Determine whether each statement below is true or faslse: A centrosome consists of 9 triplets of centrioloes oriented at 90 degree angles. [Select] > By the end of G1 phase, a cell would be expected to have a total of 4 centrioles. [Select] > Centrioles consist of a total of 27 microtubules organized into a hollow cylinder. [Select]

Determine whether each statement below is true or faslse: A centrosome consists of 9 triplets of centrioloes oriented at 90 degree angles. [Select] > By the end of G1 phase, a cell would be expected to have a total of 4 centrioles. [Select] > Centrioles consist of a total of 27 microtubules organized into a hollow cylinder. [Select]

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter3: Cell Structure And Function

Section: Chapter Questions

Problem 17CTQ: In the context of cell biology, what do we mean by form follows function? What are a least two...

See similar textbooks

Similar questions

In all cells, microtubules nucleate from the centrosome and then become stabilized or collapse. What feature of microtubules contributes to this phenomenon?
(a) What is the centrosome? (b) Cytoskeletal elements play important roles in cell division. The mitotic spindle apparatus is made up of and pulls sister chromatids apart, whereas the contractile ring is made up of required for the separation of daughter cells at the end of the mitotic phase of the cell cycle. Question 8 Diagrammatically show metaphase and telophase of mitosis using a cell that is 2n=2 which has one metacentric chromosome and one telocentric chromosome.
Microtubules within a cell appear to be arranged in specific arrays. What cellular structure is responsible for determining the arrangement of microtubules within a cell? How many of these structures are found in a typical cell? Describe how such structures serve to nucleate microtubule assembly.
Suppose cells in an experiment had been labeled with green fluorescent tubulin. At the onset of Anaphase B, you use your laser to bleach a stripe across all of the microtubules on one side of the spindle as shown by the dashed line. This does not hurt the function of the microtubules in any way, but the bleached, nonfluorescent subunits in the microtubules now serve to mark a fixed location relative to the (+) and (-) ends. pl. membr. spindle A. Label one of each of the following: kinetochore MT, astral MT, polar MT. Indicate (+) and (-) ends. B. As the cell progresses through anaphase B, do the bleached spots get closer to, further from, or stay the same distance from the spindle pole they are embedded in? Why? Do they get closer to, further from, or stay the same distance from the plasma membrane? Why?
The lifetime of a microtubule in a mammalian cell, between its formation by polymerization and its spontaneous disappearance by depolymerization, varies with the stage of the cell cycle. For an actively proliferating cell, the average lifetime is 5 minutes in interphase and 15 seconds in mitosis. If the average length of a microtubule in interphase is 20 μm, how long will it be during mitosis, assuming that the rates of microtubule elongation due to the addition of tubulin subunits in the two phases are the same?
These types of proteins are responsible for all the following events during cell division: movement of "chromosomes" to poles, sliding of non-kinetochore microtubules pushing the two ends of the cell apart, and also the production of the cleavage furrow during cytokinesis. They are called _ _ (two words)
The mitotic spindle is often described as a microtubule based cellular machine. The microtubules that constitute the mitotic spindle can be classified into three distinct types. What are the three types of spindle microtubules, and what is the function of each?
Taxol is a drug that inhibits microtubule dynamics and is often used for cancer chemotherapy because it preferentially affects dividing cells. What microtubule-based structure is likely disrupted by Taxol so that it specifically affects proliferating cells?
Which of the following statements about the function of the centrosome is FALSE? Microtubules emanating from the centrosome have alternating polarity such that some have their plus end attached to the centrosome while others have their minus end attached. Centrosomes contain y-tubulin ring complexes important for microtubule nucleation. Centrosomes typically contain a pair of centrioles made of short microtubules. Centrosomes are the major microtubule-organizing center in animal cells. Two centrosomes form the mitotic spindle during cell division.
Identify the false statement about centrioles. (a) They start to duplicate in G1. (b) They lie in the centrosome. (c) They are made of microtubules. (d) They are membrane-walled barrels lying parallel to each other.
Which of the following diagrams correctly depicts the orientation of microtubules during metaphase of mitosis? A B C OA I (-) (+) (+) (+) (+) (+) (+) (+) (+)50 (+) == (-) XX [(+) (-) E (-) J ++) (+) - (+) (-) (+) 11 15+ E (+) (-) 50 at &&05 (-) 50) (+) (-) (-) (+) (-) D E (+) (+) (+) D (-) St (+) coff (+) (-) (+) (+) (-) (-) (+) (-) (-) affere XXX (-)- (-) ++) (+) (-) (-) (-) (-) K
What is interphase? Explain it diagramatically.