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.
Replicating DNA. The dsDNA strand is unzipped by helicase and DNA synthesis occurs at the Y-shaped replication fork in the five prime (5â) to three prime (3â) direction. DNA has a direction because it is an asymmetrical molecule and the direction of the strand is determined by the orientation of the deoxyribose sugar.