Tag: functions and principal sources of lipids

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

Cerebroside is a

  1. Glycolipid

  2. Sterol

  3. Phospholipid

  4. Steroid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cerebroside is an important component of muscles and nerve cell membrane. It is also known as galactosylceramide. It is a class of glycolipids which consists of N -acyl sphingosine with glucose or galactose. Its deposition causes Gaucher disease. It is synthesized in endoplasmic reticulum and membranes of Golgi apparatus. It is degraded in the lysosomes. It is also known as galactolipid.

So, the correct answer is option A. 

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

Hydrolysis of lipid yields

  1. Fats

  2. Fatty acids and glycerol

  3. Mannose and glycerol

  4. Maltose and fatty acid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Most common lipids are triglycerides of glycerol and fatty acids. During digestion of lipids they are broken down into constituent fatty acids and glycerols by the action of lipase enzymes.

Hence B is the correct option. 

Multiple choice biology food and it's constituents functions and principal sources of lipids chemical organization in living beings lipids
Choose the correct combination:

$a$ Fatty acid $1.$ Glutamic acid
$b$ Phospholipid $2.$ Tryptophan
$c$ Aromatic Amino Acid $3.$ Lecithin
$d$ Acidic Amino Acid $4.$ Palmitic acid
  1. $a - 1, b - 2, c - 3, d - 4$
  2. $a - 4, b - 3, c - 2, d - 1$
  3. $a - 2, b - 3, c - 4, d - 1$
  4. $a - 3, b - 4, c - 1, d - 2$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

a) Palmitic acid is a saturated fatty acid. Its chemical formula is CH$ _3$(CH$ _2$)$ _{14}$COOH. Meat, cheese and diary products are the main source of the palmitic acid. It was first discovered in saponified palm oil. Excess carbohydrate in the body is converted into palmitic acid. 

b) Lecithin is an essential phospholipid which is present in the body. It is composed of choline, fatty acids, glycerol, glycolipids, phospholipids, phosphoric acid and triglycerides.
c) Tryptophan is a aromatic amino acid which acts as a precursor to the neurotransmitter. It helps in biosynthesis of proteins. It also helps in the synthesis of niacin and auxin.
d) Glutamic acid is an acidic amino acid which acts as a important neurotransmitter.
So, the correct answer is option B.

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

Commonly, candles are prepared from

  1. Bees wax

  2. Paraffin wax

  3. Stearic acid

  4. Both (b) and (c)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The use of wax used to prepare candles has changed during the past few centuries. Nowadays, standard commercial candles are made from a combination of Paraffin wax and Stearic acid. A small amount of Bee wax may or may not be added in the making.

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

A product of glycerol and phellonic acid is

  1. Wax

  2. Cutin

  3. Suberin

  4. Sterol
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Suberin is a type of lipid found in the cell wall of plants especially cork cells. It is a mixture of fatty acid material along with glycerol and phellonic acid. It gives rigidity and strength to cell wall in addition to imparting impermeability to cork cells.  Waxes are esters of long chain fatty acids with cetyl or mericyl alcohol. They are found in leaf surfaces of plants, bees wax, wool fat of animal furs and ear wax.  Cutin is a complex lipid formed by polymerisation of  hydroxy fatty acids with or without esterification by alcohols other than glycerol. It is found in the epidermal cell walls of plants and also as a separate layer outer to epidermis. It prevents the water loss due to transpiration. 

Sterols are complex lipids having one or more hydroxyl groups. For example cholesterol in animals provide stability to cell memebrane and also helps in synthesis of vitamin D in response to light. It is also an important component of various hormones such as testosterone, aldosterone, estrogen and progesterone.
Thus, the correct answer is option C. 

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

Among the following edible fishes which one is a marine fish having rich source of omega-3 fatty acids

  1. Mackerel

  2. Mystus

  3. Magur

  4. Mrigala
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The most widely available dietary source of omega-3 fats is oily fish, such as salmon, herring, mackerel, anchovies, menhaden, and sardines. All types of mackerel are higher-fat fish, rich in the healthful polyunsaturated fats known as long-chain omega-3s, which may help boost heart health. So, the correct answer is option A.

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

During symbiotic biological nitrogen fixation. The recognition of rhizobiahost interaction involves two classes of molecules there are _______________.

  1. Lectins an lipids

  2. Lectins and Polysaccharides

  3. Flavonoids and lipids

  4. Lectins and Alkaloids
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the symbiotic relationship between legumes and rhizobia, the initial recognition involves lectins (on the plant side) and specific polysaccharides or lipids on the bacterial surface.

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

The major driving force for the formation of membrane lipid bilayer 

  1. vander waal forces

  2. electrostatic force

  3. hydrophobic interactions

  4. H-bond
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The major driving force for the spontaneous formation of the lipid bilayer in biological membranes is the hydrophobic effect. Water molecules form an ordered cage around hydrophobic tails, and aggregation of these tails increases water entropy, stabilizing the bilayer.

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

Fats, oils, and steroids are

  1. Proteins

  2. Nucleic acids

  3. Polysaccharides

  4. Lipids
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lipids are storage compounds, triglycerides serve as reserve energy of the body. These are an important component of cell membranes structure in eukaryotic cells that helps in regulating membrane permeability. They serve as the source for fat-soluble vitamins like A, D, E, K. Example of lipids are fats, oils and steroids.

So the correct option is 'Lipids'.

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

In a phospholipid bilayer, the lipid molecules are sandwiched between

  1. hydrophobic heads; hydrophilic tails

  2. hydrophobic tails; hydrophilic heads

  3. hydrophilic heads; hydrophilic tails

  4. hydrophobic tails; hydrophobic heads
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
In the fluid mosaic model of the cell membrane, proposed by Singer-Nicolson in 1972, the phospholipid bilayer has integrated as well as peripheral proteins embedded in it. In this model, the lipid molecules are sandwiched between hydrophobic tails and hydrophilic heads.
So, the correct answer is 'hydrophobic tails; hydrophilic heads'.