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File : THESIS.pdf - Universitas Muhammadiyah Malang

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3. Samples of a food were tested using Benedict’s reagent, biuret solution and ethanol.<br />

After testing, the solutions were blue with Benedict’s reagent, purple with biuret<br />

and cloudy with ethanol.<br />

Which molecules do the samples contain?<br />

A. W, X and Z<br />

B. W, Y and Z<br />

C. W, X and Y<br />

D. X, Y and Z<br />

4. How is the shape of a polypeptide chain maintained when it is coiled into an αhelix?<br />

A. disulphide bonds<br />

B. hydrogen bonds<br />

C. hydrophobic interactions<br />

D. ionic bonds<br />

191

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