Tag: functions of lipids

Questions Related to functions of lipids

Why tails of lipids in the membrane are towards inner part?

bio-chemistry lipids functions of lipids biomolecules: chemical constituents of living cells biochemistry

  1. The tails is non-polar hydrocarbon and so, protected with an aqueous environment

  2. The tail is polar hydrocarbon and so, is protected from aqueous environment

  3. The non-polar or hydrophobic hydrocarbon trails of lipid, being on inner side ensure their protection from aqueous environment.

  4. The tail is hydrophilic so, it tends to be located in the aqueous inner side of membrane

Show answer
Correct Option: C
Explanation:

The tails of the lipids are made up of fatty acids. These are non-polar hydrophobic so they tend to arrange away from the cytoplasmic face as well as the extracellular face. So, they avoid aqueous medium by arranging themselves towards the inner part of the cell membrane.

Hence, the correct answer is 'The non-polar or hydrophobic hydrocarbons tails of lipid, being on inner side ensure their protection from the aqueous environment.

Which of the following can be traced in phospholipids of brain tissue and soybeans?

bio-chemistry lipids functions of lipids biomolecules: chemical constituents of living cells biochemistry

  1. Phosphoglycerides

  2. Phosphoinositides

  3. Cholesterol

  4. None of the above

Show answer
Correct Option: B
Explanation:

Phosphoinositides make up a small fraction of cellular phospholipids, They play a fundamental role in controlling membrane-cytosol interfaces, regulation of membrane traffic and the permeability and transport functions of membranes. They are found in brain tissue in animals and soybean seeds. Thus the correct answer is option B.

Deficiency of EFA causes

bio-chemistry lipids functions of lipids biomolecules: chemical constituents of living cells biochemistry

  1. Follicular keratosis

  2. Kidney failure

  3. Sterility

  4. All the above

Show answer
Correct Option: D
Explanation:

Essential fatty acids (EFA) are those fatty acids that body cannot produce on its own and therefore must be supplied from the diet. Deficiency of EFA causes many disease conditions like dry and scaly skin, follicular keratosis (hard and dry skin around hair follicles), bumps on back of upper arms, color variation of skin, dry eyes, mouth and throat, menstrual cramps, dry vagina, excessive thirst, eczema, asthma, hay fever, painful joint. In severe cases, it may result in kidney failure and sterility.

Thus, the correct answer is option D.