Question

Glucose molecules bond together in a process known as dehydration synthesis. What happens in this process?

Water is used as a reactant in order to build the polysaccharide molecule.

A water molecule is formed from the hydrogen and oxygen atoms removed.

The reaction uses water molecules to break the bonds in each glucose.

Water molecules are removed from each glucose molecule by the addition of heat.

Is it the third one? @Compassionate

Answer 1

dehydration is referring to loss of H\(_2\)O, or in other words, Water.

Answer 2

I'm confused... so no?

Answer 3

Your answer is NOT the third one. Can I ask, what class is this for? Biochemistry, Organic Chemistry, or general biology?

Answer 4

General Biology.

Answer 5

10th grade.

Answer 6

Oh. Well, I guess I cannot go too into detail then. But, eitherway, you're losing an \(\sf \color{red}{-OH}\) group from the glucose molecule. But, in order to lose that OH, you must form first form: OH\(_2\), which is water. And that is a dehydration reaction. The loss of a \(\sf \color{red}{-OH}\) as water.

Answer 7

Okay, then my next guess is the last one.

Answer 8

No. It's B.

Answer 9

-OH is a very tough to break off from a molecule, and hence it needs to become water before it leaves. So you need to form water 1\(^{st}\) then it leaves.

Answer 10

Oh. I'm not too good at this. But thank you.

Answer 11

Yeah. That's a tricky question for 10\(^{th}\) grade biology without knowing some basic organic chemistry.

Answer 12

@abb0t is right. To put a bit of biology context, all the macromoecules undergo some kind of dehydration synthesis (chemically bond two monomers and release water). The reverse process is called hyrdolysis (put in water to break up a chemical bond between two monomers). In other words B is describing dehydration reaction and C is describing hydolysis. A does not happen in cells (to my knowledge) and D is incorrect because heat is not needed for this reaction to take place.