I. The Cell Cycle Prior to division, the eukaryotic cell must undergo an extended period of preparation, called the interphase. The interphase represents the interval between two consecutive cell divisions. During interphase, the cell synthesizes all the materials that are needed for division to occur, including all the DNA molecules and associated proteins that make up all the chromosomes in the cell. The chromosomes are so named since they are readily stained to become "colored bodies", as shown in Figure 9.1. One or more darkly staining structures inside the nucleus, called the nucleoli, are readily visible in interphase, erti ta-savibeido primes.l What is the function of the nucleoli? • produces ubomor ribsences podig Bwist Jert ou make protein to ins bris nisl di notestub or During M phase, the cell undergoes mitosis to divide its nucleus in two, and toward the end of mitosis, it undergoes cytokinesis, to divide its cytoplasm in two. yo pawl M phase is composed of DIVISIVO noe elit krywhenesis and afloseness mainspo silonexion a quaexem too olevizolong rosa ("ount" um eis echt to vinojem, tasy art belle signie six arginsgro The interphase and the M phase together comprise the cell cycle. The duration of the cell cycle varies greatly among different eukaryotic organisms and among different types of cells. In humans, it is typically 24 hours, with interphase taking up approximately 90% of the cell cello cycle. bad agu A cell entering interphase carries one DNA molecule on each of its multiple, linear chromosomes. At the end of interphase, the cell carries two DNA molecules on each chromosome (Figure 9.1). The two DNA molecules are identical in the genetic information that they carry. Two such DNA molecules located on the same chromosome, along with their associated proteins, are called sister chromatids. pricgrobnu to siceno e feril mainopic oitoviaxine flabs ne ellso to asqyt betimil ed pleanbloyed to 290 to en el aisclM blog entri esime sw fbirtw, alacion spisite bate adm 150 in cotabny nap all before interphase Figure 9.1 Each eukaryotic chromosome van ellso noanthis eu (60 209001g xaigmoo syd os ob nolaivib dvorito srl (aupbun aril to nole eril) Gabios del - centro mere. We sinondine prinud uojo apanish susait srovidma aril bruów editiegen art etrove bris sess01g erT arbe bas rada onl after interphase bem loninco viemetog has two sister chromatids at the end of interphase. Isra too s niliw enolibeneini