Why is it so important for DNA replication to be accurate?
In order for a cell to divide, it must first make a copy of its own DNA, which is the genetic code it needs to function properly. It is very important that your DNA is replicated accurately, with new cells receiving an exact copy of your genetic sequence.
How can an error in DNA replication possibly cause a mutation?
A mutation is a change that occurs in our DNA sequence, either due to mistakes when the DNA is copied or as the result of environmental factors such as UV light and cigarette smoke. Mutations can occur during DNA replication if errors are made and not corrected in time.
Can DNA polymerase catch and correct every replication error?
DNA replication needs to occur so that every (cell/organism) will have a complete set of DNA following cell division. Cell. DNA polymerase has a proofreading function that enables it to detect (errors/enzymes) and correct them.
What indicates where translation is to stop?
Cells decode mRNAs by reading their nucleotides in groups of three, called codons. Each codon specifies a particular amino acid, or, in some cases, provides a “stop” signal that ends translation. In addition, the codon AUG has a special role, serving as the start codon where translation begins.
What are agents in the environment that can change DNA?
Mutagens: A Direct Route into the Nucleus Although small molecules can lead to phenotypic changes via cell signaling, other environmental agents find more direct routes into a cell’s nucleus. These agents are known as mutagens, and they act by directly altering a cell’s DNA sequence.
What enzyme helps a cell to make a strand of DNA?
What must occur before DNA can replicate?
Before a cell divides, its DNA is replicated (duplicated.) Before replication can occur, the length of the DNA double helix about to be copied must be unwound. In addition, the two strands must be separated, much like the two sides of a zipper, by breaking the weak hydrogen bonds that link the paired bases.
Which of the following are steps in DNA replication?
There are three main steps to DNA replication: initiation, elongation, and termination. In order to fit within a cell’s nucleus, DNA is packed into tightly coiled structures called chromatin, which loosens prior to replication, allowing the cell replication machinery to access the DNA strands.
What is the meaning of replication?
1 : the action or process of reproducing or duplicating replication of DNA. 2 : performance of an experiment or procedure more than once. replication. noun. rep·li·ca·tion | \ ˌre-plə-ˈkā-shən \