Biochemistry - Classification of Monosaccharides

In terms of carbon atoms, __ ?___ are the smallest monosaccharides that can exist. a. trioses b. tetroses c. pentoses d. None of the above

A. Trioses

These type (s) of monosaccharides are important energy sources for the human body. a. D monosaccharides b. L monosaccharides c. Both a and b

A . D monosacharrides

Thus D and L forms are for hydroxyacetone. True or False?

False . it should be Dihydroxyacetone

-It is a monosaccharide that contains an ketones functional group, and are polyhydroxy ketones.

Ketose

Monosaccharides are also often called sugars. true or false?

True.

What are the two triose structures that serve as the reference points for consideration of the structures of aldoses and ketoses that contain more carbon atoms?

aldose (glyceraldehyde) ketose (dihydroxyacetone).

A three-carbon monosaccharide is called?

Triose

A major difference between glyceraldehyde and dihydroxyacetone is that the latter does not possess a chiral carbon atom. true or false

True

All monosaccharides have names that end in -ose except the trioses glyceraldehyde and dihydroxyacetone. True or False?

True

The number of possible aldoses doubles each time an additional carbon atom is added because the new carbon atom is a chiral center. true or false?

True

The term saccharide comes from the Latin word for "sugar," which is saccharum. true or false?

True

Those that contain four, five, and six carbon atoms are called?

tetroses, pentoses, and hexoses

How many chiral centers? Glyceraldehyde has __?__ chiral center. Tetroses __?__ chiral centers. Pentoses __?__ chiral centers. Hexoses __?__ chiral centers. a. 1 , 2 , 3 , 4 b. 1 , 4 , 5 , 6 c. no correct response

A. 1 , 2 , 3 ,4

Which of the following statements about monosaccharides is correct? a. Aldopentoses contain more chiral centers than ketopentoses. b. Ketopentoses contain more chiral centers than aldopentoses. c. Aldopentoses and ketopentoses contain the same number of chiral centers d. no correct response

A. Aldopentoses contain more chiral centers than ketopentoses.

-It is a monosaccharide that contains an aldehyde functional group, and are polyhydroxy aldehydes.

Aldose

Type of monosaccharides, which can be produced in the laboratory, cannot be used by the body as energy sources. a. D monosaccharides b. L monosaccharides c. Both a and b

B. L monosaccharides

Which of the following statements about monosaccharides is correct? a. Aldopentoses contain more carbon atoms than ketopentoses. b. Ketopentoses contain more carbon atoms than aldopentoses. c. Aldopentoses and ketopentoses contain the same number of carbon atoms. d. no correct response

C. Aldopentoses and ketopentoses contain the same number of carbon atoms. (AldoPENTOSES , ketoPENTOSES , same 5 number)