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Ch. 12 - The Cell Cycle
Campbell - Campbell Biology 11th Edition
Urry11th EditionCampbell BiologyISBN: 9789357423311Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoUrry 11th EditionCh. 12 - The Cell CycleProblema 1
Capitolo 12, Problema 1

Through a microscope, you can see a cell plate beginning to develop across the middle of a cell, and nuclei forming on either side of the cell plate. This cell is most likely
a. An animal cell in the process of cytokinesis
b. A plant cell in the process of cytokinesis
c. A bacterial cell dividing
d. A plant cell in metaphase

Guida verificata passo dopo passo
1
Understand the process of cytokinesis: Cytokinesis is the division of the cytoplasm of a parent cell into two daughter cells. In plant cells, this involves the formation of a cell plate, while in animal cells, a cleavage furrow forms.
Identify the key observation: The problem states that a cell plate is beginning to develop across the middle of the cell, and nuclei are forming on either side of the cell plate.
Relate the observation to plant cells: In plant cells, cytokinesis occurs through the formation of a cell plate, which eventually develops into a new cell wall separating the two daughter cells. This is different from animal cells, which use a cleavage furrow.
Consider the options: The presence of a cell plate indicates that the cell is undergoing cytokinesis in a plant cell, as this is characteristic of plant cell division.
Eliminate incorrect options: Since a cell plate is not involved in animal cell cytokinesis or bacterial cell division, and metaphase is a stage of mitosis where chromosomes align in the center of the cell, the correct answer is that the cell is a plant cell in the process of cytokinesis.

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Cytokinesis

Cytokinesis is the process during cell division where the cytoplasm of a single eukaryotic cell is divided to form two daughter cells. In plant cells, cytokinesis involves the formation of a cell plate, which eventually develops into the cell wall separating the two new cells. This is distinct from animal cells, which form a cleavage furrow during cytokinesis.
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Cytokinesis

Cell Plate Formation

Cell plate formation is a key feature of cytokinesis in plant cells. It begins with the assembly of vesicles derived from the Golgi apparatus at the center of the cell, which coalesce to form the cell plate. This structure grows outward until it fuses with the cell membrane, leading to the separation of the two daughter cells and the formation of a new cell wall.
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Plate Tectonics and Continental Drift

Plant Cell Division

Plant cell division involves unique processes compared to animal cells, particularly during cytokinesis. The presence of a rigid cell wall necessitates the formation of a cell plate to divide the cell. Observing a cell plate and nuclei forming on either side indicates that the cell is undergoing cytokinesis, a stage following mitosis where the cell physically splits into two distinct cells.
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Importance of Cell Division
Pratica correlata
Domanda del libro di testo

Vinblastine is a standard chemotherapeutic drug used to treat cancer. Because it interferes with the assembly of microtubules, its effectiveness must be related to

a. Disruption of mitotic spindle formation

b. Suppression of cyclin production

c. Myosin denaturation and inhibition of cleavage furrow formation

d. Inhibition of DNA synthesis

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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

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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

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