Tag: chemical organization in living beings
Questions Related to chemical organization in living beings
Number of oxygen atoms in lipid molecules is always ......... as compared to number of carbon atoms
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Less
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More
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Equal
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Double
Which of the following lipid is essential part of good diet?
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Oleic acid
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Linoleic acid
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Stearic acid
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Palmitic acid
Structural lipids of cell membrane are
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Simple lipid
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Chromolipid
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Phospholipid
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Steroid
Which fatty acid is liquid at room temperature?
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Palmitic acid
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Stearic acid
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Lauric acid
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Linoleic acid
Steroids are
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Lipids
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Proteins
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Vitamins
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Carbohydrates
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.
Cerebroside is a
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Glycolipid
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Sterol
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Phospholipid
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Steroid
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.
Hydrolysis of lipid yields
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Fats
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Fatty acids and glycerol
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Mannose and glycerol
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Maltose and fatty acid
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.
$a$ | Fatty acid | $1.$ | Glutamic acid |
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$b$ | Phospholipid | $2.$ | Tryptophan |
$c$ | Aromatic Amino Acid | $3.$ | Lecithin |
$d$ | Acidic Amino Acid | $4.$ | Palmitic acid |
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$a - 1, b - 2, c - 3, d - 4$
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$a - 4, b - 3, c - 2, d - 1$
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$a - 2, b - 3, c - 4, d - 1$
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$a - 3, b - 4, c - 1, d - 2$
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.
Commonly, candles are prepared from
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Bees wax
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Paraffin wax
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Stearic acid
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Both (b) and (c)
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.
A product of glycerol and phellonic acid is
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Wax
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Cutin
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Suberin
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Sterol
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.