Becker's World of the Cell 9th Edition by Lewis Kleinsmith, Jeff Hardin, Gregory Paul Bertoni

تمرين 1

Cell Cycle Phases. Indicate whether each of the following statements is true of the G1 phase of the cell cycle, S phase, G2 phase, or M phase. A given statement may be true of any, all, or none of the phases.
(a)The amount of nuclear DNA in the cell doubles.
(b)The nuclear envelope breaks into fragments.
(c)Sister chromatids separate from each other.
(d)Cells that will never divide again are likely to be arrested in this phase.
(e)The primary cell wall of a plant cell forms.
(f)Chromosomes are present as diffuse, extended chromatin.
(g)This phase is part of interphase.
(h)Mitotic cyclin is at its lowest level.
(i)A Cdk protein is present in the cell.
(j)A cell cycle checkpoint has been identified in this phase.