5 Written questions
5 Matching questions
- x-ray crystallography
- Okazaki fragment
- 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 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.
- c One of two types of nitrogenous bases found in nucleotides, characterized by a six-membered ring. Cytosine (C), thymine (T), and uracil (U) are pyrimidines.
- d A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.
- e An enzyme that untwists the double helix of DNA at the replication forks, separating the two strands and making them available as template strands.
5 Multiple choice questions
- The form of native DNA, referring to its two adjacent antiparallel polynucleotide strands wound around an imaginary axis into a spiral shape.
- (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.
- An enzyme that joins RNA nucleotides to make the primer using the parental DNA strand as a template.
- The new complementary DNA strand synthesized continuously along the template strand toward the replication fork in the mandatory 5'?3' direction.
- 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.
radioactive isotope → An isotope (an atomic form of a chemical element) that is unstable; the nucleus decays spontaneously, giving off detectable particles and energy.
telomere → An enzyme that catalyzes the lengthening of telomeres in eukaryotic germ cells.
DNA ligase → An enzyme that untwists the double helix of DNA at the replication forks, separating the two strands and making them available as template strands.
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.