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Multiple Choice
Proteins serve which of the following functions in living organisms?
A
Storing genetic information
B
Providing a primary source of energy
C
Forming the phospholipid bilayer of cell membranes
D
Catalyzing biochemical reactions as enzymes
Verified step by step guidance
1
Understand the role of proteins in living organisms. Proteins are macromolecules made up of amino acids and serve diverse functions, including structural support, transport, signaling, and catalysis of biochemical reactions.
Recognize that storing genetic information is the function of nucleic acids, such as DNA and RNA, not proteins. Proteins do not directly store genetic information.
Identify that providing a primary source of energy is the role of carbohydrates and lipids, not proteins. While proteins can be metabolized for energy in extreme cases, this is not their primary function.
Understand that forming the phospholipid bilayer of cell membranes is the role of lipids, specifically phospholipids, not proteins. Proteins may be embedded in the membrane but do not form the bilayer itself.
Learn that catalyzing biochemical reactions is a key function of proteins when they act as enzymes. Enzymes are specialized proteins that speed up chemical reactions by lowering the activation energy required for the reaction to occur.