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What is apoptosis?
a. an experimental technique used to kill specific cells
b. programmed cell death that is required for normal development
c. a pathological condition observed only in damaged or diseased organisms
d. a developmental mechanism unique to the roundworm C. elegans
Introduction:
Usually, cells produce signals that trigger them to differentiate and divide. Apoptosis is a phenomenon that occurs in multicellular organisms in a programmed and controlled manner, where cells die as a result of a signal triggering death.
Answer to Problem 1TYK
Correct answer:
Apoptosis is defined as the process where the cell death is already programmed, which is a controlled and normal process.
Explanation of Solution
Explanation/Justification for the correct answer:
Option (b) is given that apoptosis is programmed cell death, which is necessary and is carried out for normal development of the organism. It is a programmed process and is highly regulated for normal functioning of body and immune cells and normal cell turnover. Hence, Option (b) is correct.
Explanation for incorrect answers:
Option (a) is given that apoptosis is an experimental technique used to kill specific cells. The apoptosis is not an experimental technique used to kill only specific cells; instead, it is a programmed process and is carried out by most of the normal cells. So, it is a wrong answer.
Option (c) is given that apoptosis is a pathological condition observed only in the damaged or diseased organism. The apoptosis is not a pathological condition observed in diseased tissue and has a controlled mechanism. So, it is a wrong answer.
Option (d) is given that apoptosis is a developmental mechanism unique to the roundworm Caenorhabditis elegans. Caenorhabditis elegans is a pseudocoelomate, which lacks a circulatory and a respiratory system. The apoptosis process is not a developmental mechanism of Caenorhabditis elegans. So, it is a wrong answer.
Hence, options (a), (c), and (d) are incorrect.
Thus, apoptosis is the programmed cell death in an organism.
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Chapter 21 Solutions
Biological Science (6th Edition)
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