Chapter 12, Problem 6STP

Summary Introduction

Introduction:

Cell division and apoptosis are two very important aspects of growth and development of an organism. Cell division helps in growth and repair of tissues. Apoptosis refers to programmed death of cells which results in decrease in number of cells. A series of events lead to complete destruction of cells undergoing apoptosis.

Answer to Problem 6STP

Correct answer :

The correct answer is option A. cells between fingers

Explanation of Solution

Explanation/justification for the correct answer:

Option A. cells between fingers − When the hands and feet begin to develop, cells occupy spaces between the fingers and toes. This tissue undergoes apoptosis, with the cells shriveling and dying at the appropriate time so that webbing is not present in the mature organism.

Hence, this is the correct option.

Explanation for incorrect answer:

Option B. cells reproducing normally- Normal reproducing cells do not undergo apoptosis. Only those cells that are programmed for death undergo apoptosis. Hence, this is not the correct option.

Option C. cells reproducing slowly- Apoptosis occurs in cells that are damaged beyond repair, including cells with DNA damage that could lead to cancer. Slow reproducing cells do not undergo apoptosis if there is no damage in DNA. Hence, this is not the correct option.

Option D. cells surrounding the heart- Healthy cells of heart do not undergo apoptosis. Apoptosis occurs in cells that are damaged beyond repair, including cells with DNA damage that could lead to cancer. Hence, this is not the correct option.