BioScience Dictionary

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Ot.

Found RNA 413 times.

Displaying results 1 to 10.

1. 16S rRNA
A large polynucleotide (about 1500 bases) which functions as a part of the small subunit of the ribosome of prokaryote s and from whose sequence evolutionary information can be obtained; the eukaryotic counterpart is 18S rrna.

2. 1-thiouridine
A modified pyrimidine base formed by the replacement of an oxygen atom by a sulfur atom and is found only in trna s.

3. 3'-azido-3'-deoxythymidine (AZT)
An antibiotic used to treat infection by HIV (the AIDS virus ). The drug works by blocking replication of the HIV genetic material (in this case it is composed of rna rather than DNA ) by preventing the viral rna from inserting into the host DNA.

4. 7-methyl guanosine
A guanosine ribonucleotide (has the nitrogenous base guanine attached to the sugar ribose ) which has a methyl group attached to the 7th ring atom of the guanine (a nitrogen atom). These are found at the capped 5'-ends of eukaryotic mrna .

5. Aardvark (Orycteropus afer)
A nocturnal, burrowing southern African mammal, Orycteropus afer, which is characterized by a long snout and tongue for eating ants and termites. The name "aardvark" is Afrikaans for "earth pig."

6. Abrin (agglutinin, toxalbumin)
A highly poisonous protein found in the seeds of Abrus precatorius, the rosary pea. Abrin is toxic because it inhibits protein synthesis, causing symptoms such as internal bleeding, intestinal upset, and the irritation of mucous membranes. It was formerly used to treat some chronic eye disorders and it is currently being researched as a potential chemotherapy drug.

7. Absorption
The process by which the products of digestion are transferred into the body's internal environment, enabling them to reach the cells.

8. Acoelomate
A triploblastic organism which does not have an internal body cavity other than the gut. The area between the gut and the organism's outer body wall is completely filled with tissue derived from the mesoderm . The term is used to classify multicellular animals by developmental pattern.

9. Acridine orange
3,6-bis(dimethylamino)acridinium chloride. A toxic, fluorescing dye that stains DNA and rna and is typically used to identify cancerous tumor cells. When it binds to double-stranded DNA , it fluoresces green; when it binds with the phosphate groups of single-stranded DNA or rna , it fluoresces orange. The chemical also causes frameshift mutations.

10. Acromegaly
Acromegaly is a hormonal disorder in which there is excessive secretion of the growth hormone resulting in enlargement of hands, feet, face, tongue, jaws and internal organs. The cause is usually a benign pituitary adenoma .

View web definitions »

Learn more about RNA »