L-lysine is an essential amino acid and must be supplied in the diet. By comparison, the stereoisomer D-lysine is not biologically active. Why can your body only utilize one form?
A. Antibodies recognize the D form and destroy it before your body can use it for nutritional purposes.
B. Since the L form and D form are chiral molecules, they will bind together and inhibit utilization of the D form.
C. Enzymes can only recognize a single, specific stereoisomer.
D. Since the L form and D form are enantiomers, they will bind together and inhibit utilization of the D form.
Answer: C
You might also like to view...
Blood contains
a. dissolved gases. b. dissolved nutrients. c. dissolved hormones. d. all of the above.
Which taxonomic group containing eukaryotic organisms is thought to be directly ancestral to the plant kingdom?
A) golden algae B) apicomplexans C) foraminiferans D) radiolarians E) green algae
In humans, ABO blood types refer to glycoproteins in the membranes of red blood cells. There are three alleles for this autosomal gene: IA, IB, and i
The IA allele codes for the A glycoprotein, The IB allele codes for the B glycoprotein, and the i allele doesn't code for any membrane glycoprotein. IA and IB are codominant, and i is recessive to both IA and IB. People with type A blood have the genotypes IAIA or IAi, people with type B blood are IBIB or IBi, people with type AB blood are IAIB, and people with type O blood are ii. If a woman with type AB blood marries a man with type O blood, which of the following blood types could their children possibly have? A) A and B B) AB and O C) A, B, and O D) A, B, AB, and O
Early Greek philosophers were among the first to:
a. develop a philosophy of a natural world driven by physical laws. b. describe the heavenly bodies as gods or personages. c. explain the world around them according to fixed laws of nature. d. A and C.