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Biology
Biological Molecules Quiz 3
Topic 3 Quiz 3
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Category: Biological Molecules Quiz 3
1) The diagram represents a model of enzyme action which terms correctly identify X, Y and Z?
X, is the substrate, changing into Y, the product, at the end of reaction. The enzyme Z, remains unchanged at the end of the reaction.
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2) A plant stem was dissected into a number of different tissues. Each tissue was tested for the presence of starch, protein and reducing sugar. The results are shown in the table Which tissue is Xylem?
Key : Yes = substance present
No = substance absent
Xylem is dead tissue consisting of long, hollow vessels with thick lignified cellulose. wall for the transport of water.
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3) The table shows observations made during tests carried out on samples of particular food. What did the food contain?
What did the food contain?
The result is positive for the presence of starch and proteins, since no reaction occurred during the Benedict’s test. That absence of reducing sugar can be concluded.
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4) Which combination of chemical elements is present in carbohydrate molecules?
Key : Yes = Present
No = Absent
Carbohydrates contain carbon, hydrogen and oxygen. Molecules protein contain carbon, hydrogen, oxygen and nitrogen.
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5) A student carried out four food test on a sample. The results are shown in the table.
What did the sample contain?
The presence of protein turn biuret solution purple in the formation of a green precipitate in a benedict’s test indicates traces amounts of reducing sugar (i.e. glucose). Starch is not present at starch turn iodine blue black and sesame oil is also not present as oil forms a white emulsion in the emulsion test.
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6) The table shows chemical elements present in each of the four substances, Which substance could be a protein?
Key Yes = Present
Protein or organic compound made-up of carbon, hydrogen, oxygen and nitrogen.
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7) 10 grams of starch was mixed with 53 cubic centimeters of enzyme solution. After one hour at 15 degrees Celsius, 2.5 grams was changed to sugar. The experiment was repeated at a temperature of 25 degrees Celsius. How much starch was broken down in the second experiment?
The enzyme action is faster at a higher temperature. Hence, the amount of star digested should be more than 2.5 gram.
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8) A mixture of food gives the following result on testing:
What does the mixture contain?
The presence of protein is confirmed by the purple coloration observed in the biuret tests. The white emulsion is a suspension of tiny oil droplets in the water.
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9) The table shows the protein, fat, and carbohydrate containing 10 grams of rice and whitefish. What would be the main end product of the digestion of a meal of rice and white fish?
Since the main component of the meal are carbohydrate and protein, the main products of digestion are simple sugar and amino acid respectively.
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10) Which food on the table should be given to a patient suffering from anemia?
Anemia results from lack of iron, which is needed for hemoglobin formation. Lentils contain a high amount of iron.
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