Week 6 - Mitosis/Meiosis

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

FALSE Mitosis does indeed take place during M phase, but M phase is shorter than interphase; cells spend most of their time in interphase.

What is the correct order of events in the cell cycle?

G1, S, G2, mitosis, cytokinesis

In which phase of the cell cycle are cells most often found?

Interphase

What is the region in the middle of a replicated chromosome that connects sister chromatids?

centromere

During which phase of the cell cycle does the cytoplasm divide?

cytokinesis

During which process would a cell plate form?

cytokinesis in a plant cell

During which phase of mitosis are the replicated chromosome aligned in the middle of the cell?

metaphase

Which type of cell division produces daughter cells that are identical to the original cell?

mitosis in animals

During which part of mitosis does the nuclear envelope break down?

prophase

All organisms must be able to ______________

reproduce

Genes

section of DNA with instructions for building all cell proteins

Reproduction requires a _______________ How does this happen?

transmittal of DNA to offspring Chromosomes are duplicated

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?

24 DNA replication is completed during S phase, which occurs prior to G2 phase. Since each chromosome (12) is replicated, there are 24 DNA molecules in the nucleus during G2 phase.

DNA caries genes: True or False

True

Which cell contains uncondensed chromosomes that have been duplicated?

a cell during the G2 phase of interphase DNA is duplicated during the S phase, following the G1 phase of interphase. The chromosomes do not become condensed until prophase. See Section 6.3.

Which of the following checkpoints does not occur late in G1?

a check that chromosome replication has been successfully completed Chromosome replication does not occur until after G1; this checkpoint is a G2 checkpoint.

What may result from a malfunction during the S stage of interphase in the cell cycle?

an inability of the cell to replicate its DNA.

During which phase of mitosis do sister chromatids separate to opposite poles of the cell?

anaphase

What type of reproduction includes the binary fission used by single-celled bacteria to produce genetically identical daughter cells?

asexual reproduction

Genes must be copied ____________ cells divide

before