Archive | Cell Biology

Some of the most important types of special compounds found in cell metabolism are as follows: 1. Nucleoside Phosphates 2. Cyclic Nucleoside Monophosphates 3. Pyridine Nucleotides. Among the compounds that have special roles in cell metabolism are the nucleoside phosphates (e.g., adenosine triphosphate, ATP; adenosine diphosphate, ADP; and adenosine monophosphate, AMP), the pyridine nucleotides (e.g., nicotinamide adenine dinucleotide, NAD+; and [...]

The various phases of the growth and reproduction of cells constitute what is called the cell cycle (Fig. 2-9), a complete cycle taking place in one generation time. The principal signposts of the cell cycle are the repli­cation of the nuclear DNA and its distribution among the progeny cells. The replication of the nuclear DNA occurs in that portion of [...]

The cells that are growing in a random culture repre­sent a heterogeneous collection at various stages of the growth-division cycle or cell cycle. Some cells are dividing, some have just completed division, some are about to begin division, and so on. Any study of the progressive changes in either the chemical composi­tion of the cells or cell morphology is difficult, [...]