Question

all proteins have amino acids as their building blocks. even though there are only 20 amino acids, there are more than a million different proteins, and each works in a unique way. which of the following conclusions about a proteins function is best supported by this information?

○ the amino acids combine in different ways to form proteins with different shapes, and this affects which molecules can bind to it, which in turn directs the proteins function.

○ the amino acids reproduce in different ways, and this allows them to form many different proteins, which in turn directs the proteins function.

○ the shape of a protein determines what amino acids it is made of and what types of reactions it can be used for, which in turn affects the proteins function.

○ the shape of a protein dictates when a protein will break apart into amino acids, which in turn affects the proteins function.

Explanation:

The given information states 20 amino acids form over a million unique proteins with distinct functions. Protein function is determined by its 3D shape, which comes from the unique sequence/arrangement of amino acids. This shape dictates binding ability and function.

• Option 2 is wrong: amino acids do not reproduce.
• Option 3 is wrong: amino acid composition determines protein shape, not the reverse.
• Option 4 is wrong: protein function is not driven by when it breaks down into amino acids.

Only the first option correctly links amino acid arrangement → protein shape → binding → function, matching the given premise.

Answer:

The amino acids combine in different ways to form proteins with different shapes, and this affects which molecules can bind to it, which in turn directs the protein's function.