All Questions
Tagged with biochemistry carbohydrates
47
questions
3
votes
1
answer
228
views
Production of ʟ-glucose
What chain(s) of reactions are used to produce ʟ-glucose? I did a search on Google Scholar, but to my surprise nothing came up. My guess would be that the synthesis starts from ᴅ-glucose for which ...
- 133
3
votes
1
answer
89
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Can Molisch test be used to separate monosaccharides from polysaccharides?
Do the results of Molisch test on monosaccharides have any differences with when it's done to disaccharides or polysaccharides?
- 55
3
votes
1
answer
12k
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Why can't amylase digest glycogen?
Amylase is an enzyme that breaks down starch in the form of amylopectin and amylose. Both amylose and amylopectin are formed by alpha glucose joined together by (1-4) and (1-6) glycosidic bonds. ...
- 131
3
votes
1
answer
12k
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Monosaccharides configurations (alpha beta, D L) identification
I am really finding it difficult to identify the correct configuration(s) of a given monosaccharide, in fact my friends and I have been trying to solve this, much to our annoyance.
In one of our ...
- 167
6
votes
4
answers
4k
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Why is fermentation of cellulose to produce biofuel and nutrients so difficult?
The formula for glucose is $\ce{C6H12O6}$ and that of cellulose is very similar $\ce{C6H10O5}$. Glucose can be readily fermented by yeast and other micro-organisms to produce carbon dioxide and ...
- 357
10
votes
1
answer
432
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What is the correct way to notate conformation preferences of polysaccharides?
In some webpages (1 or 2) are found the way to notate the conformational preferences of monosaccharides such as furanose and pyranose.
But, it lacks to give a brief description on how to do it with ...
- 2,600
0
votes
1
answer
705
views
Glycoside Formation Reaction
Whenever we add $\ce{H+}$/ Ethanol to glucose in its hemiacetal form, why doesn't pinacone/pinacolone rearrangement take place in place of nucleophillic substitution. The product would lead to ...
- 1,132
0
votes
1
answer
178
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Asking about definitions of word "sugar" in biochemistry
In a lecture about anabolic pathways of sugar, the lecturer was not clear when stating the name of a multiple sugar carrier & it sounded like "dolichol"so is it correct?
9
votes
3
answers
27k
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How do you recognize a carbohydrate molecule?
I am studying carbohydrates in organic chemistry and I am confused a bit on what they are and how you recognize whether a molecule is a carbohydrate or not. For example, will a carbohydrate always ...
- 1,096
3
votes
2
answers
7k
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If α-glucose is less stable than β-glucose, why is glucose almost always α in its compounds?
Maltose, saccharose, turanose, trehalose, trehalulose, amylopectin, amylose - they are all α. Why? Also, why is cellulose β?
- 1,651
-4
votes
2
answers
17k
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In Glucose, how will you prove the presence of the following? [closed]
One carbonyl group
5 hydroxyl groups
One primary alcholic group
- 99
-2
votes
1
answer
746
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Why isn't sucrose a reducing sugar but maltose is? [duplicate]
I read one of the answers for a similar question, According to that it is due to the hemiacetale group converting into a carbonyl group. I don't get why the same thing can't be applied to sucrose ...
0
votes
1
answer
212
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Why does the AraC arabinose sensing system only respond to the presence of L-arabinose?
I understand that when arabinose is present it interacts with araC and changes it shape, promoting the binding of RNA polymerase with the promoter and GFP is produced. However, I don't understand why ...
- 397
5
votes
1
answer
213
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Polysaccharides from non-cyclic sugars?
I have only come across polysaccharides from monosaccharides that has undergone intramolecular cyclization reaction. I was wondering if it is possible for polysaccharides to form from linear sugars? ...
- 1,697
1
vote
0
answers
148
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If Substance A is more soluble in water than Substance B, will Substance A be more easily absorbed by the body?
I am comparing the solubilities of artificial vs natural sweeteners for my Chemistry IB Internal Assessment. I must demonstrate personal engagement, so I am relating my topic to weight management in ...
- 41