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