THE CELL
CELL COMMUNICATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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An inactive molecule that blocks the active site of the receptor
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Binding of a ligand to a receptor
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Amplification of the signal
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Second messengers
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Detailed explanation-1: -A substance that blocks signals passed from one molecule to another inside a cell. Blocking these signals can affect many functions of the cell, including cell division and cell death, and may kill cancer cells.
Detailed explanation-2: -A Signal Transduction Pathway may be disrupted because of internal or external factors. Internal factors include changes in the cells themselves, commonly called mutations. External factors include environmental parameters like temperature, PH, Chemicals, and many more.
Detailed explanation-3: -Plus, many mutations in receptor proteins and other parts of signal transduction pathways can shut down important cellular growth pathways that stop a cell from dividing too much. If these pathways are overactivated it can lead to the development of cancerous cells.
Detailed explanation-4: -So, the correct answer is a. The pathway is initiated when a signal (ligand) binds an appropriate receptor.