BIOMOLECULES AND ENZYMES

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BIOLOGY

PROTEINS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which statements about the differences between phospholipids and triglycerides are correct? 1 Phospholipids have hydrophobic regions but triglycerides do not.2 The fatty acids in a phospholipid are always saturated but in a triglyceride they may be saturated or unsaturated. 3 Phospholipids are polar molecules but triglycerides are non-polar.
A
A 1 and 2
B
B 1 only
C
C 2 and 3
D
D 3 only
Explanation: 

Detailed explanation-1: -Like triglycerides, phospholipids have a glycerol backbone. But unlike triglycerides, phospholipids only have two fatty acid molecules attached to the glycerol backbone, while the third carbon of the glycerol backbone is bonded to a phosphate group-a chemical group that contains the mineral phosphorus.

Detailed explanation-2: -Triglycerides are soluble only in fat, whereas phospholipids are soluble in both water and fat. Triglyceride molecule contains three fatty acid chains, whereas phospholipid molecule contains two fatty acids plus one phosphate group.

Detailed explanation-3: -Which of the following is a true statement comparing phospholipids and triacylglycerols (fats and oils)? Phospholipid molecules have a distinctly polar “head” and a distinctly nonpolar “tail, ” whereas triacylglycerols are predominantly nonpolar.

Detailed explanation-4: -Basic structure of a phospholipid The main diffrences between a trglyceride and a phospholipid are: • a phospholipid contains two fatty acid components but a triglyceride contains three. a phospholipid contains a phosphate group but a triglyceride does not.

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