Question

how are amino acids related to a proteins function?
a. a proteins function is based on its shape, which is dependent on its amino acid sequence.
b. the amino acid sequence of a protein will change to meet functional needs as necessary.
c. a proteins function depends on whether it is made up of amino acids or nucleotides.
d. amino acid sequences of all proteins are the same, while a proteins function is based on how it folds.

Explanation:

Proteins are made of amino acids. The sequence of amino acids determines the protein's shape through processes like folding. A protein's function is closely related to its shape. For example, enzymes (a type of protein) have specific shapes that allow them to bind to substrates. If the amino - acid sequence changes (a mutation), the shape can change, and so can the function. Option A correctly states that a protein's function is based on its shape (which is determined by the amino - acid sequence). Option B is incorrect because the amino - acid sequence is determined by genetic information (DNA) and does not change to meet functional needs in the way described. Option C is wrong because proteins are always made of amino acids (nucleotides make up nucleic acids like DNA and RNA). Option D has the cause - effect reversed; the amino - acid sequence determines how a protein folds (shapes), and thus the function.

Answer:

A. A protein's function is based on its shape, which is dependent on its amino acid sequence.