5 Written questions
5 Matching questions
- x-ray crystallography
- semiconservative model
- 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 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.
- c A small protein with a high proportion of positively charged amino acids that binds to the negatively charged DNA and plays a key role in chromatin structure.
- d 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.
- 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
- The DNA strand that provides the pattern, or template, for ordering the sequence of nucleotides in an RNA transcript.
- 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.
- The cellular process that uses specific enzymes to remove and replace incorrectly paired nucleotides.
- 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.
- 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.
5 True/False questions
nucleoid region → 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.
radioactive isotope → An isotope (an atomic form of a chemical element) that is unstable; the nucleus decays spontaneously, giving off detectable particles and energy.
euchromatin → The less condensed form of eukaryotic chromatin that is available for transcription.
origin of replication → Site where the replication of a DNA molecule begins, consisting of a specific sequence of nucleotides.
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.