Campbell Biology Chapter 12 Test Bank

Campbell Biology Chapter 12 Test Bank 1) Eukaryotic chromosomes are composed of which of the following macromolecules? - correct answearsC) DNA and proteins 1) Through a microscope, you can see a cell plate beginning to develop across the middle of a cell and nuclei forming on either side of the cell plate. This cell is most likely - correct answearsB) a plant cell in the process of cytokinesis. 2) Starting with a fertilized egg (zygote), a series of six cell divisions would produce an early embryo with how many cells? - correct answearsD) 64 2) Vinblastine is a standard chemotherapeutic drug used to treat cancer. Because it interferes with the assembly of microtubules, its effectiveness must be related to - correct answearsA) disruption of mitotic spindle formation. 3) In a diploid cell with 5 chromosome pairs (2n = 10), how many centromeres will be found in a nucleus at G2 of the cell division cycle? - correct answearsB) 10 3) One difference between cancer cells and normal cells is that cancer cells - correct answearsC) continue to divide even when they are tightly packed together. 4) Scientists isolate cells in various phases of the cell cycle. They isolate a group of cells that have 1 1/2 times more DNA than G1 phase cells. What is the most likely part of the cell cycle from which these cells were isolated? - correct answearsD) in the S phase of the cell cycle 4) The decline of MPF activity at the end of mitosis is due to - correct answearsC) the degradation of cyclin. 5) G1 is associated with which of the following cellular events? - correct answearsA) normal growth and cell function 5) In the cells of some organisms, mitosis occurs without cytokinesis. This will result in - correct answearsA) cells with more than one nucleus. 6) What is the name of the microtubule-organizing center found in animal cells as an identifiable structure present during all phases of the cell cycle? - correct answearsB) centrosom