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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Which of the following statements about development is incorrect?

a. As microtubules lengthen and slide apart, the shape of cells within the ectoderm changes.

b. The extracellular matrix molecule fibronectin guides the movement of cells during development.

c. The furrow formed during mitosis of cells in the developing embryo is centrally located to ensure all cells divide symmetrically.

d. Cell surface cadherins regulate the ability of developing cells to adhere to one another.

e. Integrins are responsible for transmitting information from the extracellular matrix to the cytoskeleton.

Summary Introduction

Introduction:

The development of animals includes many events like cell division, cell migration, and cell adhesion. Cell movements mainly result in changes in cell shape or migration of whole cells. The process of cell migration involves the activity of microtubules, microfilament, and large-scale reorganization of cytoskeletons.

Explanation

Justification/explanation for the correct answer:

Option (c) states that the furrow that is formed during the mitosis of cells in the developing embryo is centrally located in order to ensure that all the cells divide symmetrically. The angles at which the daughter cells are added to older cells as the development goes on during the process of cell division is known as the orientation of the cell. This is determined by the location of the formed furrow that separates the cytoplasm. A formed furrow is in alignment with spindle midpoint that can be centrally positioned leading to the symmetrical division of the cell or can be moved toward one end of the cell leading to the asymmetrical division of the cell. Hence, option (c) is the correct option.

Explanation for the incorrect answer:

Option (a) states that as microtubules lengthen and slide apart, the shape of the cells within the ectoderm changes. The cells become columnar or cube-like in shape due to the microtubules changing the shape of the cell present in the ectoderm. So, it is an incorrect option.

Option (b) states that the extracellular matrix molecule- fibronectin guides the movement of the cells during development...

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