Question

Starch molecules are too large to pass through the tubing into the beaker. Which errors could have caused starch to appear in the beaker despite this fact? Check all possible errors.
not washing the outside of the tubing after filling it with starch

reusing droppers for different solutions

adding glucose to the solution in the dialysis tubing

using a beaker that had not been cleaned thoroughly

Answer 1

Answer here is A,B,D

Everything but C

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Answer 2

Answer:

• not washing the outside of the tubing after filling it with starch
• reusing droppers for different solutions
• using a beaker that had not been cleaned thoroughly

Explanation:

When working in a laboratory, we need to be attentive to the cleaning and asepsis of all equipment so that there is no contamination of the analyzed samples. In case of contamination, the entire research may be compromised and show incorrect results.

An example of this can be seen in the question above, where a tubing and a beaker are used for the separation of molecules. The glucose molecules are too large to pass through the tubing and enter the baeker, however contamination can occur and the baeker contains glucose molecules. This would happen in the following cases:

• not washing the outside of the tubing after filling it with starch
• reusing droppers for different solutions
• using a beaker that had not been cleaned thoroughly