Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 16.2, Problem 1CC
Summary Introduction
To describe:
The functions of three types of microtubules.
Introduction:
Microtubule growth and organization is initiated at two centrosomes which are also called microtubule-organizing centers Mitotic spindles are composed of microtubules, which are the major components of the cytoskeleton. Astral, polar and kinetochore microtubules are three types of spindle microtubules.
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Objective: To review the phases of mitosis with the understanding that in a real tissue or a non-synchronized cell culture, different mitotic phases and cells in interphase will be observed at a certain time.
Interphase is the period between mitotic events; all other phases are part of mitosis and their individual probabilities add up to the total probability of seeing cells undergoing mitosis.
Pay attention to the individual probabilities for cells in each phase of the cell cycle.
Problem N° 10
For a certain type of animal tissue, the probability of a randomly selected cell being in a particular stage of the interphase/mitosis cycle is given by the following table:
Stage
Probability
Interphase
0.5
Prophase
0.1
Metaphase
0.05
Anaphase
0.2
Telophase
0.15
Suppose you examine 100 cells at random from this tissue.
A) How many cells do you expect to see in metaphase? _____ cells
B) You have selected a high magnification (2000 X) in your…
Comparing Mitosis and Meiosis:
How many cells at the end?
The ploidy of the end cells?
The purpose of the process (when is it used)?
The differences in the steps of each process (eg - how are metaphase, metaphase I, and metaphase II different)?
Need help fast
What molecular mechanisms operate to ensure that once the decision to advance through the restriction point has been made, this leads to an essentially irreversible commitment to complete the remaining phases of the cell cycle through M phase?
Chapter 16 Solutions
Biology
Ch. 16.1 - Researchers usually treat cells with drugs that...Ch. 16.1 - Which phases make up interphase?Ch. 16.1 - Prob. 1CSCh. 16.1 - Prob. 1EQCh. 16.1 - The Eukaryotic Cell Cycle CoreSKILL What...Ch. 16.1 - Prob. 3EQCh. 16.2 - Prob. 1CCCh. 16.2 - Mitotic Cell Division Concept Check: What are the...Ch. 16.3 - Core Skill: Modeling The goal of this modeling...Ch. 16.4 - Sexual Reproduction Concept Check: What is the...
Ch. 16.5 - Variation in Chromosome Structure and Number...Ch. 16 - Prob. 1TYCh. 16 - Prob. 2TYCh. 16 - Prob. 3TYCh. 16 - Prob. 4TYCh. 16 - Prob. 5TYCh. 16 - Which of the following is not an event of anaphase...Ch. 16 - Prob. 7TYCh. 16 - Which of the following statements accurately...Ch. 16 - Prob. 9TYCh. 16 - Aneuploidy may be the result of a. duplication of...Ch. 16 - Prob. 1CQCh. 16 - Prob. 2CQCh. 16 - Prob. 3CQCh. 16 - Prob. 1COQCh. 16 - A diploid eukaryotic cell has 10 chromosomes (5...
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- VISUALIZE Sketch a roughly cuboidal cell preparing to divide. Indicate the orientation of the preprophase band and the site where the new cell walls of the daughter cells will form.arrow_forwardWHAT IF? What might be the resultif the cell ignored either checkpoint andprogressed through the cell cycle?arrow_forwardCell Cyle and Checkpoints Story Make a creative short story about the phases of cell cycle and its checkpoints. Highlight each function of the checkpoints and the characteristics of the cell during the different stages of the cycle.arrow_forward
- Task: Show your work/explain your reasoning as much as possible. If a certain species has a DNA content of 12 picograms in each diploid cell's nucleus when the cell in in G1 of the cell cycle, what would be the expected DNA content (in picograms) of a triploid cell (from the same species) in mitotic prophase? Consider ploidy changes and/or chromosome form changes, if applicable, when explaining your reasoning.arrow_forwardApply Evolutionary Thinking The genes and proteins involved in cell cycle regulation in prokaryotes and eukaryotes are very different. However, both types of organisms use similar molecular regulatory reactions to coordinate DNA synthesis with cell division. What does this observation mean from an evolutionary perspective?arrow_forwardQ1: Do all cells in an organism enter each stage of mitosis at the same time? (Hint: See image of onion root tip at far left in the figure.) Q2: What happens between the end of interphase and early prophase that changes the appearance of the chromosomes? Q3: Explain in your own words the role of the mitotic spindle in mitosis.arrow_forward
- MAKE CONNECTIONS Review Figure 12.16 on cell cyclecontrol. Would you expect MPF (maturation-promotingfactor) activity to remain steady during cleavage? Explain.arrow_forwardPlease ASAP Consider a diploid species with a deploid number 2. Show your work and explain your part. A. If a typical haploid gemete from this species contains DNA with a mass of 36 picograms of DNA would be in a typical somatic cell in G1 of the cell cycle?arrow_forwardDO NOT COPY IN GOOGLE OR BARTLEBY QUESTIONS: -What is meant by a cell cycle checkpoint? -What is its importance? -How does a cell stop it's progress at one of these checkpoints?arrow_forward
- 2a. Desribe the four phases of the cell cycle, and which ones define interphase? In which phase(s) is DNA replicated? 2b. Describe the 5 steps in M phase, and what happens to chromosomes during each? And draw out what the chromosomes and cell look like during each.arrow_forwardAnimals and plants both have diploid and haploid cells. How does the animal life cycle differ from the alternation of generations exhibited hy plants?arrow_forwardQuick help!!! Answer the following questions Only in cell biology 1. A. Discuss the roles of two main types of genes that are critical in cancer? B. What is the difference between a totipotent and a pluripotent stem cell? Give an example to each.arrow_forward
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