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initial committ. what was I thinking?
author Robert McIntyre <rlm@mit.edu>
date Mon, 27 Sep 2010 16:57:26 -0400
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1 Photoreceptors in the retina (such as cones) have special channels that are open to Na+ in the dark. When light hits photoreceptors, these special channels close. What can you conclude from this?
2 a) Photoreceptors depolarize to light.
3 b) Photoreceptors hyperpolarize to light.
4 c) Photoreceptor voltage does not change in the presence of light.
5 d) None of the above
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8 What happens in a photoreceptor cell (a rod, for example) in response to a light stimulus?
9 a) rod membrane depolarizes because Na+ channels open as a result of a decrease in second messenger cGMP
10 b) rod membrane hyperpolarizes because K+ channels open as a result of a decrease in second messenger cGMP
11 c) rod membrane hyperpolarizes because Na+ channels close as a result of a decrease in second messenger cGMP
12 d) rod membrane depolarize because K+ channels close as a result of a increase in second messenger cGMP
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15 A difference between rods and cones is:
16 a) Rods hyperpolarize to light, while cones depolarize to light
17 b) Rods are much larger than Cones, and more numerous.
18 c) Cones and rods use different types of opsins
19 d) The total volume of all Cones is smaller than that of Rods
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26 To approximate an ideal OpAmp, all OpAmps should:
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28 a) have almost infinite positive open loop gain
29 b) have almost infinite negative open loop gain
30 c) have almost infinite positive output drift
31 d) have almost infinite negative output drift
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37 Normal OpAmps all approximate an ideal OpAmp. An Ideal OpAmp:
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39 I Has infinite positive open loop gain
40 II Has zero open loop gain
41 III Is an IC
42 IV Has zero output drift
43 V Has output drift of -1
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46 a) I,III,V
47 b) II,III,V
48 c) II,V
49 d) I,IV
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54 A difference between the 741 OpAmp and the K2-W OpAmp is:
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56 a) the 741 has a large negative open loop gain while the K2-W has a large positive open loop gain
57 b) the 741 is an IC while the K2-W is not
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64 I