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

Short Answer

Expert verified

(A) The option “cells with more than one nucleus” is true.

(B) The option “cells that are unusually small” is false.

(C) The option “cells lacking nuclei” is false.

(D) The option “cell cycles lacking an S phase” is false.

Step by step solution

01

Description of mitosis

Mitosis is one of the types of cell division that results in the formation of identical daughter cells. This process is used to replace the repaired cells and is vital for the growth of an organism.

02

Explanation of option (A)

Cytokinesis is the process of separation of cytoplasm that happens with the formation of the cleavage furrow. It is the final step of cell division.

In some cells, mitosis will occur without cytokinesis, resulting in the formation of cells with more than one nucleus. For example, osteoclasts are the bone cells that are multinucleated cells formed without the cytokinesis process.

Therefore, the given statement is true.

03

Explanation of option (B)

The absence of cytokinesis in the mitosis phenomena does not create unusually small cells. Without the cytokinesis process, the cells do not divide properly.

The formation of unusually small does not occur in the absence of the cytokinesis mechanism.

Therefore, the given statement is false.

04

Explanation of option (C)

The cells without a nucleus are formed due to the coiling of chromosomal structures. The examples of cells that do not have a nucleus are erythrocytes.

The lack of cytokinesis is not linked with the absence of a nucleus.

Therefore, the given statement is false.

05

Explanation of option (D)

The synthesis phase is the crucial phase in which whole genetic material is copied to produce another set of genetic material. Cell lacking S phase does not have replicated DNA to give to two daughter cells.

The absence of cytokinesis will not cause any effects on the S phase or DNA synthesis.

Therefore, the given statement is false.

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Most popular questions from this chapter

Shown here are two HeLa cancer cells that are just completing cytokinesis. Explain how the cell division of cancer cells like these is misregulated. Identify genetic and other changes that might have caused these cells to escape normal cell cycle regulation.

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

The histogram representing the treated sample shows the effect of growing the cancer cells alongside human umbilical cord stem cells that produce the potential inhibitor. (a) Label the histogram with the cell cycle phases. Which phase of the cell cycle has the greatest number of cells in the treated sample? Explain. (b) Compare the distribution of cells among G1, S, and G2 phases in the control and treated samples. What does this tell you about the cells in the treated sample? (c) Based on what you learned in Concept 12.3, propose a mechanism by which the stem cell-derived inhibitor might arrest the cancer cell cycle at this stage. (More than one answer is possible.)

(a) In the control sample histogram, identify the phase of the cell cycle (G1, S, or G2) of the population of cells in each region delineated by vertical lines. Label the histogram with these phases and explain your answer. (b) Does the S phase population of cells show a distinct peak in the histogram? Why or why not?

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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