Question

Select all the monosaccharides that are correctly paired with their class.

a) Glyceraldehyde - ketotriose
b) Ribose - aldotetrose
c) Ribulose - ketopentose
d) Glucose - aldohexose
e) Mannose - ketohexose
f) Nictos - aldohexose
g) Gialactose - aldohexose

Answer 1

The correct pairs of monosaccharides with their class are a) Glyceraldehyde - ketotriose, d) Glucose - aldohexose, e) Mannose - ketohexose, and g) Galactose - aldohexose

Step-by-step explanation:

Monosaccharides are classified based on the position of the carbonyl group and the number of carbons in the backbone. Aldoses have a carbonyl group at the end of the carbon chain, and ketoses have a carbonyl group in the middle of the carbon chain. Trioses, pentoses, and hexoses have three, five, and six carbon backbones, respectively.

Therefore, correct pairings should have an aldehyde group for aldoses or a ketone group for ketoses, and the number of carbons in the backbone that matches the class name. Therefore the correct pairs of monosaccharides with their class are: a) Glyceraldehyde - ketotriose, d) Glucose - aldohexose, e) Mannose - ketohexose, and g) Galactose - aldohexose

Answer 2

The correct pairs of monosaccharides and their respective classes are:

• d) Glucose - aldohexose
• g) Galactose - aldohexose

Step-by-step explanation:

Glucose is correctly paired as an aldohexose, and galactose is also an aldohexose. Monosaccharides are classified based on the number of carbon atoms they contain and whether they form an aldehyde (aldose) or a ketone (ketose) functional group. Glucose and galactose both have six carbon atoms, making them hexoses. Additionally, they possess an aldehyde functional group, categorizing them as aldohexoses.

Glyceraldehyde is a triose, not a ketotriose, while ribose is an a.l.do.p.e.n.t.o.s.e, not an aldotetrose. Ribulose is a ketopentose, but it's not correctly paired with its class as stated. Mannose is an aldohexose, not a ketohexose, and Nictos is not a recognized monosaccharide.

Therefore, the correct pairs are:

• d) Glucose - aldohexose
• g) Galactose - aldohexose