Why does a new DNA strand elongate?
A new DNA strand elongates only in the 5′ to 3′ direction because DNA polymerase can only add nucleotides to a free 3′ end of the growing strand or to the 3′ end of the primer.
What is DNA strand elongation?
DNA strand elongation involved in DNA replication The process in which an existing DNA strand is extended by activities including the addition of nucleotides to the 3′ end of the strand, complementary to an existing template, as part of DNA replication.
How are the new strands of DNA lengthened?
What does DNA replication do? How are new strands of DNA lengthened? New strands of DNA are lengthened by adding new nucleotides at the replication fork. What rule ensures that two new DNA strands are identical to the original strand?
What is the nature of the new strand DNA chain elongation?
Elongation. Finally, elongation–the addition of nucleotides to the new DNA strand–begins after the primer has been added. Synthesis of the growing strand involves adding nucleotides, one by one, in the exact order specified by the original (template) strand.
Why does a new DNA strand elongate only in the 5 to 3 direction during DNA replication chegg?
Question: Why does a new DNA strand elongate only in the 5′ to 3′ direction during DNA replication? The polarity of the DNA molecule prevents addition of nucleotides at the 3′ en Replication must progress toward the replication fork. DNA polymerase can add nucleotides only to the free 3′ end.
What is the role of DNA ligase in the elongation?
What is the role of DNA ligase in the elongation of the lagging strand during DNA replication? It joins Okazaki fragments together. An enzyme that joins RNA nucleotides to make the primer using the parental DNA strand as a template.
Which of the following describes what occurs during the elongation stage of DNA replication?
During elongation, a primer sequence is added with complementary RNA nucleotides, which are then replaced by DNA nucleotides. During elongation the leading strand is made continuously, while the lagging strand is made in pieces called Okazaki fragments.
What energy source drives the elongation of DNA new strands?
The process uses a complementary, single strand of DNA as a template. The energy required to drive the reaction comes from cutting high energy phosphate bonds on the nucleotide-triphosphate’s used as the source of the nucleotides needed in the reaction.
Which of the following builds new strands of DNA?
Which of the following builds new strands of DNA? DNA polymerase is an enzyme that builds new strands of DNA.
Which is the main event of transcription elongation?
Basically, elongation is the stage when the RNA strand gets longer, thanks to the addition of new nucleotides. During elongation, RNA polymerase “walks” along one strand of DNA, known as the template strand, in the 3′ to 5′ direction.
What is the role of DNA ligase in the elongation of the lagging strand during DNA replication?
What happens to histones during transcription elongation?
During elongation, the transcription machinery needs to move histones out of the way every time it encounters a nucleosome. Transcription elongation occurs in a bubble of unwound DNA, where the RNA Polymerase uses one strand of DNA as a template to catalyze the synthesis of a new RNA strand in the 5′ to 3′ direction.
What happens to pre mRNA during elongation and termination?
Elongation synthesizes pre-mRNA in a 5′ to 3′ direction, and termination occurs in response to termination sequences and signals. Describe what is happening during transcription elongation and termination
What happens to the lagging strand during DNA replication?
Because replication proceeds in the 5′ to 3′ direction on the leading strand, the newly formed strand is continuous. The lagging strand begins replication by binding with multiple primers. Each primer is only several bases apart. DNA polymerase then adds pieces of DNA, called Okazaki fragments, to the strand between primers.
Where does elongation and termination occur in the cell?
Transcription through Nucleosomes. Elongation. Termination. Elongation synthesizes pre-mRNA in a 5′ to 3′ direction, and termination occurs in response to termination sequences and signals.