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Lecture 9

BIOL 1201 Lecture Notes - Lecture 9: Myelin, Axon Hillock, Protein Kinase

Biological Sciences
Course Code
BIOL 1201
Bill Wischusen

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1. Which of these receptors is NOT a membrane receptor?
a. E
2. Which of these is a G-protein-linked receptor?
a. A
3. Which of these is a receptor tyrosine or kinase?
a. C
4. Which of these is an ion-channel receptor?
a. D
5. The binding of signal molecules to ____ results in the phosphorylation of tyrosines.
a. C
6. Which of these receptor molecules would allow Na+ to flow into the cell?
a. D
7. Which of these extracellular signal molecules could diffuse through a plasma membrane
and bind to an intracellular receptor?
a. Estrogen
8. A(n) _____ is an example of a signal molecule that can bind to an intracellular receptor
and thereby cause a gene to be turned on or off.
a. Steroid
9. _____ is a signal molecule that binds to an intracellular receptor
a. D
10. Thyroid hormones bind to _____ receptors.
a. Intracellular
11. Which of these is a logical signal transduction pathway?
a. A G-protein-linked receptor activates G protein, which activates
phospholipase C, which cleaves a membrane lipid to form IP3, which binds to
a calcium channel on the ER, which opens to release calcium ions into the
cytoplasm, which bind to an intracellular enzyme that carries out a response.
12. Which of these acts as a second messenger?
a. D
13. Which of these is responsible for initiating a signal transduction pathway?
a. A
14. What role does a transcription factor play in a signal transduction pathway?
a. By binding to DNA it triggers the transcription of a specific gene
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15. In this animation, which of the following, when activated by a signal transduction
pathway, moved from the cytoplasm to the nucleus of a cell?
a. Transcription factor
16. Which of these is a membrane receptor?
a. B
17. A signal transduction pathway is initiated when a _____ binds to a receptor.
a. Signal molecule
18. Which of these acts as a second messenger?
a. Cyclic AMP
19. Calcium ions that act as second messengers are stored in _____.
a. Endoplasmic reticula
20. _____ catalyzes the production of _____, which then opens an ion channel that releases
_____ into the cell's cytoplasm.
a. Phospholipase C … IP3 … Ca^2+
21. A protein kinase activating many other protein kinases is an example of _____.
a. Amplification
22. A neuron's nucleus is located in its _____.
a. Cell body
23. A nerve impulse moves toward a neuron’s cell body along _____.
a. Dendrites
24. A nerve impulse moves away from a neuron’s cell body along ____.
a. Axon
25. An impulse relayed along a myelinated axon “jumps” from ____ to ____.
a. Node of Ranvier, Node of Ranvier
26. Axons insulated by a(n) _____ are able to conduct impulses faster than those not so
a. Myelin sheath
27. What type of cell makes up the myelin sheath of a motor neuron?
a. Schwann cells
28. What part of a neuron relays signals from one neuron to another neuron or to an effector?
a. Synaptic terminal
29. Which term describes the difference in electrical charge across a membrane?
a. Membrane potential
30. Resting neurons are most permeable to which of the following ions?
a. K+
31. T or F? The potential energy of a membrane potential comes solely from the difference in
electrical charge across the membrane.
a. F
32. Which channel is mainly responsible for the resting potential of a neuron?
a. Potassium leak channel
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