Biology EOC Practice Biochemistry

Waxes create a waterproof layer on the outside of some living organisms. To which group of organic molecules do waxes belong?

• proteins

• nucleic acids

• lipids

• carbohydrates

Salivary amylase is an enzyme in humans that breaks down starches. What substance would humans have difficulty digesting without this enzyme?

• lipids

• carbohydrates

• proteins

• nucleic acids

Which best explains why the rate of a biochemical reaction decreases at high temperatures?

• The activation energy increases.

• The shape of the enzyme changes.

• The enzyme-substrate complex forms.

• The bonds between substrates are broken.

Which molecules are joined together to make proteins?

• acetic acids

• amino acids

• nucleic acids

• fatty acids

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What type of organic molecules are enzymes?

• proteins

• nucleic acids

• lipids

• carbohydrates

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What are the subunits of DNA and their function?

• proteins that provide the building blocks for the structural components of organisms

• lipids that store energy and provide insulation

• monosaccharides that provide quick energy for the cell

• nucleotides that store information

Which type of molecule do whales use for energy storage and insulation?

• starch

• fat

• glucose

• DNA

Which most directly controls the rate at which food is broken down to release energy?

• enzymes

• hormones

• nucleic acids

• vitamins

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Which factor most affects the order of amino acids in a protein?

• the DNA located in the nucleus of the cell

• the cell in which the protein is located

• the amount of ATP available for the cell’s use

• the area in a cell where proteins are produced

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