5 Written questions
5 Matching questions
- Okazaki fragment
- a 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.
- b 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.
- c One of two prokaryotic domains, the other being Archaea.
- d 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.
- e The sugar component of DNA nucleotides, having one fewer hydroxyl group than ribose, the sugar component of RNA nucleotides.
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 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.
- A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.
- 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.
- 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
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.
Mismatch repair → The cellular process that uses specific enzymes to remove and replace incorrectly paired nucleotides.
semiconservative model → 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.
double helix → The form of native DNA, referring to its two adjacent antiparallel polynucleotide strands wound around an imaginary axis into a spiral shape.
nuclease → A dense region of DNA in a prokaryotic cell.