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Which of the following bonds will be most difficult to break?
1. C–O
2. C–C
3. C–N
4. C–S

A solution of 1% (w/v) starch at pH 6.7 is digested by 15 µg of b-amylase (mol wt 152,000). The rate of maltose (mol wt = 342) had a maximal initial velocity of 8.5 mg formed per min. The turnover number is

1. 0.25 * 105 min–1.
2. 25 * 105 min–1.
3. 2.5 * 105 min–1.
4. 2.5 *104 min–1.

The conformation of a nucleotide in DNA is affected by rotation about how many bonds?

1. 4
2. 6
3. 7
4. 3

Which of the following proteins acts as an energy transducer?

1. G-protein.
2. Bacteriorhodopsin.
3. Hemoglobin.
4. Heat shock protein.

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ARS NET exam model paper

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