4.1.diffusion2

1. Glucose indicator was added to a beaker of an unknown liquid. Starch indicator was added to a different beaker containing the same unknown liquid. The color of the indicator solutions before they were added to the beakers and the color of the contents of the beakers after adding the indicator solution are recorded in the chart below.

Which carbohydrate is present in the unknown liquid?

The presence of starch indicator in the beaker containing the unknown liquid indicates the presence of starch in the liquid. The fact that the glucose indicator did not change color suggests that glucose is not present in the liquid. Therefore, the carbohydrate present in the unknown liquid is starch.

Explanation

The presence of starch indicator in the beaker containing the unknown liquid indicates the presence of starch in the liquid. The fact that the glucose indicator did not change color suggests that glucose is not present in the liquid. Therefore, the carbohydrate present in the unknown liquid is starch.

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2. If frog eggs taken from a freshwater pond are placed in a saltwater aquarium, what will most likely happen?

Water will leave the eggs.

Salt will leave the eggs.

Water will neither enter nor leave the eggs.

The eggs will burst.

When frog eggs are placed in a saltwater aquarium, the concentration of salt in the surrounding water is higher than that in the eggs. This creates a concentration gradient, causing water to move out of the eggs through osmosis. As a result, the eggs will lose water and shrink. Therefore, the most likely to happen is that water will leave the eggs.

Explanation

When frog eggs are placed in a saltwater aquarium, the concentration of salt in the surrounding water is higher than that in the eggs. This creates a concentration gradient, causing water to move out of the eggs through osmosis. As a result, the eggs will lose water and shrink. Therefore, the most likely to happen is that water will leave the eggs.

3. Part of a laboratory procedure is shown in the diagram below.

This setup would most likely be involved in a procedure to

Stain specimens while making a wet mount

Test for the presence of glucose using an indicator

Separate pigments in a mixture

Determine the pH of solutions

The setup shown in the diagram consists of a test tube containing a solution and a test strip or indicator. This setup is commonly used to test for the presence of glucose using an indicator. The indicator will change color in the presence of glucose, allowing the experimenter to determine if glucose is present in the solution. This setup is not typically used for staining specimens, separating pigments, or determining pH.

Explanation

The setup shown in the diagram consists of a test tube containing a solution and a test strip or indicator. This setup is commonly used to test for the presence of glucose using an indicator. The indicator will change color in the presence of glucose, allowing the experimenter to determine if glucose is present in the solution. This setup is not typically used for staining specimens, separating pigments, or determining pH.

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5. Base your answers to this question on the experimental setup shown below. State one reason why some molecules can pass through a certain membrane, but other molecules can not.

Some molecules cannot pass through a certain membrane because they are too big or too large in size. The size of the molecules determines their ability to pass through the membrane.

Explanation

Some molecules cannot pass through a certain membrane because they are too big or too large in size. The size of the molecules determines their ability to pass through the membrane.

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6. Base your answers to this question on the experimental setup shown below. When starch indicator is used, what observation would indicate the presence of starch?

The presence of starch can be indicated by a color change in the solution. Specifically, if the color changes to purple or blue-black, it suggests the presence of starch.

Explanation

The presence of starch can be indicated by a color change in the solution. Specifically, if the color changes to purple or blue-black, it suggests the presence of starch.

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7. A laboratory setup of a model cell is shown in the diagram below.