5 Written questions
5 Matching questions
- template strand
- replication fork
- Single-strand DNA-binding protein (SSBPs)
- a 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.
- b The DNA strand that provides the pattern, or template, for ordering the sequence of nucleotides in an RNA transcript.
- c A Y-shaped region on a replicating DNA molecule where the parental strands are being unwound and new strands are growing.
- d 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.
- e A virus that infects bacteria; also called a bacteriophage.
5 Multiple choice questions
- 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.
- 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.
- 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.
- 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.
- A dense region of DNA in a prokaryotic cell.
5 True/False questions
radioactive isotope → A virus that infects bacteria; also called a phage.
topoisomerase → 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.
bacteriophage → A virus that infects bacteria; also called a phage.
Leading 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.
DNA polymerase → 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).