Explain whether the statement, "Chromosomes are positioned on the metaphase plate by equal and opposite forces that pull them toward the two poles of the spindle", is true or false.

In mitosis, what chromatid combination(s) will be present during metaphase? What combination(s) will be present at each pole at the completion of anaphase?

List in each blank the description of events associated with each stage of mitosis in addition to the preparatory stage Interphase. Some events and structures occur only in plant cells and some in animal cells. Mark these events in the list with an asterisk.

The same chromosome can look very different depending on when in meiosis it is observed.  Explain fully why this is so and also why the chromosome is less condensed during some parts of the cell cycle?  How many DNA molecules does each chromosome contain at the beginning of Prophase I?  Use the following terms in your explanation: chromatin, histone, chromatid, centromere.

Match the stage of mitosis with the following key events.

Define the following terms: a. chromosome b. chromatin

1) Examine the picture of an onion root tip with cells in various stages of the cell cycle. A student claims that interphase is the longest stage of the cell cycle. Another student claims that mitosis is the longest stage. Using evidence from the photo, determine which student is correct and why.   A) Mitosis is the longest stage because anaphase requires more time to separate chromatids.     B) Interphase is the longest stage because chromosomes are visible in the majority of the cells.     C) Mitosis is the longest stage because the majority of the cells in the photo are replicating their DNA.     D) Interphase is the longest stage because the majority of the cells in the photo have uncondensed chromatin and are not dividing.   Not Graded

Explain why we can say that M-phase of the cell-cycle is triggered by a positive feedback loop.              a) What would the consequences be if cohesins were working normally but condensins were not? and b) what stage of the cell cycle would this cause problems in?             Why is it important for the centrosome to duplicate during G1-G2 (interphase) before M phase?           The kinetochores serve as a link between the sister chromatids and the microtubules attached to the mitotic spindle. a) How are microtubules still able to exhibit dynamic instability after they are bound to the sister chromatids and b) why is this important to mitosis?             As the name suggests, the Anaphase-promoting-complex (APC), promotes the 4th phase of mitosis by separating the sister chromatids so they can travel to separate poles of the cell, and prevents them from being re-zipped together. Describe how APC does these two things (Hint: one involves M-cyclin and the other involves…

What is the function of mitotic spindle?

Cell growth and cell division use a checkpoint at a certain stage of the process. What would be he consequence(s) of a defective checkpoint if the spindle fiber fails to attach to the sister chromatid during meiosis?