PSYC12H3 Lecture Notes - Lecture 18: Cell Membrane, Actomyosin Ring, Inside Out Music

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Published on 19 Apr 2013
School
UTSC
Department
Psychology
Course
PSYC12H3
Lecture 18 Quiz
Question 1 - 549
Which one of the following is correct about Cytokinesis:
Cytokinesis leads to segregation of duplicated chromosomes into daughter nuclei
The first hint of cytokinesis in animal cells apears in metaphase.
A cell plate a formed during cytokinesis of an animal cell
The mechanism of cytokinesis in animal cells is in an opposite direction of that of plant cells
Both A and D are correct
Question 2 - 534
which of the following events DOES NOT promote the metaphase-anaphase transition? FIGURE 14.26 (b)
The APC binds Cdc20 and ubiquinates securin.
An active protease called separase is released .
Cdh1 binds APC ubiquinates anaphase inhibitor which is called securin
Separase cleaves cohesins that hold sister chromatids together.
anaphase begins when sister chromatids separate.
Question 3 - 531
Which of the following statements is/are incorrect?
During anaphase, sister chromatids lose affinity for each other
During metaphase, chromosomes move away from poles via kinesin activity
During prometaphase, chromosomes move toward poles via dynein activity.
During cytokinesis, microfilaments are involved in the formation of the contractile ring
None of the above are incorrect.
Question 4 - 536
Animal cells and plant cells go through cytokinesis through different mechanisms. Which of the following is/are true
regarding cell cytokinesis?
Plant cells conduct cytokinesis through an inside to outside mechanism
Plant cells conduct cytokinesis through an outside to inside mechanism
Animal cells conduct cytokinesis through an outside to inside mechanism
Animal and plant cells conduct cytokinesis through an inside to outside mechanism
Both A and C
Question 5 - 513
Which of the following are false concerning the phragmoplast?
A phragmoplast uses an inside-out mechanism to form the cell plate
It involves the microtubule association to vesicles
It occurs during in late cytokinesis
It only appears in plant cells
All of the above are true
Which statement(s) below regarding the Metaphase Spindles of an Animals cell are true? (reference: slides 3-4 on lecture
18, and pages 578 + 586)
Astral Microtubules help position the spindle apparatus in the cell and may help determine the plane of
cytokinesis.
Kinetochore microtubules exert a pulling force on the kinetochores of the chromosome, which results in the
chromosomes being maintained at the equatorial plane.
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Kinesins use polar microtubules for the initial movement of spindle poles away each other in prometaphase.
All of the above.
A and B only
Question 2 - 509
Which of the following statement is true?
Levels of APCCdh1 are high from Anaphase to G1.
Levels of APCCdh1 are low from Anaphase to G1.
Level of APCCdc20 is high during the S and G2 phases of the cell cycle.
Level of APCCdh1 is high during the S and G2 phases of the cell cycle.
Both A and C
Question 3 - 514
Which of the following occurs in anaphase B movement?
The sister chromatids move towards the poles
The poles separate with a dynein-like motor acting on the polar microtubules
The chromosomes move toward the pole due to dynein-like motors
The dynein-like motor pulls the spindle poles to the cell cortex
None of these
Question 4 - 535
which of the following options are correct?
astral microtubules position mitotic spindle and determine plane of cytokinesis.
polar microtubules associates with pole separation.
kinetochore microtubles divides the cell's cytoplasm in to two packages.
a and b are correct.
b and c are correct.
Question 1 - 504
Which of the following is an incorrect statement about anaphase?
Opposite spindle poles separate in Anaphase B via the activity of a kinesin-like motor
A kinesin-like motor is associated with the cell cortex and acts to pull spindle poles apart by acting on polar
microtubules
Sister chromatids lose affinity for one another
Sister chromatids move towards opposite poles in Anaphase A due to the activity of a dynein-like motor
Different molecular motors are required as well as the destruction of some regulatory molecules
B: Incorrect. It is a DYNEIN-like motor which associates with the cell cortex, not a kinesin-like motor. Also, astral
microtubules are operated on, not polar. See figure 14-33 in the textbook for additional clarification.
Question 2 - 531
Which of the following statements is/are incorrect?
During anaphase, sister chromatids lose affinity for each other
During metaphase, chromosomes move away from poles via kinesin activity
During prometaphase, chromosomes move toward poles via dynein activity.
During cytokinesis, microfilaments are involved in the formation of the contractile ring
None of the above are incorrect.
Question 3 - 546
Which of the following would allow anaphase to take place?
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Document Summary

Which one of the following is correct about cytokinesis: Cytokinesis leads to segregation of duplicated chromosomes into daughter nuclei. The first hint of cytokinesis in animal cells apears in metaphase. A cell plate a formed during cytokinesis of an animal cell. The mechanism of cytokinesis in animal cells is in an opposite direction of that of plant cells. An active protease called separase is released . Cdh1 binds apc ubiquinates anaphase inhibitor which is called securin. Separase cleaves cohesins that hold sister chromatids together. anaphase begins when sister chromatids separate. Animal cells and plant cells go through cytokinesis through different mechanisms. Plant cells conduct cytokinesis through an inside to outside mechanism. Plant cells conduct cytokinesis through an outside to inside mechanism. Animal cells conduct cytokinesis through an outside to inside mechanism. Animal and plant cells conduct cytokinesis through an inside to outside mechanism. A phragmoplast uses an inside-out mechanism to form the cell plate.

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