Concept explainers
Introduction:
The timing and rate of cell division are very important to the well- being of an organism. The rate of cell division varies depending on the type of cell. There is mechanism involving proteins and enzymes that control mitosis. A combination of these two substances is required to signal the cellular reproduction processes.
Answer to Problem 8STP
Correct answer :
The correct answer is option B. Cyclin builds up
Explanation of Solution
Explanation/justification for the correct answer:
Option B. Cyclin builds up−Cell cycle is controlled by a mechanism involving certain proteins and enzymes. Proteins called cyclins bind to enzymes called cyclin- dependent kinases (CDK) during the stages of interphase and mitosis to signal the cell to start the process of cell cycle. Different cyclin and CDK combinations control different activities at different stages of cell cycle. Hence, this is the correct option.
Explanation for incorrect answer:
Option A. Cells touch each other−Cyclinsbind to enzymes called cyclin- dependent kinases (CDK) during the stages of interphase and mitosis to signal the cell to start the process of cell cycle. Touching of cells do not trigger mitosis. Hence, this is not the correct option.
Option C. Environmental conditions are poor- Cyclinsbind to enzymes called cyclin- dependent kinases (CDK) during the stages of interphase and mitosis to signal the cell to start the process of cell cycle. Environmental conditions do not control cell cycle. Hence, this is not the correct option.
Option D. Growth factors are absent- Cyclinsbind to enzymes called cyclin- dependent kinases (CDK) during the stages of interphase and mitosis to signal the cell to start the process of cell cycle. Growth factors do not control mitosis. Hence, this is not the correct option.
Chapter 11 Solutions
Biology Illinois Edition (Glencoe Science)
Additional Science Textbook Solutions
Biology: Life on Earth with Physiology (11th Edition)
Campbell Essential Biology (6th Edition) - standalone book
Human Anatomy & Physiology (11th Edition)
Microbiology with Diseases by Body System (4th Edition)
Becker's World of the Cell (9th Edition)
Campbell Biology (11th Edition)
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