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【单选题】
What is a possible consequence if the mother does not respond to her child's signals?A.
The child will make little effort to speak.
B.
The child will speak properly all the same.
C.
The child will stop giving out signals
D.
The child will develop a language of its own.
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【多选题】Explain why a cell’s response to a signal can be fast or slow.
A.
The length of time a cell takes to respond to an extracellular signal can vary greatly, depending on what needs to happen once the message has been received.
B.
Some extracellular signals act swiftly: acetylcholine can stimulate a skeletal muscle cell to contract within milliseconds and a salivary gland cell to secrete within a minute or so. Such rapid responses are possible because, in each case, the signal affects the activity of proteins that are already present inside the target cell, awaiting their marching orders.
C.
Other responses take more time. Cell growth and cell division, when triggered by the appropriate signal molecules, can take many hours to execute.
D.
This is because the response to these extracellular signals requires changes in gene expression and the production of new proteins.
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