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.
The first part of the DNA double helix in the cell nucleus unwinds and unzips. The DNA instruction is revealed, flanked by 'start' and 'stop' codes. The cell makes a copy of the DNA in the form of an RNA molecule. The RNA copy is trimmed, and then enters the cell cytoplasm to be decoded. It is now called messenger RNA (mRNA). Back to top. Play. RNA encodes 'start' and 'stop' codons.