Campbell Biology (10th Edition)

Published by Pearson
ISBN 10: 0321775651
ISBN 13: 978-0-32177-565-8

Chapter 11 - Test Your Understanding - Level 1 - Knowledge/Comprehension: 5


(c) Lysis of the cell

Work Step by Step

Apoptosis is always triggered via a cell-signaling pathways. Both internal and external signals may begin a signal transduction pathway, activating such proteins as Ced-3 and Ced-4 which then activate other proteins that destroy the cell. Thus, answer option "(b) Cell-signaling pathways" is eliminated. Referenced on page 228, "cellular agents chop up the DNA" and during blebbing, the cellular contents are packaged into vesicles which are "digested by specialized scavenger cells," eliminating answer options "(a) Fragmentation of the DNA" and "(d) Digestion of cellular contents by scavenger cells." This leaves answer option "(c) Lysis of the cell." Cell lysis refers to the bursting open of a cell to release its contents, which is not what occurs during blebbing, the shrinking of the cell and splitting off of vesicles.
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