5 Written questions
5 Matching questions
- Leading strand
- semiconservative model
- a 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.
- b (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.
- c The new complementary DNA strand synthesized continuously along the template strand toward the replication fork in the mandatory 5'?3' direction.
- d A virus that infects bacteria; also called a phage.
- e 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.
5 Multiple choice questions
- 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.
- An enzyme that catalyzes the elongation of new DNA (for example, at a replication fork) by the addition of nucleotides to the 3' end of an existing chain. There are several different DNA polymerases; DNA polymerase III and DNA polymerase I play major roles in DNA replication in prokaryotes.
- 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 less condensed form of eukaryotic chromatin that is available for transcription.
- A dense region of DNA in a prokaryotic cell.
5 True/False questions
nucleosome → 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.
telomere → 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.
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.
x-ray crystallography → A virus that infects bacteria; also called a phage.
deoxyribose → The sugar component of DNA nucleotides, having one fewer hydroxyl group than ribose, the sugar component of RNA nucleotides.