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.
So in RNA the important base pairs are: adenine (A) pairs with uracil (U); guanine (G) pairs with cytosine (C). Transcription Transcription is the name given to the process where the information in a gene in a DNA strand is transferred to an RNA molecule.The coding strand and the template strand of DNA The important thing to realise is that the genetic information is carried on only one of the two strands of the DNA.he structure of RNA The function of messenger RNA in the cell You will probably know that the sequence of bases in DNA carries the genetic code. Scattered along the DNA molecule are particularly important sequences of bases known as genes. Each gene is a coded description for making a particular protein.