Tag: food and it's constituents

Questions Related to food and it's constituents

Cholesterol belongs to group

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

  1. Steroid

  2. Neutral fats

  3. Waxes

  4. Phospholipids

Show answer
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 are arranged in four fused structure. It is found in plants, animals and fungi. Steroids such as cholesterol forms an integral component of the cell membrane and alter the membrane fluidity. They also acts as hormone receptor for steroidal hormones. It acts as a precursor for the biosynthesis of steroid hormones, bile acid, and vitamin D. 
So, the correct answer is option A.

Lipids are insoluble in water because lipids molecules are

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

  1. Hydrophilic

  2. Hydrophobic

  3. Neutral

  4. Zwitter ions

Show answer
Correct Option: B
Explanation:

Lipids are hydrophobic (water repelling) and non-polar. Non-polar substances, for instance fats and oils cannot be dissolved in water because they have made up of only carbon-carbon and hydrogen-carbon bonds. Only polar solutes dissolve in polar solvents.

So, the correct option is 'Hydrophobic'.

Which of these is not a lipid?

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

  1. Steroid

  2. Fat

  3. Polysaccharide

  4. Wax

Show answer
Correct Option: C
Explanation:

The polysaccharide is a carbohydrate that is formed by the bond formation between various monomers like glucose, fructose etc. Its examples are starch, cellulose, chitin, glycogen, etc.

Hence, the correct answer is 'Polysaccharide'.

Jojoba (Simmondsia) possesses

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

  1. Triglyceride and wax

  2. Wax

  3. Triglyceride

  4. Sterol

Show answer
Correct Option: B
Explanation:
Wax is a long chain of sterol ester. It is also used in commercial production of lubricants, rust-preventive coatings, shoe polish. Jojoba is a liquid extracted from Simmondsia chinensis of mono-esters of long-chain fatty acids and alcohols, accompanied by only a tiny fraction of triglyceride esters. It has resistance to high temperatures. It is a fungicide. It  can be used for controlling mildew.
So, the correct answer is option B.

Which one is a lipid?

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

  1. Stachyose

  2. Lycopene

  3. Leucine

  4. None of the above

Show answer
Correct Option: D
Explanation:

Stachyose is a tetrasaccharide consisting of 2 galactose, one glucose and one fructose units. It occurs naturally in green beans, soya beans and other beans. It is less sweet than sucrose. Its molecular formula is $C _{24}H _{42}O _{21}$

Lycopene is a naturally occurring carotenoid pigment which gives fruits and vegetables its red colour. It is found in watermelon, tomato and red carrots. It protects lipids, proteins and DNA against oxidative damage. It is a powerful antioxidant which protects the body from damage against various diseases.
Leucine is an amino acid which stimulates muscle protein synthesis and also prevents the deterioration of muscles with proteins. It is found in cheese, soyabean, beef, pork, nuts, seeds, fish etc.
Thus, the correct answer is option D. 

Lipids are classified into $3$ main types, which includes

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

  1. Simple lipids

  2. Compound lipids

  3. Derived lipids

  4. All of them

Show answer
Correct Option: D
Explanation:

Lipids are classified into simple, compound and derived lipids. 

  1. Simple lipids are esters of fatty acids with various types of alcohols.
  2. Compound lipids are esters of fatty acids with various types of alcohols in addition to a prosthetic group.
  3. Derived lipids are those produced by the hydrolysis of the first two groups.
So the correct option is 'All of them'

Choose the odd one out w.r.t. polymer _____________.

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

  1. Proteins

  2. Lipids

  3. Polysaccharides

  4. Nucleic acids

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Correct Option: B
Explanation:

Proteins are made of amino acids (monomers) and polysaccharides or sugars are made of monosaccharides (monomers).  Nucleic acids or DNA and RNA are made of nucleotides again monomers. However, lipids are not polymers made of smaller monomeric units. 

So, the correct answer is, 'Lipids'.

Choose the correct answer from the alternatives given.
In a phospholipid bilayer, the

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

  1. Phosphate groups are hydrophobic

  2. Fatty acid tails are hydrophilic

  3. Proteins are located only between the two layers

  4. Phosphate heads are oriented towards the exterior of the cell or toward the cytoplasm

Show answer
Correct Option: D
Explanation:
In the fluid mosaic model, the phospholipid bilayer has integrated as well as peripheral proteins embedded in it. This bilayer is composed of hydrophilic phosphate heads and hydrophobic tails. The phosphate heads are oriented towards the exterior or towards the cytoplasm.

So, the correct answer is 'Phosphate heads are oriented towards the exterior of the cell or toward the cytoplasm'.

A phospholipid molecule has a head and two tails, The tails are found

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

  1. At the surfaces of the membrane

  2. In the interior of the membrane

  3. Spanning the membrane

  4. Both (a) and (b)

Show answer
Correct Option: B
Explanation:
In a cell membrane, the hydrophobic ends of phospholipid molecules in the outer monolayer of the membrane are sandwiched between the hydrophilic heads of the phospholipid bilayer and are not exposed to the environment.

So, the correct answer is 'In the interior of the membrane'.

Identify the correct statements w.r.t the given cell
A. Concerned with lipid and steroidal hormone synthesis
B. Outer non living rigid structure which gives shape to the cell and protects from mechanical damage and infection.
C. Both lie perpendicular to each other and each has an organisation like the cart wheel'
D. Responsible for trapping light energy for the synthesis of sugar.
E. Present in cells actively involved in protein synthesis and secretion..
F. Spherical structures, rich in hydrolytic enzymes.

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

  1. A, D & E

  2. B, C & D

  3. A, C & E

  4. A, B, C & F

Show answer
Correct Option: A