Most Types of Molecules in the Cell Have Asymmetric (Chiral)

Multiple Choice

Most types of molecules in the cell have asymmetric (chiral) carbons.Consequently there is the potential to have two different molecules that look much the same but are mirror images of each other and therefore not equivalent.These special types of isomers are called stereoisomers.Which of the four carbons circled in Figure 2-37 is the asymmetric carbon that determines whether the amino acid (threonine in this case) is a ᴅ or an ʟ stereoisomer? Figure 2-37

A) 1
B) 2
C) 3
D) 4