03:30Cell Signaling | Cellular Biology | Medicine Student Lecture | V-Learning™ | sqadia.comsqadia.com576views
Multiple ChoiceThe cells of multicellular organisms use a variety of molecules as signals which area) Amino acids and proteins.b) Nucleotides and lipids.c) Dissolved gases like nitric oxide.d) Only a and b.e) a, b, and c.1916views8rank
Multiple ChoiceWhich 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.1582views4rank
Multiple ChoiceSignal 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.1684views6rank1comments
Multiple ChoiceWhat 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.3494views3rank1comments
Multiple ChoicePharmaceutical researchers are often interested in blocking particular receptor proteins on cell surfaces. What chemical property of a molecule would be most important for this type of application? 645views
Multiple ChoiceEvidence that cell signaling evolved early in the history of life comes from __________. 799views
Multiple ChoiceEarly work on signal transduction and glycogen metabolism by Sutherland indicated that __________. 788views
Multiple ChoiceDifferent types of cells can respond differently to the same signaling molecule. Which of the following explains this apparent paradox? 1456views
Multiple ChoiceWhen steroid hormones enter a cell by simple diffusion, they can be said to do what in terms of concentration? 756views
Multiple ChoiceCells of the gastrointestinal (GI) tract and cells of the heart respond differently to epinephrine because __________. 510views
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