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bio chapter 10
cell cycle
Question | Answer |
---|---|
what part of a chromosome directs the production of rna and protiens | gene segment |
where do cells spend the most time in the cell cycle | interphase |
how many checkpoints does the cell cycle have | three |
name the three checkpoints o the cell cycle | G1 G2 mitosis |
what are the three reasons cells divide | cell size cell matinence growth and repair |
what is the purpouse/function of a centromere | to hold to sister chromatids together until ready to divide |
what stage happens before G1 | cytokinesis |
what is a chromatid | strands of duplicated gene |
correct sequence of cell cycle | G1, S, G2, Mitosis, Cytokinisis |
where does dna replication occur | S phase |
how many steps are in mitosis | Four |
name the steps of mitosis | prophase metaphase anaphase telophase |
what are the first three phases of cell cycle known as | interphase |
what phase are chromosomes lined up in the middle of the cell | metaphase |
what phase does a nuclear membrane form around dna | telophase |
what phase does the nuclear membrane disappear | prophase |
what phase do the sister chromosomes separate and are pulled to opposite poles | anaphase |
what is cell division controlled by in eukaryote cells | proteins signals from surrounds cells and organs environmental changes |
what happens to normal cells in the cell cycle that causes them to be cancer cells | cells ignore checkpoints |
when then cell is about to divide dna is packed into coiled structures called | chromosomes |
sequence of events that occurs from one cell division to the next | cell cycle |
what is happening in G1 | cell grows and builds organelles |
what happens in the S phase | dna is copied |
what happens in G2 | cell grows and prepares to divide |
what happens to the nucleus in mitosis | forms daughter nuclei |
how many daughter cells are made in mitosis | Two |
what happens in cytokinesis | division of cytoplasm |