Determine if each statement is true or false and fill in the blank with true or

Question

Determine if each statement is true or false and fill in the blank with true or False. All D-sugars are dextrotatory. Naturally occurring monosaccharides are typically D-sugars and naturally occurring amino-acids are typically L-amino-acids. Alpha linked polymers of glucose are good energy storage materials. Amyl pectin and glycogen vary only in the distance between branches. Humans can generally break down alpha-linked oligosaccharides of glucose. Ketoses do not mutarotate and are not able to be reducing sugars. Monosaccharides only react as alcohols due to formations of hemiacetals. All unmodified disaccharides are reducing sugars. OH to the right in Fischer Projections of monosaccharides are indicative of R stereocenters It is possible to selectively break or form ethers at the anomeric carbon of a cyclic monosaccharide. Cleavage of acetals in acid can convert a non-reducing sugar to a reducing sugar. Carbohydrates are used as structural materials, signalling molecules, cell identifiers, energy storage, and catalysts in living systems.

Explanation / Answer

1. False - All D - sugars are dextrorotatory - They are naturally occurring sugars in the body

2. True - All naturally occurring sugars are D- sugars and all amino acids are L-amino acids.

3. True - All alpha linked polymers of glucose are good energy source - Example of energy storage materials are starch, glycogen and cellulose.

4. True - Amylo pectin and glycogen vary only with distance between branches - Glycogen has more branches than amylo pectin.

5. True - Humans can generally break alpha linked glucose oligosaccharides - They do not have enzyme to break beta linkages as in cellulose.

6. True - Ketoses does not mutarotate and are not reducing sugars - They do not react with Tollens reagent.

7. False - Hemiacetals do react if the functional carbon group is free.

8. False - Sucrose is an unmodified non reducing sugar

9. True - OH to the right in monosaccharides are indicative of R sterocenters.

10. True - Selective breakage can occur using enzymes

11. True - acid hydrolysis will convert non reducing sugar to reducing sugar

12. True - These are functions of carbohydrate molecules.

Related Questions

Navigate

• Browse (All)
• Browse D
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.