5 Written questions
5 Matching questions
- DNA ligase
- template strand
- Single-strand DNA-binding protein (SSBPs)
- x-ray crystallography
- a A linking enzyme essential for DNA replication; catalyzes the covalent bonding of the 3' end of one DNA fragment (such as an Okazaki fragment) to the 5' end of another DNA fragment (such as a growing DNA chain).
- b 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.
- c 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.
- d The DNA strand that provides the pattern, or template, for ordering the sequence of nucleotides in an RNA transcript.
- e 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.
5 Multiple choice questions
- The sugar component of DNA nucleotides, having one fewer hydroxyl group than ribose, the sugar component of RNA nucleotides.
- The cellular process that uses specific enzymes to remove and replace incorrectly paired nucleotides.
- A dense region of DNA in a prokaryotic cell.
- (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 untwists the double helix of DNA at the replication forks, separating the two strands and making them available as template strands.
5 True/False questions
Lagging strand → A discontinuously synthesized DNA strand that elongates by means of Okazaki fragments, each synthesized in a 5'3' direction away from the replication fork.
bacterium → One of two prokaryotic domains, the other being Archaea.
bacteria → Member of the prokaryotic domain Bacteria.
repetitive DNA → 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.
nucleotide excision repair → A repair system that removes and then correctly replaces a damaged segment of DNA using the undamaged strand as a guide.