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Biology
Chapter 9 test
| Question | Answer |
|---|---|
| the cell cycle is divided into interphase and mitosis | false |
| during prophase in an onion root tip cell, centrioles migrate to the pole of the cell | false |
| in plant cell, cytokinesis happens with a furrow that pinches the cell | false |
| stem cells are only one type: embryonic | false |
| by the end of prophase, each of the following has occured except | D:lining up chromosomes in the cell |
| the chromosomes shown are in which stage of mitosis | C anaphase |
| which of the cells depicted in the line graph are most likely cancerous? | A |
| which of the following does not occur as a cell grows larger and larger in size? | D. diffusion across the cell membrane is impaired |
| a cell that undergoes repeated mitosis without cytokinesis would have | A many daughter cells |
| why is it important for the chromosomes to condense during mitosis? | A. to facilitate DNA replication |
| the typical growth period of a cell occurs during which stage of the cell cycle? | A. Gap 1 |
| some cancers have a genetic component to them, if a parent has cancer the children are more likely than the average population to develop the cancer. why might this be | D. cancers are often recessive traits and require alleles from both parents |
| a stem cell has potential medical uses because it | B. is not specialized in structure and function |
| why is the synthesis stage called this | because DNA synthesis is taking place |
| which of these has occurred by the end of prophase? | B. the spindle is beginning to form |
| figure 9-4 illustrates which stage of mitosis | B. metaphase |
| how is the alignment of chromosomes shown in 9-4 on the equestorial plate of the cell maintained? | D. the chromosomes are attracted to eachother and meet there |
| which of the following occurs in telophase? | c. chromosomes move to opposite poles |
| a cell has 12 chromosomes how many chromosomes will each daughter cell have? | 12 |
| the cell cycle is regulated by | cyclins |
| what is cancer caused by? | c mutation |
| what is the role of cyclin-dependent kinasis in the cell cycle? | C. they provide the energy for the actions of the spindle fibers |
| the cell in figure 9-6 is undergoing mitosis. which stages of mitosis will follow this one? | B. metaphase |
| DNA replication occurs during? | B metaphase |
| which of the phases of mitosis has the shortest duration? | B. cytokinesis |
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random789