Chapter 12 HW

During which phase(s) of mitosis do we find chromosomes composed of two chromatids (duplicated chromosome)? from G1 of interphase through metaphase from anaphase through telophase from G2 of interphase through metaphase from interphase through anaphase from metaphase through telophase

from G2 of interphase through metaphase

Chromosomes are aligned along the cell's equator during prometaphase. anaphase. metaphase. interphase. prophase.

metaphase

Which of the following does not occur during mitosis? packaging of the chromosomes replication of the DNA spindle formation separation of the centrosomes separation of sister chromatids

replication of the DNA

Which of the following organisms does not use mitosis to make another cell? mushroom banana tree bacterium cow cockroach

Bacterium

Binary fission uses a spindle (network of microtubules made by centrosomes) for separation of daughter chromosomes, just as in mitosis. True False

False

DNA replication occurs in the last stage of interphase just before mitosis. True False

False

The haploid (n) number of chromosomes is found in nearly all body cells of humans and most other animals. True False

False

A particular cell has not replicated its DNA yet. The cell in question is most likely in G2 G1 metaphase. anaphase. prophase.

G1

How do the daughter cells at the end of mitosis compare 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. The daughter cells have half the number of chromosomes and half the amount of DNA. The daughter cells have the same number of chromosomes and twice the amount of DNA. The daughter cells have half the amount of cytoplasm and half the amount of DNA. The daughter cells have the same number of chromosomes and half the amount of DNA.

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

A microtubule organizing center (centrosome) is located at each pole of the dividing cell in both plants and animals. True False

True

Brain cells (neurons) are constantly in G0 phase of interphase. This means that they are not able to regenerate after injury. True False

True

Cell division in eukaryotes involves separate processes called mitosis and cytokinesis. True False

True

Contact inhibition stops normal cells from dividing when they come in contact with neighboring cells, but this is not functional in cancer cells True False

True

Sister chromatids each have their own kinetochore. True False

True

One difference between a cancer cell and a normal cell is that cancer cells continue to divide even beyond their boundaries the cell cycle of the cancer cell is arrested at the S phase. cancer cells cannot function properly because they suffer from density-dependent inhibition. cancer cells are always in the M phase of the cell cycle. the cancer cell is unable to synthesize DNA.

cancer cells continue to divide even beyond their boundaries

In some organisms, mitosis occurs without cytokinesis occurring. This will result in cells with more than one nucleus. cell cycles lacking an S phase. cells lacking an anaphase cells that are unusually small. cells lacking nuclei.

cells with more than one nucleus.

Where do the microtubules of the spindle originate during mitosis in both plant and animal cells? chromatid centromere kinetochore centrosome nucleus

centrosome

One of the major differences in the cell division of prokaryotic cells compared to eukaryotic cells is that cytokinesis does not occur in prokaryotic cells. genes are not replicated on chromosomes in prokaryotic cells. the duplicated chromosomes are attached to the nuclear membrane in prokaryotic cells and are separated from each other as the membrane grows. the chromosomes do not separated along a mitotic spindle in prokaryotic cells. the chromosome number is reduced by half in eukaryotic cells but not in prokaryotic cells.

the chromosomes do not separated along a mitotic spindle in prokaryotic cells.

In animal cells, cytokinesis involves the separation of sister chromatids. the contraction of the contractile ring of microfilaments. depolymerization of kinetochore microtubules. a protein kinase that phosphorylates other enzymes. sliding of nonkinetochore microtubules past each other.

the contraction of the contractile ring of microfilaments.

All of the following occur during mitosis except the formation of a spindle. the condensing of chromosomes. the disappearance of the nucleolus. the uncoupling of chromatids at the centromere. the synthesis of DNA.

the synthesis of DNA.