Ramesh
- Rate ₹2,000
- Response 1h
₹2,000/hr
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- Maths
- Physics
I am tutor with 20 years of experience teaching mathematics to students across the globe
- Maths
- Physics
Class location
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At Ramesh 's house : New Delhi
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at your home or a public place : will travel up to 20 km from New Delhi
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About Ramesh
The advantage of using DNA polymerases from thermophilic organisms, such as Thermus aquaticus (Taq polymerase), in polymerase chain reaction (PCR) is primarily due to their thermostability.
Thermophilic DNA polymerases are adapted to high temperatures and can withstand the high temperatures used in the denaturation step of PCR, typically around 94-98°C. This thermostability allows the enzyme to remain active throughout the PCR process, even when the reaction is subjected to repeated cycles of heating and cooling.
The main advantages of using thermostable DNA polymerases in PCR are:
1. **Robustness**: Thermostable DNA polymerases can withstand the denaturation temperatures required to separate the DNA strands without denaturing themselves. This ensures the enzyme remains active throughout the PCR process.
2. **Efficiency**: The stability of thermophilic DNA polymerases allows for efficient amplification of target DNA sequences, even in complex samples containing inhibitors or contaminants.
3. **Minimal optimization**: Thermostable DNA polymerases are less prone to degradation and denaturation, reducing the need for optimization of PCR conditions and reaction setups.
4. **High-fidelity**: Many thermophilic DNA polymerases, such as those derived from extremophiles, possess high fidelity, resulting in accurate replication of DNA sequences during PCR.
5. **Time-saving**: The ability to use high denaturation temperatures allows for shorter denaturation and extension times, leading to faster PCR cycling times.
Overall, the thermostability of DNA polymerases from thermophilic organisms is a key factor in the success and efficiency of PCR reactions, making them essential components of the PCR process.
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About the class
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- English
- Marathi
- Bengali
- +1
All languages in which the class is available :
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Marathi
Bengali
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Bacterial cells protect their own DNA from degradation by restriction endonucleases through a mechanism called *DNA methylation*.
Here's how it works:
1. **Restriction-modification systems**: Bacterial cells have restriction-modification (R-M) systems, which consist of two types of enzymes: restriction endonucleases and DNA methyltransferases.
2. **Restriction endonucleases**: These enzymes recognize specific DNA sequences (typically 4 to 8 base pairs long) and cleave the DNA at these sequences, effectively cutting the DNA.
3. **DNA methyltransferases**: These enzymes modify the bacterial DNA by adding a methyl group to specific bases in the DNA sequence that are targeted by the restriction endonucleases.
4. **Protection from degradation**: By methylating their own DNA, bacterial cells protect their genetic material from being recognized and cleaved by their own restriction endonucleases. The restriction endonucleases only cut unmethylated DNA, which typically includes foreign DNA such as viral DNA.
5. **Foreign DNA degradation**: When foreign DNA (such as bacteriophage DNA) enters the bacterial cell, it is often not methylated at the same sites as the bacterial DNA. This makes the foreign DNA susceptible to degradation by the restriction endonucleases.
By using this restriction-modification system, bacteria can protect their own DNA while targeting and degrading foreign DNA. This system provides a defense mechanism against viral infections and other foreign genetic material.
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Rates
Rate
- ₹2,000
Pack prices
- 5h: ₹10
- 10h: ₹20
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