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... •  Recombinant DNA is injected into a fertilized embryo in a culture dish, before it starts dividing •  As a result, all of the cells of the organism will have the genetic alteration present (whether it’s a plant or an animal). A bacterium, since it is a single cell, obviously just contains the alte ...
Document
Document

... After harvesting, plant tissue should be frozen in liquid nitrogen.* It can then be stored at –80°C for later processing. Ground tissue powder can also be stored at –80°C. Alternatively, tissue can be freeze-dried/lyophilized after harvesting to allow storage at room temperature (15–25°C). If possib ...
Lec 01 - History of Microbiology True or False 1. Robert Koch is the
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06_Isoenzymes. Enzymodiagnostics. Enzymopathy. Enzymotherapy

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... Chromosome Mutations  Down Syndrome  Chromosome 21 does not separate correctly.  They have 47 chromosomes in stead of 46.  Children with Down Syndrome develop slower, may have heart and stomach illnesses and vary greatly in their degree of inteligence. ...
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Ever since the days of Rene Descartes, the French philosopher
Ever since the days of Rene Descartes, the French philosopher

... of the palindrome sites, but between the same two bases on the opposite strands. This leaves single stranded portions at the ends. There are overhanging stretches called sticky ends on each strand (Figure 11.1). These are named so because they form hydrogen bonds with their complementary cut counter ...
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introducing single molecule real-time (smrt

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Notes on Evolution, Natural Selection, and the Evolution of Primates

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ddPCR

... a potential game changer in the fields of life science and clinical diagnostics  It is a method that uses droplet technology to divide complex samples into small, manageable sub-units  This technology is (so far) used for DNA and RNA, but should soon expand to other targets  It provides absolute ...
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Deoxyribozyme



Deoxyribozymes, also called DNA enzymes, DNAzymes, or catalytic DNA, are DNA oligonucleotides that are capable of catalyzing specific chemical reactions, similar to the action of other biological enzymes, such as proteins or ribozymes (enzymes composed of RNA).However, in contrast to the abundance of protein enzymes in biological systems and the discovery of biological ribozymes in the 1980s,there are no known naturally occurring deoxyribozymes.Deoxyribozymes should not be confused with DNA aptamers which are oligonucleotides that selectively bind a target ligand, but do not catalyze a subsequent chemical reaction.With the exception of ribozymes, nucleic acid molecules within cells primarily serve as storage of genetic information due to its ability to form complementary base pairs, which allows for high-fidelity copying and transfer of genetic information. In contrast, nucleic acid molecules are more limited in their catalytic ability, in comparison to protein enzymes, to just three types of interactions: hydrogen bonding, pi stacking, and metal-ion coordination. This is due to the limited number of functional groups of the nucleic acid monomers: while proteins are built from up to twenty different amino acids with various functional groups, nucleic acids are built from just four chemically similar nucleobases. In addition, DNA lacks the 2'-hydroxyl group found in RNA which limits the catalytic competency of deoxyribozymes even in comparison to ribozymes.In addition to the inherent inferiority of DNA catalytic activity, the apparent lack of naturally occurring deoxyribozymes may also be due to the primarily double-stranded conformation of DNA in biological systems which would limit its physical flexibility and ability to form tertiary structures, and so would drastically limit the ability of double-stranded DNA to act as a catalyst; though there are a few known instances of biological single-stranded DNA such as multicopy single-stranded DNA (msDNA), certain viral genomes, and the replication fork formed during DNA replication. Further structural differences between DNA and RNA may also play a role in the lack of biological deoxyribozymes, such as the additional methyl group of the DNA base thymidine compared to the RNA base uracil or the tendency of DNA to adopt the B-form helix while RNA tends to adopt the A-form helix. However, it has also been shown that DNA can form structures that RNA cannot, which suggests that, though there are differences in structures that each can form, neither is inherently more or less catalytic due to their possible structural motifs.
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