Nitrogen (N) normally forms three covalent bonds with a valence of five. However, ammonium has four covalent bonds, each to a different hydrogen (H) atom (H has a valence of one). What do you predict to be the charge on ammonium?

#Question id: 3687

#Section 3: Genetics, Cellular and Molecular Biology

As the two strands of the double helix are separated, the positive supercoiling interferes with the further unwinding of DNA. Which of the following enzyme makes a break in a strand of DNA to release the supercoiling and facilitate the replication to occur?

#Question id: 3688

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following enzyme has a unique ability to introduce positive and negative supercoiling of the DNA and it is the target for antibacterial agents such as ciprofloxacin/quinolones?

#Question id: 3689

#Section 3: Genetics, Cellular and Molecular Biology

DNA replication is bidirectional and anti-parallel. Which of the statement is FALSE regarding the DNA replication?

#Question id: 3690

#Section 3: Genetics, Cellular and Molecular Biology

The DNA polymerase is a template-directed enzyme that synthesizes new complementary strand from a parent strand but it requires the existing short nucleotide sequence for its elongation. Which of the following enzyme is required for the synthesis of this primer?

#Question id: 3691

#Section 3: Genetics, Cellular and Molecular Biology

 DNA polymerase III holoenzyme possesses:

#Question id: 3692

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following statement is true regarding an enzyme DNA polymerase that catalyzes the elongation of complementary DNA strand?