A branch of glycogen is a chain of 40 glucose units…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A branch of glycogen is a chain of glucose units. Each glucose has a mass of . When two units join, a molecule of water of mass leaves.
- How many joins are there in the chain?
- What mass of water is released in all?
- What is the mass of the chain?
Need a reminder? The key ideaShow
Sucrose is glucose and fructose, lactose is glucose and galactose, maltose is two glucose units. Starch, glycogen and cellulose are chains of glucose; inulin is fructose; chitin is an amino sugar. Starch with iodine is blue. A saturated fatty acid with c carbons is C(c) H(2c) O2, and each double bond removes two hydrogens. With atomic masses C 12, H 1, O 16, palmitic acid is 256 Da. Fats and oils are glycerides; lecithin is a phospholipid. Joining units releases one water at each join.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Joins. .
Step 2. Water. .
Step 3. Chain. for the units. Then .
Answer: ; ; .
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