What is continuous and discontinuous DNA synthesis? - Studybuff (2023)

discontinuous replication The synthesis of a new strand of a replicating DNA molecule as a series of short fragments that are subsequently joined together. … The other strand (leading strand) is synthesized by continuous addition of nucleotides to the growing end, i.e. continuous replication.

Where does continuous synthesis occur?

leading strand On the leading strand, DNA synthesis occurs continuously. On the lagging strand, DNA synthesis restarts many times as the helix unwinds, resulting in many short fragments called “Okazaki fragments.” DNA ligase joins the Okazaki fragments together into a single DNA molecule.

What is the difference between continuous and discontinuous replication?

Replication can only take place in the forward direction of each strand. As a result, one strand is copied continuously in the forward direction while the other is copied discontinuously in segments that are later joined.

What strand is continuously synthesized?

leading strand The leading strand is synthesized continuously, whereas the lagging strand is synthesized in short pieces termed Okazaki fragments.

What is continuous synthesis of DNA?

On the lower leading strand, synthesis is continuous because extension of a single RNA primer occurs without interruption into the replication fork as it continues to open to the right. … In fact, DNA synthesis occurs as a single process involving a dimeric polymerase molecule situated at the RF.

What is discontinuous process?

adjective. A process that is discontinuous happens in stages with intervals between them, rather than continuously.

What is the role of topoisomerase?

Topoisomerase: A class of enzymes that alter the supercoiling of double-stranded DNA. (In supercoiling the DNA molecule coils up like a telephone cord, which shortens the molecule.) The topoisomerases act by transiently cutting one or both strands of the DNA.

What is the reason for continuous and discontinuous replication of the two standard of a DNA molecule?

The property that is responsible for continuous and discontinuous replication of the two strands of a DNA molecule is that the enzyme catalyzes the polymerization of nucleotides in the 5′ to 3′ direction.

What is continuous replication in biology?

Difference # Continuous Replication: Occurs on leading of a replication fork. … Progresses in on direction, i.e., towards the replication fork. 4. Synthesis of DNA takes place continuously.

Why does discontinuous synthesis of DNA occur in one strand?

(b) Discontinuous synthesis of DNA occurs in one strand, because DNA dependent DNA polymerase catalyses polymerisation only in one direction (5′ → 3′).

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What is discontinuous DNA?

Discontinuous DNA synthesis occurs from the 5′ end to the 3′ end of the parent strand. This strand is often referred to as the lagging strand. It is completed in short sequences of nucleotides called Okazaki fragments. Replication on the lagging strand begins with the addition of an RNA primer by the enzyme primase.

Why does DNA replication require both continuous synthesis on the leading strand and discontinuous synthesis on the lagging strand?

These fragments are joined together by DNA Ligase. Hence the replication of this strand is discontinuous. Whereas the leading strand runs in the same direction as the direction required for replication by DNA Polymerase(5′ to 3′) so the replication is continuous. Plz mark it as brainliest.

In what direction is DNA synthesized?

5′-to-3′ direction DNA is always synthesized in the 5′-to-3′ direction, meaning that nucleotides are added only to the 3′ end of the growing strand. As shown in Figure 2, the 5′-phosphate group of the new nucleotide binds to the 3′-OH group of the last nucleotide of the growing strand.

What does DNA polymerase do?

DNA polymerase is responsible for the process of DNA replication, during which a double-stranded DNA molecule is copied into two identical DNA molecules. Scientists have taken advantage of the power of DNA polymerase molecules to copy DNA molecules in test tubes via polymerase chain reaction, also known as PCR.

Does DNA ligase remove primers?

DNA ligase I is responsible for joining Okazaki fragments together to form a continuous lagging strand. Because DNA ligase I is unable to join DNA to RNA, the RNA-DNA primers must be removed from each Okazaki fragment to complete lagging strand DNA synthesis and maintain genomic stability.

What is continuous synthesis class 12?

Continuous synthesis takes place in the Leading strand. In this strand, DNA is synthesized in the same direction as the growing replication fork. Observe the direction of movement of Helicase & DNA polymerase.

What happens when DNA is replicated?

DNA replication is the process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules. … Once the DNA in a cell is replicated, the cell can divide into two cells, each of which has an identical copy of the original DNA.

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Why is DNA only synthesized from 5 to 3?

DNA polymerase adds nucleotides to the deoxyribose (3′) ended strand in a 5′ to 3′ direction. … Nucleotides cannot be added to the phosphate (5′) end because DNA polymerase can only add DNA nucleotides in a 5′ to 3′ direction. The lagging strand is therefore synthesised in fragments.

What is discontinuous distribution?

a distribution in which populations of related organisms are found in widely separated parts of the world, e.g. lung flukes in Australia, Africa and South America. Such a distribution is thought to indicate the great age of the group, with intermediate populations having become extinct.

What is a discontinuity in a function?

Discontinuous functions are functions that are not a continuous curve – there is a hole or jump in the graph. It is an area where the graph cannot continue without being transported somewhere else.

What does discontinuous mean in science?

A characteristic of any species with only a limited number of possible values shows discontinuous variation . Human blood group is an example of discontinuous variation. … There are no values in between, so this is discontinuous variation.

What is the function of exonuclease?

Exonucleases are key enzymes involved in many aspects of cellular metabolism and maintenance and are essential to genome stability, acting to cleave DNA from free ends.

What is the function of helicase?

Helicases are enzymes that bind and may even remodel nucleic acid or nucleic acid protein complexes. There are DNA and RNA helicases. DNA helicases are essential during DNA replication because they separate double-stranded DNA into single strands allowing each strand to be copied.

What is the role of DNA ligase?

DNA ligases play an essential role in maintaining genomic integrity by joining breaks in the phosphodiester backbone of DNA that occur during replication and recombination, and as a consequence of DNA damage and its repair. Three human genes, LIG1, LIG3 and LIG4 encode ATP-dependent DNA ligases.

How is the discontinuous strand connected into a continuous strand?

Discontinuous DNA Replication As polymerase molecule only works in the parallel direction, DNA replication on this strand can only occur in segments, away from the replication fork. … Eventually, these fragments are rejoined together by the enzyme DNA ligase, creating a continuous strand.

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Why is DNA replication continuous and discontinuous in replication fork?

a) For long DNA molecules, since the two strands of DNA cannot be separated in its entire length (due to very high energy requirement), polymerization takes place only in one direction which is 5′-3′, hence the replication occur within a small opening of the DNA helix, referred to as replication fork.

Why is half of DNA replication in a discontinuous fashion?

Explain why half of DNA is replicated in a discontinuous fashion. Replication of the lagging strand occurs in the direction away from the replication fork in short stretches of DNA, since access to the DNA is always from the 5′ end. This results in pieces of DNA being replicated in a discontinuous fashion.

What is a telomere and what does it do?

A telomere is a repeating DNA sequence (for example, TTAGGG) at the end of the body’s chromosomes. The telomere can reach a length of 15,000 base pairs. Telomeres function by preventing chromosomes from losing base pair sequences at their ends. They also stop chromosomes from fusing to each other.

Why is DNA replication semi continuous?

When the double helix of DNA unwinds, DNA replication on one of the two strands (3′ to 5′ stand) can easily proceed continuously in 5′ to 3′ direction. … This behaviour where the leading strand is synthesized continuously and the lagging strand is synthesized discontinuously is called semi-discontinuous replication.

What is the difference between replicated and duplicated?

Duplicate means to make an exact copy and can also be used as an adjective and a noun. Replicate means to reproduce something, and can also be used as an adjective and a noun.

What is continuous and discontinuous DNA synthesis? - Studybuff (1)

Perrine Juillion

Graduated from ENSAT (national agronomic school of Toulouse) in plant sciences in 2018, I pursued a CIFRE doctorate under contract with Sun’Agri and INRAE ​​in Avignon between 2019 and 2022. My thesis aimed to study dynamic agrivoltaic systems, in my case in arboriculture. I love to write and share science related Stuff Here on my Website. I am currently continuing at Sun’Agri as an R&D engineer.

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