Freebase(0.00 / 0 votes)Rate this definition: Bollard. A bollard is a short vertical post. Originally it meant a post used on a ship or a quay, principally for mooring. The word now also describes a variety of structures to control or direct road traffic, such as posts arranged in a line to obstruct the passage of motor vehicles.
Which of the following events occurs directly after a DNA molecule is unzipped? A. Mismatched nucleotide bases are identified and replaced. B. Free-floating nucleotides pair up with exposed bases.hich of the following events occurs directly after a DNA molecule is unzipped? A. Mismatched nucleotide bases are identified and replaced. B. Free-floating nucleotides pair up with exposed bases.
There are several enzymes that 'unzip' DNA. These enzymes are collectively known as DNA helicases. DNA helicases are helix-destabilizing enzymes that bind to DNA at the origi â¦ n of replication and break hydrogen bonds, thereby separating the two strands..  Solomon, Eldra P., Linda R. Berg, and Diana W. Martin.Biology. 8th ed. Belmont, CA: Thomson Brooks/Cole, 2008. 270.NA helicases are helix-destabilizing enzymes that bind to DNA at the origi â¦ n of replication and break hydrogen bonds, thereby separating the two strands..   Solomon, Eldra P., Linda R. Berg, and Diana W. Martin. Biology. 8th ed.