Tag: chemical organization in living beings

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Multiple choice biology meaning of life chemical organization in living beings lipids proteins and their structure

The other name of fats is

  1. Lipids

  2. Proteins

  3. Carbohydrates

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

Proteins are the polymers of amino acids held together by peptide bonds and are also called as polypeptides. Carbohydrates (sugars) are polyhydroxy aldehyde or ketones or their derivatives. Nucleic acids are polymers of nucleotides held together by phosphodiester bonds. Fats are fatty acid derivatives and are one of the storage lipids. Thus, the correct answer is A.

Multiple choice biology meaning of life chemical organization in living beings lipids proteins and their structure

Most essential fatty acid is ..........

  1. Linoleic acid

  2. Oleic acid

  3. Arachidonic acid

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The most essential fatty acids are that fatty acids that are not synthesized in our body and must come from the food we eat. For example, Linoleic acid (Omega-6 fatty acid ) is a most essential fatty acid. Linolenic acid is found in vegetable oils such as sunflower, soybean, corn, and canola oils as well as nuts and seeds.
So, the correct answer is 'Linoleic acid'.
Multiple choice biology meaning of life chemical organization in living beings lipids proteins and their structure

In which of the following solvents lipids are found to be insoluble?

  1. Ether

  2. Water

  3. Chloroform

  4. Benzene
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lipids are compounds of carbon, hydrogen and oxygen where ratio of hydrogen and oxygen is less than that of water. Lipids are esters of fatty acids and alcohol which form emulsion with water but are soluble in organic solvents. Some of the common examples of lipids are butter, ghee, cholesterol, carotene etc.

Multiple choice biology meaning of life chemical organization in living beings lipids proteins and their structure

Lipids are insoluble in water because they are

  1. Neutral

  2. Zwitter ions

  3. Hydrophobic

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

Lipids are hydrophobic means water hating. They are water insoluble. Lipids are non-polar molecules while water is polar molecule, so there is no way for water to attach to a lipid molecule. Instead, the non-polar lipids will bind to themselves, which is why oils and fats form droplets on the surface of water.

Multiple choice biology meaning of life chemical organization in living beings lipids proteins and their structure

Membrane phospholipids are

  1. Amphipathic

  2. Amphibolic

  3. Hydrophobic

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Membrane phospholipids are amphipathic having a polar head made of phosphate residue and a non-polar lipid tail. The polar phosphate head is exposed on the surface while non-polar lipids are embedded within the interior of membrane.

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

Cholesterol belongs to group

  1. Steroid

  2. Neutral fats

  3. Waxes

  4. Phospholipids
Reveal answer Fill a bubble to check yourself
A Correct answer
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.
Multiple choice biology food and it's constituents functions and principal sources of lipids chemical organization in living beings lipids

Lipids are insoluble in water because lipids molecules are

  1. Hydrophilic

  2. Hydrophobic

  3. Neutral

  4. Zwitter ions
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

Which of these is not a lipid?

  1. Steroid

  2. Fat

  3. Polysaccharide

  4. Wax
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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

Jojoba (Simmondsia) possesses

  1. Triglyceride and wax

  2. Wax

  3. Triglyceride

  4. Sterol
Reveal answer Fill a bubble to check yourself
B Correct answer
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.
Multiple choice biology food and it's constituents functions and principal sources of lipids chemical organization in living beings lipids

Which one is a lipid?

  1. Stachyose

  2. Lycopene

  3. Leucine

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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.