Question

5. Describe the events that happen during each of the listed phases of the cell cycle. Which phase do cells spend the majority of their life cycle within? (3 points) a. Gap 1 DNA damace PioMaloxiMnoitstugano : suivolos ons is both b. S Phase Incomdete replication or DNA daware obson UM DNA is replicated during S phase nowd on ooted C. Gap 2 DNA damage nonoorin on your by do Olho no ob d. Gap 0 (hint: look in cancer slides) Cells that do not divide chromosome unattached to spindle usually arrest during Gl and enter Go.

Answer 1

The total time period of the cell cycle is approximately 24 here for human cell. G phase last for about 11 hours s phase about shours ₂ Phase about 4 hours in phase about 1 hour So, among all these phases, a phase is the longest. ive transcription of SRNA, MRNA , ERNA 4 a. Gap 1 phase: This phase is also known as Growth phase I. It is the longest phase of interphase and maximum increase in the cell size occurs during this phase. there occur active transcription of ORNA, me Synthesis of different types of proteins. Daughter cell in a period have a DNA Content (20), (2n 820) b. S Phase: This phase involves the replication or duplication, of DNA molecule of each chromosome. Since Histones are also synthesized during this phase. Euchromatin replication is in early part of this phase while Heterochromatin replicate later. The cell retains the original diploid (an) chromosome number but has a duplicate Set of genes & thus has double amount of DNA (4) c. Gapa phase: It is the post DNA synthesis phase during which all the metabolic activities concerning the growth of cytoplasm and its constituent coganelles along with macromolecules are performed,

40 DNA content & 2n Chromoson → During G2 phase «a cell contain (cliploid cell). d. Go phase. This is called duiescent phase. Quiescent state represent resting state. Cell in this state remains metabolically active but no longer proliferate unless stimulated to do so