Biology Exploring Life - Chapter 9 Assesment

When a single-celled organism produces offspring by splitting into two identical new cells, the process is an example of

The difference between a cell in G1 and G2 phases of the cell cycle is that

A sign that a eukaryotic cell has begun mitosis is

Which of the following statements about the cell cycle is false?

A cell spends up to 90 percent of it's time in interphase

Both prokaryotic and eukaryotic cells follow similar cell cycles

The speed of cell division varies withthe cell role within the organism

Some eukaryotic cells do not follow the cell cycle

Irregularities in the cell cycle can lead to disease

In interphase, after a cell duplicates it's DNA, each chromosome consists of

How does cytokinesis differ in plant cells and animal cells?

In animal cells, cytokinesis occurs in telophase; in plant cells, cytokinesis occurs in interphase

In animal cells, the plasma membrane pinches inward; in plant cells, a disl of cell wall material grows outward

In animals, the result is two diploid cells; in plants, two haploid cells result

Cytokinesis completes cell division in animals but not in plants

All of the above

The uncontrolled cell division of cancer cells is dangerous because

The cells can displace normal tissues

The cells can spread into surrounding tissues

The cells can migrate to other parts of the body

Cancer cells do not function as noraml tissue cells

All of the above

Both radiation and chemotherapy can be effective treatments for cancer because

They can stop cancer cells from dividing

They can remove tumors

They have few side effects

They cut off the blood supply to tumors

They only work on old, mature cells

How do homologous chromosomes and sister chromatids differ?

Homologous chromosomes are formed in mitosis, while sister chromatids are formed in meiosis

Homologous chromosomes are genetically identical, while the sister chromatids may carry different versions of their genes

Homologous chromosomes may carry different versions of their genes, while sister chromatids are genetically identical

Sister chromatids carry twice as much DNA as homologous chromosomes

During meiosis I sister chromtids seperate, while during meiosis II homologous chromosomes seperate

Which of the following statements about karyotypes is false?

A karyotype visually displays all of an individual's chromosomes

A karyotype shows how chromosomes in homologous pairs are always identical to their mates

A human karyotype contains 46 chromosomes

Human karyotypes contain 23 homologous pairs of chromosomes

In humans a female karyotype is different than a male karyotype

The two processes that ensure a contstant number of chromosomes from generation to generation in sexually reproducing species are

Which of the following statements describes a major difference between mitosis and meiosis?

Meiosis produce four haploid cells, while mitosis produces two diploid cells

The offspring cells of mitosis are not genetically identical, while those of meiosis are.

Mitosis occurs after interphase, while meiosis occurs during interphase

Mitosis occurs in plant cells, while meiosis is unique to animal cells

Mitosis reduces the number of chromosomes, while meiosis maintains the same number of chromosomes

Meiosis II is similar to mitosis, except that

Instead of starting with a diploid cell, meiosis II starts with a haplpoid cell

In meiosis II, homologous chromosomes pair up

Centromeres are critical to mitosis, but absent in meiosis II

All of the above

None of the above

Which process generally plays a larger role in an organism's day-to-day survival, and why?

Meiosis, because it involves two nuclear divisions

Mitosis, because it results in diploid daughter cells

Meiosis, because it results in haploid daughter cells

Mitosis, because it is involved in an organism's growth and repair

Meiosis, because it allows for sexual reproduction

Genetic variation among offspring is ensured by the random assortment of homologous chromosomes in meiosis I and

Crossing over occurs

The daughter cells of mitosis differ from those of meiosis in that

During mitosis, the movement of chromosomes is guided by

Biology Exploring Life - Chapter 9 Assesment

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