Question

1. an athlete thinks that she can exercise as long as she eats different types of food because her body just needs different types of food molecules to work properly. is the athlete correct?

yes, her cells only work when they have molecules from different types of food.

no, her muscles do not need molecules from food because all cells make all the molecules they need.

no, all cells need molecules from food and molecules from air to work properly.

no, only her stomach cells need food molecules to work properly.

1. the space exploration program has hired you for advice on how to keep astronauts healthy in the space shuttle. how can the programs doctors make sure the astronauts’ bodies work well enough to exercise in space?

the doctors could make sure that the astronauts’ bodies can make enough energy by getting enough sleep.

the doctors could make sure the astronauts’ stomachs are getting the molecules they need from food and air.

the doctors could make sure the astronauts’ cells are getting the molecules they need from food and air.

the doctors could make sure the astronauts’ cells are getting different types of molecules from food.

Explanation:

Question 1

To determine if the athlete is correct, we analyze each option:

• Option 1: Cells don't require molecules from different food types exclusively; they need energy and building blocks from food and oxygen from air. So this is incorrect.
• Option 2: Cells cannot make all molecules they need; they rely on food for nutrients. So this is incorrect.
• Option 3: All cells need molecules from food (for energy, building materials) and molecules from air (oxygen for respiration) to function. This aligns with cellular requirements.
• Option 4: All cells, not just stomach cells, need food molecules. So this is incorrect.

To keep astronauts healthy for exercise in space, we analyze each option:

• Option 1: Sleep is important but doesn't directly provide molecules cells need for energy production (like food and oxygen). So this is incorrect.
• Option 2: It's not just stomach cells; all cells need molecules from food and air. So this is incorrect.
• Option 3: Cells need molecules from food (nutrients) and air (oxygen) to produce energy and function, which is essential for exercise. This is correct.
• Option 4: Cells need molecules from both food and air, not just different food molecules. So this is incorrect.

Answer:

C. No, all cells need molecules from food and molecules from air to work properly.

Question 2