7th Grade Unit 2 Review

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, all cells need molecules from food and molecules from air to work properly.

  
  

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

  
  

• Yes, only her stomach cells need food molecules to work properly

  
  

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4. Energy + Carbon Dioxide + Water     ----------->    Glucose + Oxygen                          

The reaction above demonstrates what process?

• 1. Physical change

• 1. Cellular Respiration

• 1. Hydrolysis

• 1. Photosynthesis

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 In which part of a leaf cell does photosynthesis take place?

• 2. Chloroplast

• 1. Nucleus

• 1. Cell wall

• 1. Cell membrane

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 Cellular respiration is an example of a

• Change of state

• Physical Change

• Change in form

• Chemical Change

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The molecules that are the building blocks (monomer) of proteins are

• Glucose

• Nucleic Acids

• Amino Acids

• Carbohydrates

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Which event is an example of a physical change?     

• 1. iron rusting

• 1. fireworks exploding 

• 1. eggs cooking

• 1. ice melting

The energy used to power photosynthesis comes from?

• The Earth

• Glucose

• The Sun

• Oxygen

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 Doctors tested a patient to find out what molecules were in her cells. Her cells contained normal levels of glucose molecules and amino acid molecules, and low levels of oxygen molecules. Will this patient be able to exercise normally?

•  Yes, her body systems are working, but he needs to eat different food; only proteins can react with glucose to release energy.

  
  

• Yes, her body is working properly enough to exercise.

  
  

• No, her digestive system is not breaking down food molecules; her cells need starch molecules to react with glucose, which releases energy. 

  
  

•  No, her respiratory system is not working; her cells need oxygen to react with glucose, which releases energy.

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 The molecule that is the building block for starch/carbohydrates are ____________   

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 In a pond, algae (plant-like organisms) absorb sunlight and the fish eat tadpoles.   These are both examples of how pond organisms.

• 1. Get their energy

• 1. Escape their predators

• 1. Remove wate products

• 1. Produce new offspring.

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