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Most types of molecule in the cell have asymmetric (chiral) carbons. Consequentl

ID: 24572 • Letter: M

Question

Most types of molecule 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 isomer are called stereoisomers. Which of the four carbons circled in Figure Q2-33 is the asymmetric carbon that determines whether the amino acid (threonine in this case) is a D- or an L- stereoisomer?

Figure Q2-33 can be found here:

http://tinypic.com/r/2ldenw1/6

Explanation / Answer

1 & 4

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