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Restriction Enzyme

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βˆ™ 11y ago
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βˆ™ 4mo ago

Restriction enzymes are proteins that can create DNA fragments with sticky ends by cleaving DNA at specific recognition sequences. The sticky ends refer to single-stranded overhangs that are complementary to each other, allowing for the fragments to easily anneal to each other during DNA recombination.

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Q: Which protein creates DNA fragments with sticky ends?
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What sticky ends does EcoR1 create?

EcoR1 creates sticky ends with a sequence of 5'-GAATTC-3'. This results in protruding ends with a 5' overhang on both strands of the DNA.


What seals the sticky ends of restriction fragments to make recombinant DNA?

DNA ligase seals the sticky ends of restriction fragments by catalyzing the formation of phosphodiester bonds between the nucleotides of the adjacent DNA fragments, creating recombinant DNA.


Why do sticky ends have to be complementary?

Sticky ends need to be complementary in order to form hydrogen bonds between the bases of the nucleotides, which allows the two DNA fragments to anneal together and be ligated by DNA ligase. Without complementarity, the sticky ends would not be able to hybridize and join together efficiently.


Why are sticky ends called sticky?

Sticky ends are called "sticky" because the single-stranded overhangs created by certain restriction enzymes can bind to another DNA molecule with a complementary overhang, leading to the joining of the two DNA molecules. The complementary pairing between the sticky ends creates a temporary connection, similar to how something sticky adheres to another surface.


What does the term sticky ends refer to in gene splicing?

Sticky ends are produced by cutting the DNA in a staggered manner within the recognition site producing single-stranded DNA ends. These ends have identical nucleotide sequence and are sticky because they can hydrogen-bond to complementary tails of other DNA fragments cut by the same restriction enzyme.


Fragments of DNA that have complementary sticky ends?

These fragments are called cohesive ends. They have short, single-stranded overhangs that can base pair with complementary overhangs on another DNA fragment. This allows for the fragments to be easily ligated together to form a larger DNA molecule.


What are stick ends?

Stick ends are the tips or ends of sticks or rods. They are often pointed or shaped in a way to help secure objects, provide stability, or facilitate manipulation. Stick ends can vary in design depending on their intended use.


How are the cleaved DNA fragments from two sources able to recombine?

Cleaved DNA fragments from two sources can recombine through a process called ligation, where DNA ligase enzyme reforms the phosphodiester bonds between the fragments. The overlapping ends of the fragments must be complementary for successful recombination to occur.


What is opened by a restriction enzyme?

A restriction enzyme opens up the double-stranded DNA molecule at specific recognition sites by cutting the DNA strands at those sites. This creates DNA fragments with sticky ends that can be used in molecular biology techniques like cloning and DNA sequencing.


When a restriction enzyme cuts a dna molecule the cuts are staggered so that the dna fragments have single stranded ends why is this is important in recombinant dna work?

It is important because the fragments will bond to other fragments with complementary single-stranded ends.


What is a sticky end?

A Sticky End, referring to Biology is recombinant DNA. After DNA has been cut by a restriction enzyme it has "sticky ends" or recombinant DNA at the ends.


How does the order of the nitrogenous bases determine the type of protein that will be produced?

Every 3 bases specifies either an amino acid or a terminator. The amino acid sequence creates the protein. The terminator ends the protein.