Assignment:
Q1. Indicate the number of possible stereoisomers for a linear aldopentose?
a.4
b.8
c.12
d.16
Q2. What statement in incorrect about the following pairs of sugars?
a. Galactose and mannose are diastereomers
b. L-galactose and D-galactose are enantiomers
c. Glyceraldehyde and dihydroxyactone are stereisomers
d. Gulcose has more chirl carbons than fructose
Q3. Which of the following sugars is classified as a ketose?
a. Galactose
b. Mannose
c. Fructose
d. Erythose
Q4. What disaccharide contains this molecule as a component?
a. Maltose
b. Celloboise
c. Lactose
d. Sucrose
Q5. Which of the following molecules cannot undergo mutarotation?
a. Glucose
b. Erythrose
c. Fructose
d. Ribose
Q6. Which of the following is a characteristic of sugar alcohols?
a. Can be prepared by the mild oxidation of an aldose.
b. Can spontaneously form intramolecular hemiacetals
c. Are classified as alditols
d. Two of the above
Q7. Which of the functions listed below is not a primary function for polysaccharides?
a. Structual components
b. Engery storage molecules
c. Protective substances
d. Hormone receptors
Q8. Which molecule is not a glycosaminoglycan?
a. Heprin
b. Chondroitin-4-sulfate
c. Keratan sulfate
d. Chitin
Q9. Which of the following molecules is not amphipatic?
a. Cholesterol
b. Succinate
c. Oleic acid
d. Phosphatidylcholine
Q10. Which is a property of cholesterol esters and triacylglcerols?
a. They are more polar than phosphatidylcholine
b. They can be classified as amphipathic molecules
c. They are components of plasma membranes
d. They are carried in serum as complexes with proteins
Q11. Which of the following features is not found in a triacylglyceride, such as trimyristoylglycerol?
a. The molecule contains a chirl carbon
b. Insoluble in water
c. Soluable in organic solvent, such as benzene
d. Found primarily in adipose tissue
Q12. The reaction of a fatty acid with cholesterol produces what type of linkage and at what ring position in cholesterol?
a. Amide, aC-15
b. Ester, atC-3
c. Thiol ester, at C-26
d. Ester, at C-19
Q13. Which molecule or class of molecules is not derived from cholesterol?
a. Prostaglandins
b. Aldosterone
c. Glucocorticoids
d. Cholic acid
Q14. Which of the following statements is incorrect about glycerophospholipids isolated from erythrocyte membrane?
a. The net charge on phosphatidylchlorine is more postive than on phosphatidyl serine at pH7.0
b. They are amphiapathic molecules.
c. All the phosphatidylcholine molecules have the same molecular weight.
d. These lipids include phosphatidylcholine, phosphatidylserine,phosphatidylinositol, and phosphatidylethanolarnine.
Q15. Acid hydrolysis will break all ester, amide and acetal chemical linkage, which is not true about acid hydrolysis of various lipids?
a. A cerebroside will release two fatty acids and one monosaccharide per mole of cerebroside.
b. Phosphatidyl choline will release two fatty acids and one glycerol molecule per molecule of phosphatidylcholine.
c. Cerebrosides and sphingomyelin will release one mole of sphingosine.