NURSING ANM AND GNM

NURSING EXAM QUESTIONS

BIOCHEMISTRY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
All organisms contain four organic molecules. Which group of molecules contains fatty acids and glycerol, is insoluble in water, and functions in long term energy storage?
A
carbohydrates
B
nucleic acids
C
proteins
D
lipids
Explanation: 

Detailed explanation-1: -Lipids. Lipids include a diverse group of compounds that are united by a common feature. Lipids are hydrophobic (“water-fearing”), or insoluble in water, because they are nonpolar molecules. This is because they are hydrocarbons that include only nonpolar carbon-carbon or carbon-hydrogen bonds.

Detailed explanation-2: -One major class of lipids is called glycerolipids. Glycerolipids are composed of glycerol and fatty acids.

Detailed explanation-3: -Lipids are fatty, waxy, or oily compounds that are soluble in organic solvents and insoluble in polar solvents such as water. Lipids include: Fats and oils (triglycerides)

Detailed explanation-4: -In Summary: Lipids Fats are a stored form of energy and are also known as triacylglycerols or triglycerides. Fats are made up of fatty acids and either glycerol or sphingosine. Fatty acids may be unsaturated or saturated, depending on the presence or absence of double bonds in the hydrocarbon chain.

Detailed explanation-5: -Phospholipids. Phospholipids consist of two hydrophobic “tails, ‘’ which are fatty acid chains, and one hydrophilic “head, ‘’ which is phosphate group. They connect with glycerol and the “head” is typically found at the sn-3 position.

There is 1 question to complete.