[Campbell Biology P.118] The 'DRAW IT' instruction for Figure 5.4 asks to compare the number... | Practice Question

The 'DRAW IT' instruction for Figure 5.4 asks to compare the number of carbons in the ring portions of fructose and glucose. Based on the information provided in the text and figures, how do their ring structures differ regarding the number of atoms in the ring excluding side chains ?

  • A: Glucose forms a six-membered ring containing 5 carbons and 1 oxygen, while fructose forms a five-membered ring containing 4 carbons and 1 oxygen.
  • B: Both glucose and fructose form six-membered rings, but with different arrangements of hydroxyl groups.
  • C: Glucose forms a five-membered ring, while fructose forms a six-membered ring.
  • D: Glucose contains 6 carbons in its ring, while fructose contains 5 carbons in its ring.

Explanation

Figure 5.4 shows glucose forming a six-membered ring 5 carbons and 1 oxygen in the ring . The text in Figure 5.5 b explicitly states that fructose 'forms a five-sided ring'. Looking at the structure of fructose in Figure 5.5 b , its ring contains 4 carbons and 1 oxygen, making it a five-membered ring.