BISC 104 Mastering Biology Chapter 6.3

What may result from a malfunction during the S phase of interphase in the cell cycle? A. A failure of the sister chromatids to separate properly B. An inability of the cell to perform cytokinesis C. Improper cell growth for cell division D. An inability of the cell to replicate its DNA

An inability of the cell to replicate its DNA

Denali observed dividing cells under a microscope and noted cells with separated sister chromatids moving to opposite sides of the cell. Which stage of mitosis would be occurring in the observed cells? A. Anaphase B. Metaphase C. Prophase D. Telophase

Anaphase

Which step occurs during anaphase? A. DNA condenses into chromosomes. B. The nuclear envelope re-forms. C. Sister chromatids separate. D. Cytokinesis begins.

Sister chromatids separate.

What action occurs during telophase? A. The centromere splits. B. Nuclear envelopes re-form. C. Chromosomes line up across the middle of the cell. D. DNA condenses into chromosomes.

Nuclear envelopes re-form.

During which stage of mitosis do microtubules form and grow? A. Metaphase B. Prophase C. Anaphase D. Telophase

Prophase

During _____ both the contents of the nucleus and the cytoplasm are divided. A. G1 B. G2 C. the mitotic phase D. S E. mitosis

the mitotic phase

Which of these phases encompasses all of the stages of mitosis? A C D B E

E

True or false. Mitosis takes place during M phase of the cell cycle, which is longer than interphase.

False

Stages of the cell cycle Drag the labels onto the diagram to identify the stages of the cell cycle.

1. Interphase 2. Prophase 3. Metaphase 4. Anaphase 5. Telophase

A certain species of animal has six pairs of chromosomes. How many DNA molecules are present in the nuclei of these animals during G2 phase? A certain species of animal has six pairs of chromosomes. How many DNA molecules are present in the nuclei of these animals during G2 phase? A. 24 B. 6 C. 12 D. 48

24

Which cell contains uncondensed chromosomes that have been duplicated? A. A cell immediately preceding anaphase B. A cell during metaphase C. A cell during the G1 phase of interphase D. A cell during the G2 phase of interphase

A cell during the G2 phase of interphase

Which of the following checkpoints does not occur late in G1? A. A check that the cell is large enough for division B. A check that chromosome replication has been successfully completed C. A check that growth factors are present D. A check that nutrients are sufficient

A check that chromosome replication has been successfully completed

The Cell Cycle Drag the pink labels onto the pink targets to identify the two main phases of the cell cycle. Then drag the blue labels onto the blue targets to identify the key stages that occur during those phases. Blue: G2 phase G1 phase Cytokinesis S phase Mitosis Pink: Interphase Mitotic (M) phase

A. G1 phase B. S phase C. Interphase D. G2 phase E. Mitotic (M) phase F. Mitosis G. Cytokinesis

Events of Mitosis Drag the pink labels onto the pink targets to identify key events in mitosis. Then drag the blue labels onto the blue targets to identify the stages of mitosis. Pink: Mitotic spindle forming Chromosomes separating Nuclear envelope forming Sister chromatids centered Blue: Anaphase Prophase Interphase Telophase and cytokenesis Metaphase

A. Mitotic spindle forming B. Sister chromatids centered C. Chromosomes separating D. Nuclear envelope forming E. Interphase F. Prophase G. Metaphase H. Anaphase I. Telophase and cytokenesis

During _____ the cell grows and replicates both its organelles and its chromosomes. A. S B. interphase C. mitosis D. cytokinesis E. G1

interphase