Tag: functions and principal sources of lipids

Questions Related to functions and principal sources of lipids

Which biomolecule is made up of only carbon, hydrogen and oxygen?

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

  1. Lipids

  2. Proteins

  3. Carbohydrates

  4. Nucleic acids

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Correct Option: A
Explanation:

Proteins are the polymers of amino acids and have C, H, O, N and S. Carbohydrates and  nucleic acids have C, H, O, N, P and S. Lipids are chemically diverse group and mostly have long hydrocarbon chain composed of C, H and O. Thus, the correct answer is A.

Maximum percentage of lipoprotein is present in

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

  1. Chylomicron

  2. HDL

  3. VDL

  4. VLDL

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Correct Option: A
Explanation:
A lipoprotein is a biochemical assembly that contains both proteins and lipids. There are several types of lipoproteins, each having different functions, but all essentially are transport vehicles. Lipoproteins are categorized and named mainly accordingly to their density which varies with the ratio of lipids to proteins from largest and highest to smallest and heaviest, the four major classes of lipoproteins are chylomicrons, VLDL, LDL and HDLs.
So the correct answer is 'Chylomicron'.

Sphaerosomes have

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

  1. Cellulose reserve

  2. Protein reserve

  3. Lipid reserve

  4. Both protein and lipid reserve.

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Correct Option: C

Which of the following is not a lipid?

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

  1. Wax/ lecithin

  2. Sterol/ cholesterol

  3. Glycerol/ maltose

  4. Lecithin/ Ghee

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Correct Option: C
Explanation:
Lipids:- lipids are molecules that contain hydrocarbons & make up the building blocks of the structures & function of living cells. e.g. - Fats, oil, waxes, contain vitamins (such as A, D, E, & K), Hormones & most of all cell membranes that is not made up of protein.

Select the wrong statement?

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

  1. The protein part of the holoenzyme is called the apoenzyme

  2. Thylakoids are arranged one above the other like stack of coins forming a granum

  3. Building blocks of lipid are amino acids

  4. Cross-over occurs at pachytene stage of meiosis I

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Correct Option: C
Explanation:

Cofactor is a nonprotein part of the enzyme. It can be metal ions or the organic chemical. The cofactors which are organic chemicals are known as coenzyme. These are loosely attached to the apoenzyme. The tightly bound coenzymes are prosthetic group. 

Thylakoids are coin like structure present in the matrix of chloroplast which are stacked to form granum. 
Crossing over in meiosis helps in recombination by exchanging the segments between non homologous chromosomes.
Steroids are the organic molecule which plays an important role in the growth and development of the body. The molecular structure consists of 17 carbon which is arranged in four fused structure. It is found in plants, animals, and fungi. Steroids such as cholesterol form an integral component of the cell membrane and alter the membrane fluidity.
Lipids are nonpolar molecules so they are unable to interact with the polar molecule like water and thus they are insoluble in water. It is a hydrophobic molecule which is formed by ester linkage of the glycerol molecule with three fatty acid molecule. It does not consist amino acids. But the polymer of amino acids is protein.
So, the correct answer is option C.

Number of oxygen atoms in lipid molecules is always ......... as compared to number of carbon atoms

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

  1. Less

  2. More

  3. Equal

  4. Double

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Correct Option: A
Explanation:
Lipid is formed by ester linkage of the glycerol molecule with three fatty acid molecules. The reaction by which the lipids are formed is known as dehydration. It is an important constituent of the cell membrane. It has the hydrophobic tail which does not interact with water. A lipid molecule has six oxygen and nine carbon atom. The carbon atom can vary depending on the R group attached to the fatty acid.
So, the correct answer is option A.

Which of the following lipid is essential part of good diet?

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

  1. Oleic acid

  2. Linoleic acid

  3. Stearic acid

  4. Palmitic acid

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Correct Option: B
Explanation:
Essential fatty acids are that 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. The essential fatty acids like alpha-linolenic acid and linoleic acid are unsaturated as they have double bonds.
So, the correct answer is option B.

Structural lipids of cell membrane are

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

  1. Simple lipid

  2. Chromolipid

  3. Phospholipid

  4. Steroid

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Correct Option: C
Explanation:
Phospholipids are the structural lipids which have phosphorous attached to the lipids molecules. It is an important constituent of the cell membrane. It is made up of two hydrophobic fatty acid tails and a hydrophilic head consisting of a phosphate group. The two constituents are joined by a glycerol molecule. It can easily form bilayer because of its amphiphilic nature. It has the hydrophobic tail which does not interact with water and a hydrophilic head which can interact with water.
So, the correct answer is option C.

Which fatty acid is liquid at room temperature?

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

  1. Palmitic acid

  2. Stearic acid

  3. Lauric acid

  4. Linoleic acid

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Correct Option: D

Steroids are

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

  1. Lipids

  2. Proteins

  3. Vitamins

  4. Carbohydrates

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Correct Option: A
Explanation:

Steroids are the organic molecule which plays an important role in the growth and development of the body. The molecular structure consists of 17 carbon which is arranged in four fused structure. It is found in plants, animals, and fungi. It is considered as an important class of lipids as they have properties similar to the triglycerides. It also plays important role in defensive mechanism of the body.

So, the correct answer is option A.