question_answer 20)

  Which of the following sugars have the same number of carbon as present in glucose? (a) Fructose                        (b) Erythrose     (c) Ribulose                        (d) Ribose

Answer:

                    (a) Fructose is a ketohexose. Its carbon is attached to an hydrogen atom by a singlebond and to an oxygen atom by a double bond. Erythrose is atetrose carbohydrate Its a part of tetrose family and possesses one aldehyde group. Ribulose is aketopentose, containing five carbon atoms and Includes 'ketone' as afunctional group. Ribose is a pentose which is a major component of DNA and RNA.