Macromolecules

Lipids and carbohydrates are two important groups in all living organisms and are made of combinations of carbon, hydrogen, and oxygen. Which structure is a lipid?

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Scientists examine the structure of an organic molecule and identify phosphate groups, sugar molecules, and nitrogenous bases. Which molecule were they examining?

• carbohydrate

• lipid

• nucleic acid

• protein

What relationship exists between amino acids and proteins?

• Proteins and amino acids bond to form lipids.

• Amino acids are larger molecules than proteins.

• Proteins are made up of amino acids.

• Amino acids form when proteins bond together.

  Amino acids form when proteins bond together.

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Which statement is true about nucleic acids?

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• They are found only in the nucleus of cells.

• They serve as the subunits of proteins.

• They are composed of sugar, glycerol, and nitrogen bases.

• They store and transmit genetic information.

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• Carbohydrates

• Lipids

• Nucleic Acids

• Proteins

What causes a duck's feathers to repel water?

• A type of protein called an enzyme is secreted which forms a coating on the feathers.

• A type of lipid called an enzyme is secreted which forms a coating on the feathers.

• A type of protein called an oil is secreted which forms a coating on the feathers.

• A type of lipid called an oil is secreted which forms a coating on the feathers.

  A type of lipid called an oil is secreted which forms a coating on the feathers.

Which organic molecule carries the hereditary information for cells?

• carbohydrate

• lipid

• nucleic acid

• protein

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which situation would most likely occur if all the ribosomes in a cell were destroyed?

• Mutations would begin to occur in the cellular DNA.

• The cell would no longer synthesize chains of amino acids.

• Protein and lipid absorption would increase.

• The cell would no longer be able to convert glucose into ATP.

  The cell would no longer be able to convert glucose into ATP.

• The molecule is a long chain composed of smaller units; therefore, it must be a chain of fatty acids.

• The molecule contains four different nitrogen bases; therefore, it must be RNA.

• The molecule contains the nitrogen base thymine; therefore, it must be DNA.

• The molecule is composed of sugars and phosphates; therefore, it must be a molecule of ATP.

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NGSS.HS-LS1-1

• DNA

• polysaccharide

• protein

• RNA

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