Question

1. marisol has been chewing and swallowing her food, but her digestive system is not doing what it usually does. why is this a problem for her ability to exercise?

her cells will not work well because molecules from her food are not being broken down small enough to get to her cells.
her body will run out of energy because molecules from the air are not being combined into larger molecules for the cells.
her respiratory system will have to work twice as hard to break down molecules from food.
her cells will not work well because the molecules from food will be too small for cells to use.

1. doctors tested a patient to find out what molecules were in her cells. her cells contained normal levels of amino acids, normal levels of oxygen molecules, and low levels of glucose molecules. will this patient be able to exercise normally?

yes, her cells just need to combine amino acids to release energy.
no, her cells need to combine glucose into starch molecules to release energy.
no, her cells need glucose to react with oxygen to release energy.
yes, her cells just need oxygen to release energy.

Explanation:

Question 3

To solve this, we analyze each option:

• Option 1: The digestive system breaks down food into small molecules (like glucose, amino acids) for cells. If it's not working, molecules aren't broken down enough to reach cells, so cells can't get nutrients/energy. This makes sense.
• Option 2: Molecules from air (oxygen) are for respiration, not combined into larger molecules for cells. Digestive system deals with food, not air molecules. Eliminate.
• Option 3: Respiratory system's role is gas exchange (oxygen in, CO₂ out), not breaking down food molecules. Digestive system does that. Eliminate.
• Option 4: If food molecules were too small, that would be good (cells can use them), but the problem is digestive system isn't working, so molecules are too big. Eliminate.

Exercise needs energy, which cells get from cellular respiration: glucose + oxygen → energy. Let's analyze:

• Option 1: Amino acids are for building proteins, not releasing energy. Energy comes from glucose/oxygen reaction. Eliminate.
• Option 2: Glucose is broken down (not combined into starch) for energy. Starch is a storage molecule, not used directly for energy in cells. Eliminate.
• Option 3: Cells need glucose to react with oxygen (present in normal levels) to release energy. Low glucose means less energy for exercise. So she can't exercise normally. This is correct.
• Option 4: Oxygen alone isn't enough; glucose is needed for respiration to release energy. Eliminate.

Answer:

The correct option is: Her cells will not work well because molecules from her food are not being broken down small enough to get to her cells.

Question 4