Concept explainers
Videos
Why is
To explain: The reason why DNA replication is called “semiconservative”.
Introduction: Deoxyribonucleic acid (DNA) is the genetic material of prokaryotes, archaea, eukaryotes, and some viruses. Replication of DNA results in two copies of DNA that are split into two cells at the end of cell division. Replication is the starting mechanism in the central dogma.
Explanation of Solution
There are three proposed models of DNA replication:
- • Conservative model
- • Semiconservative model
- • Dispersive model.
Semiconservative model is the widely accepted and experimentally proved model. According to this model, each copy of the DNA replicated contains a parent strand.
Meselson–Stahl experiment supported the Watson and Crick model of DNA and provided evidences for semiconservative model of DNA replication.
In semiconservative replication, the two strands of parental DNA are used as a template each and a new strand is synthesized with enzymes and nucleotides. Thus, each daughter strand has a parental strand and a newly synthesized strand. Since a parental strand is conserved in daughter DNA, it is called semiconservative DNA replication.
Want to see more full solutions like this?
- If the sequence of one single strand of DNA is C-A-A-G-T-A-G-G-C-T, what is the sequence of the complementary strand? Describe the origin of each strand of the new double helices created after DNA replication. Why is DNA replication important to the growth and development of a multicellular organism? Place the following terms in the correct order from smallest to largest: Nucleosome, supercoils, coils, chromosome, DNA double helixarrow_forwardDescribe the three properties of DNA replication.arrow_forwardWhy is replication important?arrow_forward
- Why is DNA replication considered semi-conservative? answer this in a few sentences (short answer) Why does the genetic code use codons that always consist of 3 nucleotides? answer this in a few sentences (short answer)arrow_forwardWhat is origion of replication?arrow_forwardWhy does DNA have a leading strand and a lagging strand during replication?Select the correct row below that fills in the following blanks to answer the question above.___1st___ has to attach the new free-floating nucleotides to the ___2nd___ of the newly formed strand. The two strands of a DNA molecule are antiparallel, so in order for the lagging strand to be formed in the same direction, it has to be done in Okazaki fragments going in a ___3rd___ direction. Select one: a. 1st 2nd 3rd DNA polymerase 3' end 5' to 3' b. 1st 2nd 3rd DNA polymerase 5' end 3' to 5' c. 1st 2nd 3rd DNA ligase 3' end 5' to 3' d. 1st 2nd 3rd DNA helicase 5' end 3' to 5'arrow_forward
- Two important proteins in DNA replication are (select two): Cdx2 Cdt2 Cdc6 Cdc6 Cdt1 Cdc5arrow_forwardWhat happens to DNA replication if DNA polymerase III and DNA polymerase I are defective?arrow_forwardWhich enzyme is missing in a cell where replication bubbles form and RNA primers are present but no DNA replication takes place?arrow_forward
Human Biology (MindTap Course List)BiologyISBN:9781305112100Author:Cecie Starr, Beverly McMillanPublisher:Cengage Learning
Biology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning