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Q1 (25 points) Consider the circuit below, the Op Amp is ideal. Assume all resistors other than

are

. (a) ( 10 points) Calculate the relation between output voltage

and the input voltage

. (b) (5 points) Over what range of

does the Op Amp work in the linear regime? (c) ( 5 points) In the linear regime, what values should we choose the input voltage

and the load resistance

to achieve the maximum power on the load resistance

? What is the maximum power? (d) (5 points) Under the condition in (c), what is the output current of the Op Amp

? Does it flow into or out of the Op-Amp?

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?990 Question 7 of 19 Stacked Part H Suppose you can synthesize a short duplex DNA fragment with ary sequence you desire. With this synthetic fragment and the procedures described in parts A through G, you could remove an EcoRI restriction site from a DNA molecule and incorporate a new BamHI restriction site at approximately the same location. There are at least two different methods for replacing an EcoRI restriction site with a BamHI restriction site. Complete the passage describing the method that inserts a DNA fragment with blunt ends. Cut the DNA with

then treat the DNA with

to create blunt ends. Then ligate a synthetic fragment with the

recognition sequence between the two resulting blunt ends. A second method would be to synthesize a DNA fragment that would ligate efficiently to the sticky ends generated by EcoRI cleavage and introduce a BamHI cleavage site, without regenerating the EcoRI cleavage site. Select the synthetic DNA fragment you could use to replace an EcoRI restriction site with a BamHI restriction site.

-GATCGAATTC-3'

-CTTAAGCTAG-5

5'-TTAAGGATCC-3'

-AATTGGATCC-3' 3'-CCTAGGITAA-5'

AATTCCTAGG-3'

-CCTAGGAATT-

3'-GGATCCTTAA=5'

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Two samples are selected from the same population. For each of the following, calculate how much dif- ference is expected, on average, between the two sample means. a. One sample has n = 4, the second has n = 6, and the pooled variance is 60. b. One sample has n = 12, the second has n = 15, and the pooled variance is 60. c. In part b, the sample sizes are larger, but the pooled variance is unchanged. How does larger sample size affect the magnitude of the standard error for the sample mean difference?

A patient with a large surgical wound that is healing by secondary intention has an order for the wound to be packed with gauze that has been moistened in saline. Which of the following steps in packing a wound is incorrect?

In case of a deep wound, wear sterile gloves

Avoid placing gauze in the sinus tract or an undermined area of the wound.

Pack the wound gently

Cover moist gauze packing with dry sterile gauze

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Which of the following statements best describes auditors' responsiblity to detect errors and frauds? Multiple Choice 1136.24 init

Audiors should design an audit to provide reasonable assurance of detecting emors and traust that are material to the financial statement.

Auditors are responsible to detect material errors, but have no responsibity to detect molerial frods that are concealed through employee collusion or management overide of the internal compol structure.

Auditors have no responsibility to detect errors and frads uniess analyical procedures or tests of transactions identify conditors causing a reasonably prudent auditor to suspect that the financial statements were materially misstated.

Audiors have no responsibily to detect errors and frads because an audior is not an insurer and an budi does notconstitue a guarantee. 28 of 50 Neast 4 c raw III

A student performs two melting-point determinations on a crystalline product. In one determination, the capillary tube contains a sample about 12 mm in height and the melting range is found to be 141\deg 142\deg C. In the other determination, the sample height is 45 mm and the melting range is found to be 141\deg 145\deg C. Explain the broader melting-point range observed for the second sample. The reported melt- ing point for the compound is 143\deg C.2. Another student reports a melting range of 136\deg 138\deg C for the compound in Question 1 and mentions in her notebook that the rate of heating was about 12\deg per minute. NMR analysis of this students product does not reveal any impurities. Explain the low melting point.

Payments to shareholders from corporate profits are known as:

1) dividends.

2) capital gains.

3) interest.

4) appreciation.