Multiple Choice
What is apoptosis and what is its primary purpose in cellular processes?
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10. Cell Signaling
Introduction to Cell Signaling
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What is the primary difference between intracellular signaling and intercellular signaling?
A
Intracellular signaling involves the release of hormones, while intercellular signaling involves neurotransmitters.
B
Intracellular signaling is limited to prokaryotic cells, while intercellular signaling is found only in eukaryotic cells.
C
Intracellular signaling occurs within a single cell, while intercellular signaling occurs between different cells.
D
Intracellular signaling requires cell surface receptors, while intercellular signaling does not.
Verified step by step guidance1
Understand the definitions: Intracellular signaling refers to the communication processes that occur within a single cell, involving the transmission of signals from one part of the cell to another. Intercellular signaling, on the other hand, involves communication between different cells, often through signaling molecules like hormones or neurotransmitters.
Identify the key components: In intracellular signaling, the focus is on pathways and molecules such as second messengers, kinases, and phosphatases that operate within the cell. For intercellular signaling, the focus is on signaling molecules that travel from one cell to another, such as hormones and neurotransmitters.
Consider the context of signaling: Intracellular signaling is crucial for processes like metabolism, cell division, and apoptosis within a cell. Intercellular signaling is essential for coordinating activities between cells, such as in tissue development, immune responses, and neural communication.
Evaluate the options given: The correct distinction is that intracellular signaling occurs within a single cell, while intercellular signaling occurs between different cells. This is a fundamental difference in the scope and function of the signaling processes.
Clarify misconceptions: Intracellular signaling does not necessarily involve the release of hormones, which are typically involved in intercellular signaling. Both prokaryotic and eukaryotic cells can have intracellular signaling, and cell surface receptors can be involved in both types of signaling, depending on the context.
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