The diagram illustrates schematically the current model of muscle contraction - HSC - SSCE Chemistry - Question 36 - 2012 - Paper 1
Question 36
The diagram illustrates schematically the current model of muscle contraction.
Name protein X, protein Y and metal ion Z.
(b)
(i) Provide the general formula for... show full transcript
Worked Solution & Example Answer:The diagram illustrates schematically the current model of muscle contraction - HSC - SSCE Chemistry - Question 36 - 2012 - Paper 1
Step 1
Name protein X, protein Y and metal ion Z.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Protein X is identified as myosin, protein Y is actin, and metal ion Z is calcium.
Step 2
Provide the general formula for a fatty acid.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The general formula for a fatty acid is CnH2nO2, where n is typically between 4 and 24.
Step 3
Provide the structural formula for glycerol.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The structural formula for glycerol is:
HOCH2-CHOH-CHO
This indicates that glycerol is a triol with three hydroxyl (-OH) groups.
Step 4
Account for the difference in the aqueous solubility of glycerol compared to that of fatty acids and triacylglycerols (TAGs).
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Glycerol is more soluble in water than fatty acids and TAGs due to its three hydroxyl groups, which can form hydrogen bonds with water. In contrast, fatty acids have long hydrophobic hydrocarbon chains that limit their solubility. TAGs, composed of fatty acids and glycerol, exhibit similar nonpolar characteristics, further reducing their solubility.
