5 Written questions
5 Matching questions
- replication fork
- repetitive DNA
- a Eukaryotic chromatin that remains highly compacted during interphase and is generally not transcribed.
- b A Y-shaped region on a replicating DNA molecule where the parental strands are being unwound and new strands are growing.
- c 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.
- d 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.
- e 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.
5 Multiple choice questions
- 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 discontinuously synthesized DNA strand that elongates by means of Okazaki fragments, each synthesized in a 5'3' direction away from the replication fork.
- A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.
- An enzyme that joins RNA nucleotides to make the primer using the parental DNA strand as a template.
- One of two prokaryotic domains, the other being Archaea.
5 True/False questions
helicase → An enzyme that untwists the double helix of DNA at the replication forks, separating the two strands and making them available as template strands.
pyrimidine → 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.
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 → A virus that infects bacteria; also called a phage.
telomerase → An enzyme that catalyzes the lengthening of telomeres in eukaryotic germ cells.