Each person normally has one pair of sex chromosomes in each cell. Females have two X chromosomes, while males have one X and one Y chromosome. Early in embryonic development in females, one of the two X chromosomes is randomly and permanently inactivated in cells other than egg cells.
Lesson Summary. You should now understand that DNA helicase has a very important job to do. It is responsible for opening up our DNA to allow for replication as well as transcription of our DNA. A DNA helicase is an enzyme that functions by melting the hydrogen bonds that hold the DNA into the double helix structure.hat is, until they meet DNA helicase. In order for DNA polymerase (in replication) or RNA polymerase (in transcription) to see the nucleotide bases that are to be used as a template, these hydrogen bonds must be broken to expose the much-needed the nucleotide bases.
Helicase is also known as a motor protein due to its ability to move down the double-stranded DNA strand and unzip it into two single strands. While unwinding the DNA strands, helicase converts chemical energy from ATP or NTP into mechanical energy. This enzyme is a key component of DNA replication, transcription and translation. Without helicase, DNA would not be able to unwind and undergo either process, and cells would not be able to divide.