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Chapter 11: Problem 102

Which of the following bacteria is not a source of restriction endonuclease? (a) Haemophilus influenzae (b) Escherichia coli (c) Agrobacterium tumefaciens (d) Bacillus amylo

Short Answer

Expert verified
Bacillus amylo is not a source of restriction endonuclease.

Step by step solution

01

Understanding Restriction Endonuclease

Understand what a restriction endonuclease is. These are enzymes that bacteria produce to protect themselves against foreign DNA, like that of viruses or other invaders. They essentially 'cut' the DNA at specific sequences, rendering it harmless. They are widely used in genetic engineering and molecular biology for cutting DNA at precise locations.
02

Continue with Research

Research individually whether each of the following bacteria produce restriction endonuclease: Haemophilus influenzae, Escherichia coli, Agrobacterium tumefaciens, and Bacillus amylo.
03

Analysing the Research

Identify which bacteria does not produce restriction endonuclease. Based on research, Haemophilus influenzae, Escherichia coli and Agrobacterium tumefaciens all produce restriction endonucleases. On the other hand, Bacillus amylo does not produce restriction endonuclease. Therefore, the correct answer is Bacillus amylo.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Bacterial DNA Protection
Bacteria have evolved amazing defenses against DNA invaders like viruses. One of the most important tools they use is restriction endonucleases. These are special enzymes that can identify and cut specific sequences within DNA molecules. By cutting DNA at these specific points, restriction endonucleases help to destroy foreign DNA, such as that from viruses, before it can harm the bacterial cell. This is key to bacterial DNA protection. Here鈥檚 how they work:
  • Restriction endonucleases scan the DNA for specific sequences known as recognition sites. These are typically 4-6 base pairs long.
  • When they find a recognition site, they bind to it and make cuts in both strands of the DNA molecule, breaking the DNA into smaller pieces.
  • This prevents the foreign DNA from integrating into the bacterium鈥檚 own DNA and making the nasty virus a part of its system.
So, these enzymes act as the bacterium's immune system, a sophisticated defense mechanism in the microscopic world.
Genetic Engineering
Restriction endonucleases are crucial tools in the field of genetic engineering. They allow scientists to make precise cuts in DNA, helping them with various applications like cloning and gene splicing. Here鈥檚 why they鈥檙e essential:
  • Scientists can use restriction endonucleases to extract genes (DNA sequences) from one organism and insert them into another. This is how we can, for example, make bacteria produce human insulin.
  • The ability to cut and paste sections of DNA has opened doors to many advances, from creating genetically modified organisms (GMOs) to developing gene therapies for diseases.
The process of genetic engineering heavily depends on these enzymes to ensure accurate changes, making them indispensable in modern laboratories.
Molecular Biology
In molecular biology, understanding how cells work at a molecular level is key, and restriction endonucleases play a fundamental role in this field. These enzymes allow researchers to dissect DNA, helping them analyze the genetic code of organisms. Applications in research:
  • They are used in DNA mapping, helping scientists locate specific genes within a DNA sequence.
  • They assist in creating recombinant DNA, which is DNA combined from different sources, enhancing our understanding of gene functions.
  • Given their precision, they make the study of genetics and cellular processes more accessible and accurate, allowing for groundbreaking discoveries in biology.
Furthermore, without restriction endonucleases, much of what we know about DNA today would remain a mystery. They are truly the workhorses of molecular biology.

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Most popular questions from this chapter

The best cloning organism for genetic engineering and biotechnology is (a) Agrobacterium (b) Pseudomonas (c) E. coli (d) Lambda phage

Which of the following is used to check the progression of restriction enzyme digestion? (a) \(\mathrm{PCR}\) (b) ROP (c) AGE (d) All

For cloning of foreign DNA it is attached with ori gene of vector which controls (a) Replication (b) Copy number of replicating DNA (c) Both (a) and (b) (d) None of these

Arrange the following process in the sequence used in rDNA technology. (1) Isolation of DNA (2) Fragmentation of DNA by RE (3) Isolation of desired DNA fragment (4) Ligation of DNA fragment into vector (5) Transferring rDNA into host (6) Culturing host cells in a medium at large scale (7) Extraction of the desired product (a) \(1,2,3,4,5,6,7\) (b) \(1,2,3,4,6,5,7\) (c) \(2,1,3,4,5,6,7\) (d) \(1,2,3,5,4,6,7\)

Molecular scissor is (a) Restriction endonuclease (b) Helicase (c) Urease (d) Peptidase
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