Question 1

A racemic mixture can rotate a plane-polarized light in a clockwise direction.

Accepted Answer

A) True 
 B)False

Question 2

Shown below is a cyclic form of D-mannose. This structure is classified as ___.

Accepted Answer

A)  $\alpha$-D-mannopyranose 
B)  $\beta$-D-mannofuranose 
C)  $\alpha$-D-mannofuranose 
D)  $\beta$-D-mannopyranose

Question 3

The enzyme ___ in saliva begins the digestion of starch.

Accepted Answer

The answer of The enzyme ___ in saliva begins the...

Question 4

The structural formula for erythrose is drawn here. The carbon atoms are numbered from the carbonyl group.

Accepted Answer

A)  This is the only formula for erythrose; there are no stereoisomers. 
B)  This is both a D and an L structure, as determined by carbons 1 and 2. 
C)  This is D-erythrose, as determined by carbon 3. 
D)  This is L-erythrose, as determined by carbon 4.

Exam 10: Carbohydrates

A racemic mixture can rotate a plane-polarized light in a clockwise direction.

Shown below is a cyclic form of D-mannose. This structure is classified as _. $Shown below is a cyclic form of D-mannose. This structure is classified as _. A) \alpha -D-mannopyranose B) \beta -D-mannofuranose C) \alpha -D-mannofuranose D) \beta -D-mannopyranose$

The enzyme ___ in saliva begins the digestion of starch.

The structural formula for erythrose is drawn here. The carbon atoms are numbered from the carbonyl group.