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Deffense [45]
3 years ago
7

Your lab group is experimenting with the diffusion of molecules across a membrane. Dialysis tubing is used as a model cell membr

ane, because is it semi-permeable, allowing small molecules to cross the membrane, but NOT larger molecules, like starch. A starch solution is placed in the dialysis tubing and then the dialysis tubing is placed in an iodine and water solution. Iodine is used as an indicator for the presence of starch. Normally, iodine is a yellow-brown color, but in the presence of starch, it turns a deep purple. After observing the experimental setup for 20 minutes, the iodine solution remains brown, but the starch solution inside the dialysis tubing is purple and swollen. Based on what you learned from the lab, starch is MOST likely to cross the cell membrane at which of the points indicated on the diagram? A) Starch crosses the cell membrane at A. B) Starch crosses the cell membrane at B. C) Starch crosses the cell membrane at D. D) Starch crosses the cell membrane at E.
Biology
2 answers:
zaharov [31]3 years ago
6 0

Answer:

C) Starch requires ATP energy for transport and therefore cannot cross the dialysis tubing into the iodine solution.

Explanation:

I did the USAtestprep

katovenus [111]3 years ago
5 0

Answer:

Starch crosses the cell membrane at E.

Explanation:

i did the USATestprep

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3 years ago
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2 years ago
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3 years ago
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natita [175]

Answer:

1) A

2) Could be A, B,  or D

Explanation:

1)   Prokaryote is a single celled organism that has no distinct nucleus, membrane  - bound organelles, and specialized organelles (such as the mitochondria).

This definition would only match A) a bacteria cell because all the other cells are called Eukaryotas (which are more complex and have membrane - bound organelles).

2) The answer could be A because Prokaryotic cells lack membrane bound organelles

The answer could be B because the diagram has labeled the cell membrane as "plasma membrane"

The answer could NOT be C because Prokaryotic cells do not have nucleus's, but have free floating DNA.

The answer could be D because it is the only image that has a flagellum (which helps the cell move)

I am sorry I couldn't answer this question completely, but I think that this question has flaws.

Hope this helps! Let me know if you have any other questions!

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3 years ago
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Answer:

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