Cement
A substance that can be used to build together aggregates of sand or stone into a cohesive structure. May be a single compound or a mixture. May be hydraulic set, air set or chemical set.

Cementite
Iron carbide (Fe3C)

CentiMorgan(cM)
One percent recombination between two loci. See map distance; crossing –over unit.

Centriole
An organelle in many animal cells that appears to be involved in the formation of the spindle during mitosis. During cell division, the two centrioles move to opposite sides of the nucleus to form the ends of the spindle.

Centromere
The portion of the chromosome to which the spindle fibres attach during mitotic and meiotic division. It appears as a constriction when chromosome contract during cell division. After chromosomal duplication, which occurs at the beginning of every mitotic and meiotic division, the two  resultant chromatids are joined at the centromere

Centrosome
A specialized region of a living cell, situated next to the nucleus, where micro-tubules are assembled and broken down during cell division. The centrosome of most animal cells contains a pair of centrioles. During metaphase the centrosome separates into two regions, each containing one of the centrioles.

Cephem –type antibiotic
An antibiotic that shares the basic chemical structure of cephalosporin

Chain terminator
1.Codons which do not code for an amino acid. They signal ribosomes to terminated protein synthesis. The codons are UAA, UAG and UGA, and have been termed ochre, amber and opal, respectively. Also known as stop codons or termination codons. Often two of these codons are found together at the end of a coding sequence of RNA.
2. In the Sanger method of DNA sequencing, dideoxynucleoside triphosphates are added as chain terminators in the synthesis of a complementary DNA strand