Tag: lipids

Questions Related to lipids

Match the column I with column II and select the correct option from the codes given below.

 Sr. No  Column I  Sr.No  Column II
 A.  Fats made of three fatty acid chain attached to glycerol   (i)  Glycogen 
 B.  Glycolysis metabolic made from glycerol   (ii)  Glyceraldehyde 
 C.  Storage form of glucose  (iii)   Triglycerides
 D.  the common respiratory substrate of glycolysis  (iv)  Glucose
biology food and it's constituents functions and principal sources of lipids chemical organization in living beings lipids

  1. A-(iv),B(ii),C(i),D(iii)

  2. A-(iii),B(ii),C(i),D(iv)

  3. A-(iv),B(iii),C(i),D(ii)

  4. A-(i),B(ii),C(iii),D(iv)

Show answer
Correct Option: B
Explanation:
 Column I  Column II
 A.Fats made of three fatty acid chain attached to glycerol iii)Triglycerides
B. Glycolysis metabolic made from glycerol  ii) Glyceraldehyde
 C. Storage form of glucose  i) Glycogen 
 D. common respiratory substrate for glycolysis iv) glucose 

So, the correct option is 'A-(iii),B(ii),C(i),D(iv)'.

Choose the correct answer from the alternatives given.
Which of the following factors would tend to increase membrane fluidity?

biology food and it's constituents functions and principal sources of lipids chemical organization in living beings lipids

  1. A greater proportion of unsaturated phospholipids

  2. A high membrane potential

  3. A lower temperature

  4. A lower cholesterol concentration in the membrane

Show answer
Correct Option: A
Explanation:
The fluidity of the phospholipid bilayer depends on different factors like the length of the fatty acid chain, the temperature, the cholesterol content, and the level of saturation in the layer. As the amount or number of unsaturated fatty acids increases in the bilayer, so does the fluidity.

So, the correct answer is 'A greater proportion of unsaturated phospholipids'.

Name the chemical formula.
C$ _{16}$H$ _{32}$O$ _2$

bio-chemistry biological molecule lipids and their function some biomolecules lipids

  1. Palmitic acid

  2. Stearic acid

  3. Glycerol

  4. Galactose

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Correct Option: A
Explanation:

Palmitic acid or hexadecanoic acid was discovered by Edmond Fremy. It is commonly found in plants, animals and microorganisms.Its chemical formula is CH$ _3$(CH$ _2$)$ _{14}$COOH.It is a saturated fatty acid.

Which of the following is not an essential unsaturated fatty acid


bio-chemistry biological molecule lipids and their function some biomolecules lipids

  1. Oleic acid

  2. Linoleic acid

  3. Linolenic acid

  4. Stearic acid

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Correct Option: D

What is a cholesterol?

bio-chemistry biological molecule lipids and their function some biomolecules lipids

  1. Phospholipid

  2. Wax

  3. Steroid

  4. Triglyceride

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Correct Option: C
Explanation:

Steroids are crystallisable lipids having four hydrocarbon rings consisting of three cyclohexane and one cyclopentane ring and a long hydrocarbon side chain. Fatty acids are absent. In animals, sterols are precursors of steroid hormones and vitamin D. Cholesterol is a sterol of animal systems which forms bile salts, is a component of plasma membrane and hormones.

Essential fatty acids were discovered by

bio-chemistry biological molecule lipids and their function some biomolecules lipids

  1. Evans and Burr

  2. Bloor

  3. Sutherland

  4. Beevers

Show answer
Correct Option: A
Explanation:

Essential fatty acids are those fatty acid which plays an important role in the biological process and they can be metabolized easily. These acts as a fuel rather getting deposited as fat in the body. The human body cannot synthesize essential fatty acids. Alpha-linolenic acid and linoleic acid are the two essential fatty acid. It was discovered by Evans and Burr.

So, the correct answer is option A.

Lanolin or wool fat is a

bio-chemistry biological molecule lipids and their function some biomolecules lipids

  1. Hard fat

  2. Oil

  3. Wax

  4. Sterol

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Correct Option: C
Explanation:

Lanolin is also known as wool fat, wool grease or wool wax. It is secreted by the sebaceous glands of wool-bearing animals. It is obtained by the sheep which has been raised specifically for wool. It helps the sheep to shedd water from their coats and protect them from changing environmental conditions. Wax is a long chain of sterol ester. It is also used in commercial production of lubricants, rust-preventive coatings, shoe polish.

So, the correct answer is option C.

Linoleic is unsaturated fatty acid whose content is highest in

bio-chemistry biological molecule lipids and their function some biomolecules lipids

  1. Cotton oil

  2. Sunflower oil

  3. Coconut oil

  4. Groundnut oil

Show answer
Correct Option: B
Explanation:

Unsaturated fats are liquid at room temperature as they have double bonds. The essential fatty acids like alpha-linolenic acid and linoleic acid are unsaturated as they have double bonds. Sunflower oil is a non- volatile oil. It is a mixture of mostly oleic acid (omega-9)-linoleic acid (omega-6). The composition precisely comprises of  59% linoleic acid, oleic acid 30%, stearic acid 6%, and palmitic acid is 5%.

So, the correct answer is option B.

Match the columns:

$a$ Biological pigments $1.$ Sodium chloride
$b$ Chemical messengers $2.$ Steroids
$c$ Important constituent of blood $3.$ Prostaglandins
$d$ Four carbon rings $4.$ Terpenes
bio-chemistry biological molecule lipids and their function some biomolecules lipids

  1. $a - 2, b - 4, c - 3, d - 1$

  2. $a - 2, b - 1, c - 4, d - 3$

  3. $a - 3, b - 4, c - 2, d - 1$

  4. $a - 4, b - 3, c - 1, d - 2$

  5. $a - 3, b - 4, c - 1, d - 2$

Show answer
Correct Option: D

Arachidonic acid gives rise to

bio-chemistry biological molecule lipids and their function some biomolecules lipids

  1. Terpenes

  2. Prostaglandins

  3. Gangliosides

  4. Cerebrosides

Show answer
Correct Option: B
Explanation:
Arachidonic acid is a polyunsaturated omega-6 fatty acid. It is present in the phospholipids and helps in the formation of membranes. It is not considered as essential fatty acid as it can be easily formed by the conversion of linoleic acid to arachidonic acid. It is the most abundant fatty acid in the brain. It helps in the synthesis of prostaglandins. The prostaglandins synthesized is PG$ _2$. They are autocrine and paracrine lipid mediators that act upon platelets, endothelium, uterine and mast cells. 
So, the correct answer is option D.