Which of the following statements is correct? A) There are 20 essential amino acids for humans B) The amino acid with which protein synthesis begins is always arginine C) All amino acids have polar side chains D) All amino acids have an asymmetric carbon atom E) The amino acids cysteine and methionine contain a sulfur atom
Question
Which of the following statements is correct? A) There are 20 essential amino acids for humans B) The amino acid with which protein synthesis begins is always arginine C) All amino acids have polar side chains D) All amino acids have an asymmetric carbon atom E) The amino acids cysteine and methionine contain a sulfur atom
Solution
The correct statement is:
E) The amino acids cysteine and methionine contain a sulfur atom
Explanation:
A) There are 20 amino acids that are essential for humans, but not all of them are produced by the human body. There are 9 that the body cannot produce and must be obtained from the diet.
B) The amino acid with which protein synthesis begins is always Methionine, not Arginine.
C) Not all amino acids have polar side chains. Some have nonpolar side chains.
D) While most amino acids do have an asymmetric carbon atom, there is one that does not: Glycine.
E) Both cysteine and methionine are amino acids that contain a sulfur atom, making this statement correct.
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