[bioiskillingme]

...that I keep having trouble with! Could anyone help me with these? I keep getting these wrong and getting partial credit...would love full credit by the time I finish this homework. Thank you so much!!

1) What element is not used to classify carbohydrates?
A) Insaturations in the carbon backbone
B) # of carbons
C) The presence of isomers
D) The presence of aldehyde or ketone groups in the C1 or C2
I chose B and C and got it wrong...

2) In this question there are several correct answers...What are the properties of carbohydrates?
a) Are polyalcohols but contain a carbonyl group       
b) Contain only C, H and O   
c) Can be synthesized with water and carbon       
d) Monosaccharydes contains between 4-9 carbons     
e) Can produce polysaccharydes by glycosidic bonds     
f) The carbon backbone is saturated   
I chose b, d, e.

3) The cellulose is a [-----] non [-----] composed by [-----] linked by [-----]. That make possible that cellulose adopts a [-----] structure that is [-----] by a lot of hydrogen bonds.
Fill in with [linear], [polysaccharide], [beta-D-glucose], [beta 1-4 bonds], [branched], [stabilized].

[Dan]

Can you explain why you chose the answers you chose? Perhaps add a little comment by each option, saying why you did or did not choose that option.

I sympathise with you. These questions are very poorly written.

Q1: What is meant by classify? I would argue that all of those are used to classify carbohydrates.

Q2: This one's ok. Explain your choices.

Q3. This is not written in correct English, so it is quite difficult to fill in. If I translate it for you it should be easier:

3) Cellulose is a non [-----] [-----] composed of [-----] units linked by [-----]. This allows cellulose to adopt a [-----] structure that is [-----] by a lot of hydrogen bonds.
Fill in with [linear], [polysaccharide], [beta-D-glucose], [beta 1-4 bonds], [branched], [stabilized]

[bioiskillingme]

How would you fill in number 3?

[Dan]

You try it first, then we can see where you're going wrong - you'll learn more that way.

[bioiskillingme]

I ended up with: The cellulose is a [polysaccharide] non [branched] composed by [beta-D-glucose] linked by [beta 1-4 bonds]. That make possible that cellulose adopts a [linear] structure that is [stabilized] by a lot of hydrogen bonds.

It was right! My professor isn't a native English speaker which makes deciphering his homework extremely difficult.

[Dan]

Good.

What about the others, can you explain your choices?