5 Written questions
5 Matching questions
- Lagging strand
- DNA polymerase
- x-ray crystallography
- 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 virus that infects bacteria; also called a bacteriophage.
- c A discontinuously synthesized DNA strand that elongates by means of Okazaki fragments, each synthesized in a 5'3' direction away from the replication fork.
- d 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.
- e (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.
5 Multiple choice questions
- A protein that binds to the unpaired DNA strands during DNA replication, stabilizing them and holding them apart while they serve as templates for the synthesis of complementary strands of DNA.
- An isotope (an atomic form of a chemical element) that is unstable; the nucleus decays spontaneously, giving off detectable particles and energy.
- One of two prokaryotic domains, the other being Archaea.
- A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.
- Member of the prokaryotic domain Bacteria.
5 True/False questions
Mismatch repair → The cellular process that uses specific enzymes to remove and replace incorrectly paired nucleotides.
Leading strand → A discontinuously synthesized DNA strand that elongates by means of Okazaki fragments, each synthesized in a 5'3' direction away from the replication fork.
replication fork → A Y-shaped region on a replicating DNA molecule where the parental strands are being unwound and new strands are growing.
semiconservative model → Nucleotide sequences, usually noncoding, that are present in many copies in a eukaryotic genome. The repeated units may be short and arranged tandemly (in series) or long and dispersed in the genome.
histone → An enzyme that joins RNA nucleotides to make the primer using the parental DNA strand as a template.