10. Cell Signaling
Introduction to Cell Signaling
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Practice this topic
- Multiple Choice
The cells of multicellular organisms use a variety of molecules as signals which are
a) Amino acids and proteins.
b) Nucleotides and lipids.
c) Dissolved gases like nitric oxide.
d) Only a and b.
e) a, b, and c.
- Multiple Choice
Which of the following is likely to be a response by a receptor protein to an approaching signal molecule?
a) The receptor protein binds to the signal if it has a complementary shape.
b) If the signal is able to bind to the receptor it induces a change in the receptor protein's shape.
c) The change in the receptor protein's shape results in cellular action.
d) All of the above are correct.
- Multiple Choice
Signal transduction pathways:
a) Are necessary for signals to cross the membrane.
b) Include the intracellular events caused by a signal binding to a receptor.
c) Include the extracellular events caused by a signal binding to a receptor.
d) Carry a signaling molecule to the nucleus of a cell.
- Multiple Choice
What does it mean to say that a signal is transduced?
a) The signal enters the cell directly and binds to a receptor inside.
b) The physical form of the signal changes as it passes from the cell membrane to the intracellular target.
c) The signal is amplified, such that even one signal molecule evokes a large response.
d) The signal triggers a sequence of phosphorylation events inside the cell.
- Open QuestionBinding of a signaling molecule to which type of receptor leads directly to a change in the distribution of substances on opposite sides of the membrane?a. intracellular receptorb. G protein-coupled receptorc. phosphorylated receptor tyrosine kinase dimerd. ligand-gated ion channel
- Open QuestionWhat does it mean to say that a signal is transduced?a. The signaling molecule enters the cell directly and elicits a cellular response.b. The signal is generated by the production of proteins.c. The physical form of the signal changes between the outside of the cell and the inside.d. The signal is amplified.