Exercise 7 (Cell cycle)
Interphase
period of the cell cycle between cell divisions
Daugther cells are formed from cell cycles t/F ?
True
a cell in the stage of G-zero
ceases cell division
which of the following events occur in prophase? A) spindle disappears B) chromosomes condense C) nuclear envelopes reassemble D) sister chromatids separate
chromosomes condense
which is the correct sequence of the M ( mitotic phase)?
(PMAT) prophase , metophase, anaphase, telophase.
What happens during metaphase?
-Chromosomes align along metaphase plate of cell. -Some spindle fibers attach to kinetochores -Fibers of aster extend from centrosome to plasma membrane
What are the two major portions of the M (mitotic) phase?
-Mitosis -Cytokinesis
What happens during telophase?
-Nuclear envelopes begin to reassemble around two daughter nuclel. -Chromosomes decondense. -Spindle disappears. -Contractlie ring tightens to form the cleavage furrow, as the cytoplasm divides into two cells.
What happens during anaphase?
-Spindle fibers pull sister chromatids to opposite poles of cell. -Each pole has an identical set of genes
A karyotype is used to count centrioles and spindler fibers? T/F
False
A mature living cell that ceases cell division is in a state called ________
G0 (G-Zero)
Interphase is divided into what three phases?
G1, S, G2
What type of cell division occurs in the reproductive system to produce haploid gametes with 23 chromosomes?
Meiosis
What are the 4 recognized phases of mitosis?
Prophase , metaphase, anaphase, and telophase
sister chromatids separate to opposite poles during
Anaphase
A human diploid cell has _______ chromosomes
46
which of the following is not part of interphase? A) cytogenesis B) second gap phase C) first gap phase D) synthesis phase
A) cytogenesis
which of the following events occurs during telophase? A) sister chromatids separate B) cytogenesis C) spindle apparatus forms D)chromosomes align along equator
C) spindle apparatus forms
What happens during prophase
Chromosomes condense and become visible. -Nuclear envelope and nucleolus disperse. -Spindle apparatus forms -Centrioles migrate to opposite poles of cells.
in animal cells the indentation where the cells are pinching apart during telophase is called the
Cleavage furrow
Uncommitted cells become committed and are consequently able to carry out a particular function through a form of development called ______
Differentiation