Phosphorylation of nuclear lamins regulates their assembly and disassembly during mitosis. You add a drug to cells undergoing mitosis that inhibits the activity of an enzyme that dephosphorylates nuclear lamins
What do you predict will happen to these cells? Why?
Cells should become arrested in mitosis. Normally, the lamins are phosphorylated during mitosis, causing disassembly of the nuclear envelope. At the end of mitosis, the nuclear lamins are dephosphorylated, causing the lamins to reassemble. Inhibition of this last step should therefore prevent the nuclear lamins from reassembling after mitosis.
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Faults are regions where lithospheric plates are moving toward one another
Indicate whether the statement is true or false
Irises and other ____ plants flower only when the hours of darkness fall below a critical value, typically in summer
a. short-day b. long-day c. annual d. biennial e. perennial
How must spindle microtubules attach to chromosomes during prometaphase of meiosis I?
a. Microtubules attach at the centrosomes. b. Microtubules attach to the chiasma. c. Spindle microtubules from one pole attach to one kinetochore, and spindle microtubules from the other pole attach to the other kinetochore in a pair of sister chromatids, just like in mitosis. d. Spindle microtubules from one pole must attach to both kinetochores in a pair of sister chromatids. e. Microtubules attach using their minus (slow assembling) ends.
You prepare a human karyotype. Upon analysis, you find 22 pairs of chromosomes that are each of approximately equal length and also a single pair that has one chromosome longer than the other. What can you conclude from this information?
A) The organism that this cell came from is likely a female. B) The organism that this cell came from is likely a male. C) The organism that this cell came from has a genetic disease. D) This cell is likely haploid.