Textbook Question
The decline of MPF activity at the end of mitosis is due to
a. The destruction of the protein kinase Cdk
b. Decreased synthesis of Cdk
c. The degradation of cyclin
d. The accumulation of cyclin
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Ch. 12 - The Cell Cycle
Urry11th EditionCampbell BiologyISBN: 9789357423311
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Table of contents
- Ch. 1 - Evolution, the Themes of Biology, and Scientific Inquiry8
- Ch. 2 - The Chemical Context of Life8
- Ch. 3 - Water and Life6
- Ch. 4 - Carbon and the Molecular Diversity of Life9
- Ch. 5 - The Structure and Function of Large Biological Molecules9
- Ch. 6 - A Tour of the Cell6
- Ch. 7 - Membrane Structure and Function6
- Ch. 8 - An Introduction to Metabolism6
- Ch. 9 - Cellular Respiration and Fermentation10
- Ch. 10 - Photosynthesis7
- Ch. 11 - Cell Communication7
- Ch. 12 - The Cell Cycle10
- Ch. 13 - Meiosis and Sexual Life Cycles10
- Ch. 14 - Mendel and the Gene Idea14
- Ch, 15 - The Chromosomal Basis of Inheritance7
- Ch. 16 - The Molecular Basis of Inheritance9
- Ch. 17 - Gene Expression: From Gene to Protein9
- Ch. 18 - Regulation of Gene Expression10
- Ch. 19 - Viruses6
- Ch. 20 - DNA Tools and Biotechnology8
- Ch. 21 - Genomes and Their Evolution8
- Ch. 22 - Descent with Modification: A Darwininan View of Life6
- Ch. 23 - The Evolution of Populations5
- Ch. 24 - The Origin of Species6
- Ch. 25 - The History of Life on Earth6
- Ch. 26 - Phylogeny and the Tree of Life7
- Ch. 27 - Bacteria and Archaea8
- Ch. 28 - Protists7
- Ch. 29 - Plant Diversity I: How Plants Colonized Land7
- Ch. 30 - Plant Diversity II: The Evolution of Seed Plants7
- Ch. 31 - Fungi5
- Ch. 32 - An Overview of Animal Diversity4
- Ch. 33 - An introduction to Invertebrates6
- Ch. 34 - The Origin and Evolution of Vertebrates7
- Ch. 35 - Vascular Plant Structure, Growth, and Development8
- Ch. 36 - Resource Acquisition and Transport in Vascular Plants8
- Ch. 37 - Soil and Plant Nutrition10
- Ch. 38 - Angiosperm Reproduction and Biotechnology8
- Ch. 39 - Plant Responses to Internal and External Signals8
- Ch. 40 - Basic Principles of Animal Form and Function8
- Ch. 41 - Animal Nutrition7
- Ch. 42 - Circulation and Gas Exchange7
- Ch. 43 - The Immune System6
- Ch. 44 - Osmoregulation and Excretion6
- Ch. 45 - Hormones and the Endocrine System8
- Ch. 46 - Animal Reproduction8
- Ch. 47 - Animal Development8
- Ch. 48 - Neurons, Synapses, and Signaling6
- Ch. 49 - Nervous Systems8
- Ch. 50 - Sensory and Motor Mechanisms5
- Ch. 51 Animal Behavior6
- Ch. 52 - An Introduction to Ecology and the Biosphere7
- Ch. 53 - Population Ecology10
- Ch. 54 - Community Ecology9
- Ch. 55 - Ecosystems and Restoration Ecology8
- Ch. 56 - Conservation Biology and Global Change6
Chapter 12, Problem 7
Cell A has half as much DNA as cells B, C, and D in a mitotically active tissue. Cell A is most likely in
a. G1
b. G2
c. Prophase
d. Metaphase
Verified step by step guidance1
Understand the cell cycle phases: The cell cycle consists of interphase (G1, S, G2) and mitosis (prophase, metaphase, anaphase, telophase). During interphase, the cell grows and duplicates its DNA.
Identify DNA content in each phase: In G1 phase, the cell has a single set of DNA. During S phase, DNA replication occurs, doubling the DNA content. In G2 phase, the cell has twice the DNA content as in G1. During mitosis, the DNA content remains doubled until cytokinesis.
Analyze the given information: Cell A has half the DNA content compared to cells B, C, and D. This suggests that Cell A has not yet undergone DNA replication.
Determine the phase of Cell A: Since Cell A has half the DNA content, it is likely in the G1 phase, where the DNA has not yet been replicated.
Conclude the reasoning: Based on the DNA content, Cell A is most likely in the G1 phase, as it has not yet entered the S phase where DNA replication occurs.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Cell Cycle Phases
The cell cycle consists of distinct phases: G1, S, G2, and M. G1 is the first gap phase where the cell grows and prepares for DNA replication. S phase is where DNA replication occurs, doubling the DNA content. G2 is the second gap phase, where the cell prepares for mitosis. M phase includes mitosis and cytokinesis, where the cell divides into two daughter cells.
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DNA Content During Cell Cycle
DNA content varies throughout the cell cycle. In G1, cells have a normal diploid amount of DNA. During S phase, DNA is replicated, doubling the DNA content. In G2, cells maintain this doubled DNA content until mitosis, where the DNA is equally divided between two daughter cells. Understanding DNA content helps identify the cell cycle phase.
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Mitosis Stages
Mitosis is divided into stages: prophase, metaphase, anaphase, and telophase. Prophase involves chromatin condensation into visible chromosomes. Metaphase is characterized by chromosomes aligning at the cell's equatorial plane. Anaphase involves the separation of sister chromatids, and telophase concludes with the formation of two nuclei. DNA content remains doubled until cytokinesis.
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Related Practice
Textbook Question
In the cells of some organisms, mitosis occurs without cytokinesis. This will result in
a. Cells with more than one nucleus
b. Cells that are unusually small
c. Cells lacking nuclei
d. Cell cycles lacking an S phase
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Textbook Question
Which of the following does not occur during mitosis?
a. Condensation of the chromosomes
b. Replication of the DNA
c. Separation of sister chromatids
d. Spindle formation
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Textbook Question
The drug cytochalasin B blocks the function of actin. Which of the following aspects of the animal cell cycle would be most disrupted by cytochalasin B?
a. Spindle formation
b. Spindle attachment to kinetochores
c. Cell elongation during anaphase
d. Cleavage furrow formation and cytokinesis
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Textbook Question
The light micrograph shows dividing cells near the tip of an onion root. Identify a cell in each of the following stages: prophase, prometaphase, metaphase, anaphase, and telophase. Describe the major events occurring at each stage.
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Textbook Question
Draw one eukaryotic chromosome as it would appear during interphase, during each of the stages of mitosis, and during cytokinesis. Also, draw and label the nuclear envelope and any microtubules attached to the chromosome(s).
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