Carbohydrates

[eudovcic]

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From EK: Which of the follow statements are true concerning carbohydrates?

I. Carbohydrates can exist as meso compounds
II. The human body is capable of digesting all isomers of glucose.
III. Glucose is an aldehyde.

I thought the answer would be I and III only, but EK says that it is III only.

Is it really true that ALL carbohydrates cannot exist as meso compounds?

What about a ketotriose:

CH2OH
|
C==O
|
CH2OH

It seems pretty symmetrical to me...

Am I just missing something? I thought I misread the question but it seems pretty straightforward.

 

[onedirection]

Carbs aren't meso

The top carbon is a carbonyl, the bottom isn't

The human body isn't capable of digesting all isomers of glucose, The body only deals with D sugars or something like that and not the L one I think. I know it's the case for amino acids i'm sure it's the same for carbs because it's something with enzyme specificity of our body

Okay I take that back in Amino Acids the L is used, but in Carbs I think the D is still used

And yeah they are aldehydes

 

[monkeyvokes]

From EK: Which of the follow statements are true concerning carbohydrates?

I. Carbohydrates can exist as meso compounds
II. The human body is capable of digesting all isomers of glucose.
III. Glucose is an aldehyde.

I thought the answer would be I and III only, but EK says that it is III only.

Is it really true that ALL carbohydrates cannot exist as meso compounds?

What about a ketotriose:

CH2OH
|
C==O
|
CH2OH

It seems pretty symmetrical to me...

Am I just missing something? I thought I misread the question but it seems pretty straightforward.

the three carbon structure you drew does not have any chiral centers