Chapter 11 Flashcards
describe selenocysteine and pyrrolysine
They are unusual amino acids found in some bacteria and archaea.
Which statement best describes DNA polymerase I?
It has exonuclease activity.
DNA polymerase III adds DNA nucleotides in which directions?
in the 5′ to 3′ direction only
What is another name for the template strand (the strand of DNA that is transcribed)?
antisense strand
Which researchers provided evidence that DNA replication was semiconservative?
Matthew Meselson and Franklin Stahl
Which of the following correctly explains why DNA replication is described as semiconservative?
Each daughter strand contains one old strand and one new strand.
Telomerase in humans is generally active in which cells?
in stem cells and germ cells
Following DNA replication, bacterial chromosomes become which of the following?
concatenated
What does the σ factor recognize?
the –35 consensus sequence in prokaryotes
Which of the following removes the primers during DNA replication in bacteria?
DNA polymerase I
During DNA replication, the lagging strand is formed from which of the following?
Okazaki fragments
Telomeres are found in which of the following?
fungal, protist, plant, and animal chromosomes
What describes one difference between prokaryotic and eukaryotic DNA replication?
Eukaryotes have more origins of replication than prokaryotes.
What defines a sigma () factor?
a subunit of prokaryotic RNA polymerase that is important in binding to DNA
What is the function of the σ factor?
It allows RNA polymerase to recognize a specific promoter in prokaryotes.
