5 Written questions
5 Matching questions
- Lagging strand
- semiconservative model
- a An enzyme that joins RNA nucleotides to make the primer using the parental DNA strand as a template.
- b 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.
- c 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.
- d 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.
- e A discontinuously synthesized DNA strand that elongates by means of Okazaki fragments, each synthesized in a 5'3' direction away from the replication fork.
5 Multiple choice questions
- 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.
- A virus that infects bacteria; also called a phage.
- A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.
- 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.
- (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 True/False questions
deoxyribose → An enzyme that untwists the double helix of DNA at the replication forks, separating the two strands and making them available as template strands.
x-ray crystallography → 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.
nucleoid region → A dense region of DNA in a prokaryotic cell.
origin of replication → (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.
telomerase → 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.