Question

a triglyceride consists of
a 3 glycerols and 1 fatty acid.
b 3 glucose molecules.
c 3 fatty acids and 3 phosphate groups.
d 3 fatty acids and 1 glycerol.

question 42
glycogen is stored in the liver and ______.
a spleen
b skeletal muscles
c pancreas
d heart

Explanation:

First Question (Triglyceride composition)

To determine the correct composition of a triglyceride, recall the structure of triglycerides. Triglycerides are lipids formed by the esterification of 1 glycerol molecule with 3 fatty acid molecules. Option A is incorrect (it has 3 glycerols and 1 fatty acid, which is the reverse). Option B is incorrect as glucose is a carbohydrate, not part of triglyceride structure. Option C is incorrect because phosphate groups are part of phospholipids, not triglycerides. Option D correctly states 3 fatty acids and 1 glycerol.

Glycogen is a storage form of glucose. It is primarily stored in the liver and skeletal muscles. The spleen, pancreas, and heart do not store glycogen in significant amounts for energy storage like the liver and skeletal muscles do. So the correct option is B.

Answer:

D. 3 fatty acids and 1 glycerol.

Second Question (Glycogen storage)