Mitosis, Meiosis, Cell Cycle, And Cancer Flashcards
What cellular process(es) is/are responsible for the increase in protein content associated with the gap phases of the cell cycle?
both transcription and translation
The microtubules that form the mitotic spindle extend out from the centrosome. Where would you expect to find the plus (fast-assembling) end of a spindle microtubule?
away from the centrosome and toward the kinetochore
Synapsis is best described as
the pairing of homologous chromosomes in prophase I.
A protein that has regular up-and-down pattern of abundance during the cell cycle and that triggers progress of the cell cycle by activating kinases is called a:
cyclin
The protein p53 is an example of:
a tumor suppressor.
What characteristics do you expect to observe with a microscope if you investigate the division of mitochondria and chloroplasts in eukaryotic cells?
circular DNA attached to the plasma membrane and binary fission
In which phase of mitosis does the mitotic spindle form?
prophase
During what step in meiosis do homologous chromosomes separate?
anaphase I
At which checkpoint would a cell become arrested if a chromosome was not properly aligned in the spindle?
at a checkpoint early in the mitotic phase
Which statement regarding tumor suppressors are true?
Correct: Mutations affecting tumor suppressors can contribute to the development of cancers.
Mutations affecting tumor suppressors can contribute to the development of cancers.
Tumor suppressors act synergistically with proto-oncogenes.
Tumor suppressors promote cell division.
Tumor suppressors include platelet-derived growth factor (PDGF) and cyclins.
None of the answer options is correct.
Mutations affecting tumor suppressors can contribute to the development of cancers.
Suppose you are observing some cells with a microscope, and you see a cell that appears to be dividing. You can see that as the cell starts to pinch in half, the DNA seems to be attached to the plasma membrane via a membrane protein. On further analysis, you find that this organism’s DNA is circular – that is, it consists of a closed loop. What can you conclude about this organism and its mode of cell division?
It is a prokaryote that is dividing by binary fission.
What protein forms the contractile ring during cytokinesis in animal cells?
actin
The second meiotic division resembles mitosis because:
the daughter cells have the same number of chromosomes as the parent cell.
sister chromatids are separated during anaphase II to become the chromosomes of the daughter cells.
All of these choices are correct.
spindle microtubules attach from opposite directions to the centromere of each sister chromatid pair.
chromosomes decondense during telophase II.
All of these choices are correct.
Why would a compound that interferes with bacterial cell wall synthesis be useful for treating a bacterial infection?
It would limit growth of the bacterial population through cell division.
Why don’t plant cells use a contractile ring to divide their daughter cells?
A contractile ring can’t “pinch” a cell wall.
Would genetic recombination result if crossing over occurred between sister chromatids?
No, because sister chromatids are genetically identical or nearly identical.
At which stage of the cell cycle could you see sister chromatids with a microscope?
M
Genes that promote cancer are called:
oncogenes
Genes that participate in cell growth and division, but do not cause cancer, are:
proto-oncogenes