what would happen if, in the course of replication, the

What would happen if, in the course of replication, the topoisomerases were unable to reattach the DNA fragments of each strand after unwinding (relaxing) the DNA molecule? Answer: The chromosome would become hopelessly fragmented. Which of the following would happen if DNA synthesis were discontinuous on both strands?

Full Answer

What must occur before replication can begin?

• Which enzyme breaks the hydrogen bonds holding the two strands of DNA together so that replication can occur?
• Is it the lagging strand or the leading strand that is synthesized in the direction toward the opening of the replication fork?
• Which enzyme is responsible for removing the RNA primers in newly replicated bacterial DNA?

What holds DNA apart during replication?

What keeps the two DNA strands separate during replication? DNA helicase Explanation: DNA helicase unwinds the double helix, separating the two strands so they may be replicated by DNA polymerase. Primase adds an RNA primer to help initiate DNA replication.

What occurs during the process of replication?

Replication is the process in which a cell makes an exact copy of its own DNA (copy DNA -> DNA). Replication occurs in the S-fase in preparation to cell division during which the genetic information for the synthesis of proteins is transfered from the mothercell to the daughtercell.

What end product is formed during replication?

The result of DNA replication is two DNA molecules consisting of one new and one old chain of nucleotides. This is why DNA replication is described as semi-conservative, half of the chain is part of the original DNA molecule, half is brand new.

What will happen if the DNA failed to replicate?

The DNA replication occurs at the synthesis phase of the cell cycle. The cell cycle is regulated at each stage. If DNA replication does not occur, then the cell cycle will not proceed to the next stage and the subsequent division will not happen. It will lead to cell death.

What would happen if a mistake occurred during replication?

When Replication Errors Become Mutations. Incorrectly paired nucleotides that still remain following mismatch repair become permanent mutations after the next cell division. This is because once such mistakes are established, the cell no longer recognizes them as errors.

What happens when DNA is being replicated?

The result of DNA replication is two DNA molecules consisting of one new and one old chain of nucleotides. This is why DNA replication is described as semi-conservative, half of the chain is part of the original DNA molecule, half is brand new.

What happens during replication and when does it occur?

Replication occurs in three major steps: the opening of the double helix and separation of the DNA strands, the priming of the template strand, and the assembly of the new DNA segment. During separation, the two strands of the DNA double helix uncoil at a specific location called the origin.

How can a mutation during replication affect the DNA?

Mutagens cause mutations in three different ways: Some act as base analogs and are mistakenly used as substrates when new DNA is synthesized at the replication fork. Some react directly with DNA, causing structural changes that lead to miscopying of the template strand when the DNA is replicated.

What are some of the possible consequences of mutations in DNA replication?

By the same token, any random change in a gene's DNA is likely to result in a protein that does not function normally or may not function at all. Such mutations are likely to be harmful. Harmful mutations may cause genetic disorders or cancer. A genetic disorder is a disease caused by a mutation in one or a few genes.

What would happen if DNA was not replicated prior to cell division?

Explanation. If DNA was not replicated before cell division, one of the daughter cells would receive the whole DNA, while the other daughter cell would not receive any of genetic information from the parent cell.

What is DNA replication quizlet?

DNA replication definition. the process in which one DNA molecule produces two identical DNA molecules, occurs before the cell divides.

Why DNA must be replicated?

Cells must replicate their DNA before they can divide. This ensures that each daughter cell gets a copy of the genome, and therefore, successful inheritance of genetic traits. DNA replication is an essential process and the basic mechanism is conserved in all organisms.

Which of the following occurs during replication?

​Which of the following occurs during replication? ​Each new cell receives copies of all the original chromosomes. ​microtubules.

What is DNA replication and how does it work?

Definition. DNA replication is the process by which the genome's DNA is copied in cells. Before a cell divides, it must first copy (or replicate) its entire genome so that each resulting daughter cell ends up with its own complete genome.

Where does DNA replication happen?

the nucleusDNA replication occurs in the nucleus in eukaryotic cells and in the nucleoid region of prokaryotic cells. Eukaryotic cells are cells that have a nucleus and membrane bound organelles, such as plant cells and animal cells. Eukaryotic cells contain their DNA in the nucleus, and thus this is where DNA replication occurs.

Which stage of the cell cycle is DNA replicated?

nucleus. DNA is replicated during the (M stage / S stage) of the cell cycle. S stage. DNA replication needs to occur so that every (cell / organism) will have a complete set of DNA following cell division. cell.

Why is DNA replication considered semiconservative?

DNA replication is called semiconservative because each molecule consists of one . . . strand and one . . . strand. new. old. Human chromosomes have (only one / hundreds of) origin(s) of replication, where the DNA is unzipped so replication can begin. hundreds of.