Cell Cycle and Mitosis

What is a chromatid?

A replicated chromosome

Chromatin is considered

Histones and DNA

Which of the following patterns is shown by the data?

In mutant 3 cells, more time is spent in prophase/prometaphase than in the later stages of mitosis

All of the following occur during prophase of mitosis in animal cells?

The centrioles more toward opposite poles the nucleolus can no longer be seen the nuclear envelope disappears the spindle is organized

Which of the following statements about genes is incorrect?

Under normal circumstances, each chromosome contains precisely one gene

What is the expected percent change in the DNA content of a typical eukaryotic cell as it progresses through the cell cycle from he start of the G1 phase to the G2 phase?

+100%

Starting with a fertilized egg (zygote), a series of five cell divisions would produce an early embryo with how many cells?

1 >> 2 >> 4 >> 8 >> 16 >> 32 32

If there are 20 centromeres in a cell at anaphase, how man chromosomes are there in each daughter cell following cytokinesis?

10

If there are 20 chromatids in a cell, how many centromeres are there?

10

If there ate 20 chromatids in a cell at metaphase, how many chromosomes are there in each daughter cells following cytokinesis?

10

If a cell has 8 chromosomes at metaphase of mitosis, how many chromosome will it have during anaphase?

16

A group of researchers cultured yeast cells in a nutrient-rich environment and a nutrient-poor and observed the duration of the stages of their cell cycles. The results of their study are summarized in Table 1 The cell cycle of yeast cells gown in the nutrient-poor environment is approximately what percent of the cell cycle of yeast cells gown in the nutrient-rich environment?

168

A cell containing 92 chromatids at metaphase of mitosis would, at its completion, produce two nuclei containing how many chromosomes?

46

Based on Figure 1, what percent of the time is required to compete interphase?

95%

Which of the following presents a correct interpretation of the changes in chromosome number depicted in Figure 1?

Chromosomes enter metaphase containing two chromatids attached by a centromere. During anaphase, the chromatids are separated, each becoming a chromosome. Cytokinesis distributes the chromosome into two separate cells.

The longest part of the cell cycle is:

Interphase

How do the daughter cells at the end of mitosis and cytokinesis compadre with their parent cell when it was in G1 of the cell cycle?

The daughter cells have the same number of chromosomes and the same amount of DNA

Regarding mitosis and cytokinesis, one difference between higher plants and animals is that palnts

a cell plate begins to form at telophase, whereas animals a cleavage furrow in initiated at that stage

The formation fo a cell plate is beginning across the middle of a cell and nuclei are re-forming at opposite ends of the cell. What kind of cell is this?

a plant a cell undergoing cytokinesis

What is a chromatid?

a replicated chromosome

Centromeres uncouples, sister chromatids are separated, and the two new chromosomes move to opposite poles of the cell

anaphase

Which of the following organisms does not reproduce cells by mitosis and cytokinesis?

bacterium

Where do the microtubules of the spindle originate during mitosis in both plant and animal cells

centriole

What is the name for the special region on a duplicated chromosome that holds the sister chromatids together?

centromere

A centromere is a region in which

chromatids are attached to one another

The centromere is a region in which

chromatids are attached to one another

All of the following occur during prophase of mitosis in animal cells except?

chromosomes are duplicated - interphase (S)

Which of the following organisms does reproduce cells by mitosis and cytokinesis

cow mushroom cockroach banana tree

How is the S phase of the cell cycle measured?

determining the length of time during which DNA synthesis occurred in the cells

During which phases of mitosis are chromosomes composed of two chromatids?

from G2 of interphase through metaphase

Which of the following are primarily responsible for cytokinesis in plant cells

golgi-derived vesicles

If cells in the process of dividing are subjected to colchicine, a drug that interferes with the functioning of the spindle apparatus, at which stage will mitosis?

metaphase

This is the longest of the mitotic stages

metaphase

The somatic cells derived from a single celled zygote divide by which process?

mitosis

Movement of the chromosomes during anaphase would by most affected by a drug that

prevents shortening of microtubules

Two centrosomes are arranged poles of the cell

prometaphase

Centrioles begin to move apart in animal cells

prophase

Chromosomes first become visible during __________ of mitosis

prophase

DNA Replication can be best described as

semiconservative

All of the following occur during mitosis expect the

synthesis of DNA

Which of the following best describes how the amount of DNA in the cell changes during M phase?

the amount of DNA is halved as the cell divides into two daughter cells

All of the following occur during mitosis

the condensing of chromosomes uncoupling of chromatids at the centromere formation of a spindle disappearance fo the nucleolus

Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, taxol disrupts microtubule formation by binding to microtubules and accelerating their assembly from the protein precursor, tubular. Surprisingly, this stops mitosis. Specifically taxol must affect

the fibers fo the mitotic spindle