is generally not transcribed.
- An isotope (an atomic form of a chemical element) that is unstable; the nucleus decays spontaneously, giving off detectable particles and energy.
- A virus that infects bacteria; also called a phage.
- An enzyme that catalyzes the lengthening of telomeres in eukaryotic germ cells.
5 True/False questions
phage → A virus that infects bacteria; also called a bacteriophage.
DNA ligase → A linking enzyme essential for DNA replication; catalyzes the covalent bonding of the 3' end of one DNA fragment (such as an Okazaki fragment) to the 5' end of another DNA fragment (such as a growing DNA chain).
deoxyribose → The sugar component of DNA nucleotides, having one fewer hydroxyl group than ribose, the sugar component of RNA nucleotides.
nucleosome → 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.
chromatin → 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.