Chapter 3.3 AICE Marine

What is the role of nitrogen in living organisms?

• It is used to make chlorophyll.

• It is used to make amino acids, proteins, and DNA.

• It is used to make bones and shells.

• It is used to make glucose.

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Which element is essential for photosynthesis?

• Calcium

• Phosphorus

• Magnesium

• Nitrogen

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What is a polymer?

• A small molecule that forms part of a larger structure.

• A large molecule made from many repeating smaller sub-units.

• A molecule that breaks down into smaller units.

• A single unit that cannot be broken down further.

What happens during the condensation reaction?

• A molecule of water is added to break a chemical bond.

• Two molecules bond to form a larger molecule with water released as a by-product.

• A molecule of water is removed to form a chemical bond.

• Molecules are broken down into smaller units.

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What are carbohydrates made from?

• Carbon, hydrogen, and nitrogen

• Carbon, hydrogen, and oxygen

• Carbon, nitrogen, and oxygen

• Hydrogen, oxygen, and phosphorus

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Which carbohydrate is used for energy storage in plant and algal cells?

• Cellulose

• Glycogen

• Starch

• Chitin

What is the main structural carbohydrate in plant cell walls?

• Starch

• Glycogen

• Cellulose

• Chitin

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What type of bonds join individual cellulose molecules together?

• Ionic bonds

• Covalent bonds

• Hydrogen bonds

• Peptide bonds

What are triglycerides made from?

• Three fatty acid molecules and a glycerol molecule

• Two fatty acid molecules and a glucose molecule

• Three glucose molecules and a glycerol molecule

• Two glucose molecules and a fatty acid molecule

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What are proteins formed from?

• Fatty acids

• Amino acids

• Nucleic acids

• Carbohydrates

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