Domanda del libro di testo
Which of the following occurs during S phase?
a. Condensation of the chromosomes
b. Replication of the DNA
c. Separation of sister chromatids
d. Spindle formation
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Ch. 12 - The Cell Cycle
Urry12th EditionCampbell BiologyISBN: 9785794169850
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TOC.tableOfContents
- 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 Cycle11
- Ch. 13 - Meiosis and Sexual Life Cycles10
- Ch. 14 - Mendel and the Gene Idea14
- Ch, 15 - The Chromosomal Basis of Inheritance6
- 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 Biotechnology7
- 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 Earth8
- Ch. 26 - Phylogeny and the Tree of Life8
- Ch. 27 - Bacteria and Archaea6
- Ch. 28 - Protists7
- Ch. 29 - Plant Diversity I: How Plants Colonized Land7
- Ch. 30 - Plant Diversity II: The Evolution of Seed Plants6
- 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 Development10
- Ch. 36 - Resource Acquisition and Transport in Vascular Plants8
- Ch. 37 - Soil and Plant Nutrition11
- 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 System5
- Ch. 44 - Osmoregulation and Excretion6
- Ch. 45 - Hormones and the Endocrine System8
- Ch. 46 - Animal Reproduction9
- 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 Ecology9
- Ch. 54 - Community Ecology9
- Ch. 55 - Ecosystems and Restoration Ecology8
- Ch. 56 - Conservation Biology and Global Change6
Capitolo 12, Problema 5a
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
Guida verificata passo dopo passo1
Understand the key terms in the problem: Mitosis is the process of nuclear division, where the genetic material is divided into two nuclei. Cytokinesis is the division of the cytoplasm, resulting in two separate cells. If cytokinesis does not occur, the cytoplasm is not divided, but mitosis still produces multiple nuclei within a single cell.
Analyze the options provided: a) Cells with more than one nucleus, b) Cells that are unusually small, c) Cells lacking nuclei, d) Cell cycles lacking an S phase. Consider the biological implications of mitosis without cytokinesis for each option.
Eliminate incorrect options: Option b (cells that are unusually small) is incorrect because the size of the cell is not directly affected by the absence of cytokinesis. Option c (cells lacking nuclei) is incorrect because mitosis ensures the formation of nuclei. Option d (cell cycles lacking an S phase) is incorrect because the S phase, where DNA replication occurs, is a prerequisite for mitosis and is not skipped.
Focus on the correct option: If mitosis occurs without cytokinesis, the result is a single cell containing multiple nuclei, as the nuclei divide but the cytoplasm does not separate into individual cells.
Conclude that the correct answer is option a (Cells with more than one nucleus), as this is the direct result of mitosis without cytokinesis.
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Mitosis
Mitosis is the process of cell division where a single cell divides to produce two genetically identical daughter cells. It involves several stages: prophase, metaphase, anaphase, and telophase, which ensure that the duplicated chromosomes are evenly distributed. Understanding mitosis is crucial for recognizing how cells replicate and maintain genetic continuity.
Video consigliato:
03:21
Phases of Mitosis
Cytokinesis
Cytokinesis is the final step of cell division, occurring after mitosis, where the cytoplasm of a parental cell divides into two daughter cells. In some organisms, cytokinesis may not occur, leading to the formation of multinucleated cells. This process is essential for ensuring that each daughter cell receives the necessary cellular components and organelles.
Video consigliato:
01:25Cytokinesis
Multinucleation
Multinucleation refers to the presence of multiple nuclei within a single cell, which can occur when mitosis happens without cytokinesis. This phenomenon is observed in certain organisms and cell types, such as muscle fibers and some fungi, and can affect cellular function and growth. Understanding multinucleation helps explain the implications of abnormal cell division.
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07:30Protist Cells 3
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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
3219
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Domanda del libro di testo
One difference between cancer cells and normal cells is that cancer cells
a. Are unable to synthesize DNA
b. Are arrested at the S phase of the cell cycle
c. Continue to divide even when they are tightly packed together
d. Cannot function properly because they are affected by density-dependent inhibition
2918
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Domanda del libro di testo
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
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Domanda del libro di testo
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
3426
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Domanda del libro di testo
Which of the following occurs during apoptosis?
a. Lysis of the cell
b. Direct contact between signaling cells
c. Fragmentation of the DNA
d. Release of proteases outside the cell
3223
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