This set of Biochemistry Multiple Choice Questions & Answers (MCQs) focuses on “Monosaccharides and Disaccharides”.
1. Anthrone method is preferred in the determination of
Explanation: Carbohydrates are dehydrated with con.H2SO4 to form Furfural, which condenses with anthrone to form a green color.
2. Which of the following are an example of epimers?
a) Glucose & Galactose
b) Glucose & Ribose
c) Mannose & Glucose
d) a & c
Explanation: Both glucose and galactose have the same chemical formula but the orientation of –OH group on C4 molecule in both the compounds are different.
3. One of the following has reducing properties
a) Glucuronic acid
b) Gluconic acid
c) Glucaric acid
d) Mucic acid
Explanation: Glucuronic acid has free aldehyde group which is responsible for its reducing property.
4. The red precipitate formed when glucose is heated with “Benedict’s reagent” is
a) Cupric hydroxide
b) Cuprous hydroxide
c) Cupric oxide
d) Cuprous oxide
Explanation: When reducing sugars are heated in the presence of an alkali and reduce the Cupric compounds present in the Benedict’s reagent to cuprous compounds which get precipitated as insoluble red Cu2O.
5. Fructose and Glucose can be distinguished by
a) Selwinoff’s reagent
b) Benedict’s reagent
c) Fehling’s reagent
d) Barfoed’s reagent
Explanation: Selwinoff’s reagent gives positive test for fructose.
6. Which of the following is an example of monosaccharide?
Explanation: Galactose is a simple sugar which consists of a single polyhydroxy aldehyde.
7. Which of the following is an example of disaccharide?
Explanation: Maltose is a disaccharide with two monosaccharide glucose units.
8. In maltose, between which of the following carbons there is a linkage?
a) C1, C2
b) C2, C3
c) C1, C4
d) C2, C4
Explanation: Maltose contains two D-glucose residues joined by a glycosidic linkage between C1 of one glucose residue and C4 of the other.
9. Which of the following carbohydrates is a triose?
Explanation: Glyceraldehyde is a triose containing 3 carbons.
10. Lactose is a disaccharide of which of the following sugar units?
a) Glucose and fructose
b) Glucose and galactose
c) Glucose and sucrose
d) Glucose and ribose
Explanation: Lactose is a disaccharide of glucose and galactose.
Sanfoundry Global Education & Learning Series – Biochemistry.
To practice all areas of Biochemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.