Category: R
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Rabbit
Just as there were no rabbits in Australia until they were taken there by British settlers in 1859, there were no rabbits in England or in northern Europe till they were introduced from southern Europe in the twelfth century. Accordingly, most of the languages of northern Europe—including English, Celtic, German, Dutch, Norwegian, and Finnish—had to…
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Rpslk gene
A gene that confers to any soybean plant (possessing that gene in its DNA) resistance to as many as twenty-one strains/races of phytophthora root rot (PRR) disease.
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Rpslc gene
A gene that confers to any soybean plant (possessing that gene in its DNA) resistance to several strains/races of phytophthora root rot (PRR) disease.
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Rps6 gene
A gene that confers to any soybean plant (possessing that gene in its DNA) resistance to some strains/races of phytophthora root rot (PRR) disease.
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RNA vectors
An RNA (ribonucleic acid) vehicle for transferring genetic information from one cell to another.
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RNA polymerase
An enzyme that catalyzes the synthesis of a complementary mRNA (messenger RNA) molecule from a DNA (deoxyribonucleic acid) template in the presence of a mixture of the four ribonucleotides (ATP, UTP, GTP, and CTP). Also called transcriptase.
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Ricin
A lethal protein naturally produced in castor beans. In 1994, Robert J. Ferl and Paul C. Sehnke genetically engineered the tobacco plant to produce ricin. Attached to a pharmaceutical “guided missile” such as a monoclonal antibody or the CD4 protein, ricin is potentially useful for treatment against some tumors and has been investigated as a…
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Ribozymes
Discovered by Thomas Cech and Sidney Altman, they are RNA molecules that act as enzymes, that is, possess catalytic activity and can specifically cleave (cut) other RNA molecules. The ribozyme (RNA) molecule and the other RNA molecule come together; whereupon the ribozyme molecule cuts the other RNA molecule at a specific defined (three-base) site. Because…
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Rho factor
A protein involved in (chemically) assisting Escherichia coli RNA polymerase in the termination of transcription at certain (rho dependent) sites on the DNA molecule.
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Recombinant human
Used to denote compounds (human molecules) made through the use of recombinant DNA technology.