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Home >> Genetics Dictionary >> Prosimian Pupae - Pyrimidine
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Prosimian
One of the group of primates that includes lemurs and lorises; the other two primate groups are tarsoids and anthropoids.
Protease
Any enzyme that digests protein.
Pseudogene
A sequence of DNA similar to a gene but nonfunctional; probably the remnant of a once-functional gene that accumulated mutations.
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2. An inactive gene within a gene family derived by mutation of an ancestral active gene.
3. A sequence of nucleotides in the DNA that resembles a gene but is nonfunctional for some reason.
Protein
A large molecule composed of one or more chains of amino acids in a specific order; the order is determined by the base sequence of nucleotides in the gene that codes for the protein. Proteins are required for the structure, function, and regulation of the body's cells, tissues, and organs; and each protein has unique functions. Examples are hormones, enzymes, and antibodies.
2. A large complex molecule made up of one or more chains of amino acids. Proteins perform a wide variety of activities in the cell.
3. A molecule composed of one or more polypeptides. Prototroph An organsim (usually a microorganism) that is capable of growing on minimal medium. Wild-type strais are usually regarded as prototrophs.
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4. A molecule made up of a sequence of amino acids. Many of the important molecules in a living thing for example, all enzymes are proteins.
5. A molecule composed of one or more polypeptide chains, each composed of a linear chain, of amino acids covalently linked by peptide bonds
Proteome
Proteins expressed by a cell or organ at a particular time and under specific conditions.
Punnett square
The checkerboard method commonly used to determine the types of zygotes produced by a fusion of gametes from the parents; the results allow the computation of genotypic and phenotypic ratios.
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Pupa (plural pupae)
The third stage of development in the life cycle of some insects, including flies, butterflies (in which it is the chrysalis), ants, bees, and beetles. During the pupal stage locomotion and feeding cease and metamorphosis from the larva to the adult form takes place. The adult emerges by cutting or digesting the pupal case after a few days or several months.
Proteomics
The study of the full set of proteins encoded by a genome.
Prototroph
An organism that is capable of growing on a defined minimal medium; often this is usually regarded as the wild type strain.
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P site
Holds the tRNA molecule that is attached to the growing end of the nascent polypeptide.
PUBS
Percutaneous umbilical blood sampling which obtains blood from the umbilical vein of the fetus to get a rapid chromosome analysis or a specific blood analysis.
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Protozoa
A group of unicellular, usually microscopic, organisms now classified in various phyla of the kingdom Protoctista. They were formerly regarded either as a phylum of simple animals or as members of the kingdom Protista. Most feed on decomposing dead organic matter, but some are parasites, including the agents causing malaria (Plasmodium) and sleeping sickness (Trypanosoma), and a few contain chlorophyll and carry out photosynthesis, like plants.
Purine
A nitrogen-containing, double-ring, basic compound that occurs in nucleic acids. The purines in DNA and RNA are adenine and guanine.
2. A kind of base in the DNA; adenine (A) and guanine (G) are purines.
Pyloric stenosis
A narrowing of the pylorus of the stomach causing projectile vomiting. This can be life threatening if not surgically corrected as the infant cannot take in nourishment until the defect is repaired.
Pyrimidine
A nitrogen-containing, single-ring, basic compound that occurs in nucleic acids. The pyrimidines in DNA are cytosine and thymine; in RNA, cytosine and uracil.
2. A kind of base. In DNA, cytosine (C) and thymine (T) are pyrimidines. In RNA, cytosine (C) and uracil (U) are pyrimidines.
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