Practice Quiz-4 PDF

Practice Quiz- 4 1. An actively dividing bacterial culture is grown in a medium containing radioactive adenine (A*). After all the adenine is labeled, the bacteria are transferred to a medium containing nonradioactive adenine (A). Following one round of DNA replication in the nonradioactive medium,...

Practice Quiz- 4 1. An actively dividing bacterial culture is grown in a medium containing radioactive adenine (A*). After all the adenine is labeled, the bacteria are transferred to a medium containing nonradioactive adenine (A). Following one round of DNA replication in the nonradioactive medium, the DNA is analyzed. Which of the following sequences could represent this DNA? A. A* A* T T G A* T C T T AACT AG B. A* A T T G A* T C T T A* A* C T A G C. A A T T G A T C TTAACTAG D. A* A* T T G A* T C T T A* A* C T A* G 2. _______________ join DNA fragments to the lagging strand. A. Telomere B. Centromere C. DNA Ligase D. Helicase E. Antiparallel strands 3. What is the function of 3’-5’ exonuclease activity in DNA polymerase III? A. B. C. D. E. DNA break repair Removal of Okazaki fragments Proof-reading of RNA primers Proof-reading of the nascent DNA All of the above 4. A cell can pass certain types of chromatin structure to daughter cells during cell reproduction. What molecules are key to this type of inheritance? A. DNA molecules B. Histone molecules C. RNA molecules D. Sugar residues E. Poly phosphates 5. Telomeres: A) contain repeated nucleotide sequences that are required for the ends of chromosome B) allow duplicated chromosomes to become attached during M phase C) cap the ends of the DNA molecule and prevent them from being recognized by the cell as broken DNA in need of repair D) A and C only E) B and C only 6. Initiation of Eukaryotic DNA replication is regulated by A) histone phosphorylation B) the levels of histone proteins C) phosphorylation of ORC and MCM helicase D) topoisomerase I E) DNA ligase 7. DNA replication occurs at A) G1 and S phases B) G2 phase C) S phase D) S and G2 phases E) M phase 8. DNA polymerase requires _________ to start DNA synthesis A) replication origin B) Primer C) to be activated by phosphorylation D) to be associated with histone E) None of the above