Food, Energy, and Chemical Reactions

Which of the following best describes the role of enzymes in the digestive system?

• Enzymes store energy for later use.

• Enzymes speed up chemical reactions to break down food.

• Enzymes transport nutrients throughout the body.

• Enzymes convert food into waste products.

What is the primary function of the digestive system?

• To circulate blood throughout the body.

• To break down food into molecules small enough to be absorbed.

• To produce hormones for growth.

• To protect the body from infections.

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NGSS.MS-LS1-7

Which of the following is a product of cellular respiration?

• Oxygen

• Glucose

• Carbon dioxide

• Starch

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NGSS.MS-LS2-3

During cellular respiration, glucose is converted into which of the following?

• Water and oxygen

• Energy, carbon dioxide, and water

• Proteins and fats

• Vitamins and minerals

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NGSS.MS-LS1-7

Which nutrient is primarily broken down to produce glucose?

• Proteins

• Fats

• Carbohydrates

• Vitamins

What is the main purpose of metabolism in organisms?

• To store genetic information

• To convert food into energy and build molecules

• To transport oxygen in the blood

• To protect against diseases

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NGSS.MS-LS1-2

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Which of the following best describes a chemical reaction?

• A process that involves rearranging the molecular structure of a substance.

• A process that involves mixing substances without changing their properties.

• A process that involves freezing and melting substances.

• A process that involves dissolving substances in water.

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NGSS.MS-PS1-1

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How does the body use the energy released from cellular respiration?

• To produce waste products

• To build and repair tissues

• To store fat

• To produce vitamins

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NGSS.MS-LS1-7

Which of the following molecules is a primary source of energy for cells?

• Starch

• Glucose

• Cellulose

• Glycogen

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NGSS.MS-LS1-6

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What happens to food molecules during digestion?

• They are converted into waste products immediately.

• They are broken down into smaller molecules that can be absorbed.

• They are stored in the stomach for future use.

• They are turned into enzymes.

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NGSS.MS-LS1-7