Testing for Biological Molecules
1. This question has 4 part(s).
1.1. Students are presented with an unknown solution which they need to test for the presence of starch, reducing sugar and protein.
(i) Outline the test for reducing sugar.
[3]
(ii) State how students could estimate the concentration of reducing sugar present in the solution.
[1]
1.2. Samples of the original solution are removed and iodine solution is added to one of the samples (A), while biuret reagent is added to the other sample (B). The results of these tests are found in Table 1.
Table 1
Sample | End colour of the solution |
A | Orange-brown |
B | Purple |
Discuss the results obtained for each sample.
1.3. Explain how the test for reducing sugar, outlined in part (a) (i), could be modified to test whether the solution contained sucrose.
1.4. After following the procedure outlined in part (c) the mass of precipitate that formed was heavier than when the test for reducing sugar was performed.
State the significance of these results.
Ai এর মাধ্যমে
১০ লক্ষ+ প্রশ্ন ডাটাবেজ
প্র্যাকটিস এর মাধ্যমে নিজেকে তৈরি করে ফেলো
উত্তর দিবে তোমার বই থেকে ও তোমার মত করে।
সারা দেশের শিক্ষার্থীদের মধ্যে নিজের অবস্থান যাচাই
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