Tutorial Practice Questions - Week 6

Question 1

Haworth projection formulas

a) are representations of the cyclic form of sugars

b) can show the distinction between the alpha and beta anomers

c) both of the above

d) neither of the above

Answer 1

c)

Question 2

Which of the following monosaccharides is a ketose?

a) glucose

b) fructose

c) galactose

d) mannose

Answer 2

b)

Question 3

A hemiacetal is a cyclic structure of a ketose. Why?

True

False

Answer 3

False - A hemiacetal is a cyclised aldose structure; a hemiketal is a cyclised ketose.

Question 4

In the open-chain form of a sugar, which carbon becomes the anomeric carbon in the cyclic form?

a) the carbonyl carbon

b) the highest numbered chiral centre

c) the highest numbered carbon

d) it depends on the individual sugar

Answer 4

a)

Question 5

A furanose is a sugar that contains a five-membered ring as part of its cyclic structure.

True

False

Answer 5

True

Question 6

The alpha and beta forms of the same sugar are called

a) epimers

b) diastereoisomers

c) enatiomers

d) anomers

Answer 6

d)

Question 7

Glycosidic linkages between monosaccharide units may vary based on

a) the anomeric form of the cyclic structure, that is the alpha or beta

b) which -OH group is involved

c) both of the above

d) none of the above

Answer 7

c)