Tag: biology

Questions Related to biology

Assertion : Proteins are organic components.
Reason : Amino acids are the basic units of proteins formed by hydrolysis.

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

  1. Assertion and reason both are correct , but reason is not the correct explanation for assertion.

  2. Assertion and reason is correct, reason is correct explanation of assertion

  3. Assertion and reason both are wrong

  4. Assertion is correct but reason if wrong

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Correct Option: A
Explanation:

Proteins are building blocks of body. They are formed by monomer units i.e amino acids. Many amino acids undergo condensation reaction to form peptide bond.

Major requirement of protein in the body is for

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

  1. Energy

  2. Growth

  3. Repair

  4. Proper nourishment

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Correct Option: B,C
Explanation:
The major requirement of protein in the body is for growth and repair.
Protein is a nutrient needed by the human body for growth and maintenance. Aside from water, proteins are the most abundant kind of molecules in the body. Protein can be found in all cells of the body and is the major structural component of all cells in the body, especially muscle. This also includes body organs, hair and skin. Proteins are also used in membranes, such as glycoproteins. When broken down into amino acids, they are used as precursors to nucleic acid, coenzymes, hormones, immune response, cellular repair, and other molecules essential for life. Additionally, protein is needed to form blood cells.

Proteins that helped in trapping solar energy and developed an electric potential across covering membranes of protocells were :

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

  1. Chromophores

  2. Chlorophores

  3. Xanthophores

  4. Both B and C

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Correct Option: A

In which one of the following combinations, the compounds are arranged in ascending order based on their molecular weights?

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

  1. DNA, RNA, AMP, ADP, ATP

  2. DNA, RNA, ATP, ADP, AMP

  3. AMP, ADP, ATP, RNA, DNA

  4. AMP, ATP, ADP, DNA, RNA

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Correct Option: A

Which of the following is biomolecule but not true polymer?

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

  1. Lipid

  2. cellulose

  3. Nucleic acids

  4. amino acids

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Correct Option: A
Explanation:

Lipid is not a true polymer as it contains a distinct functional group at one end in addition to repeated units of Hydrocarbons. So, the growth of the polymer takes place only in one direction, which does not  occur in case of polymers. 

So, the correct answer is 'Lipid'
                                                                                                                   

The term lipid was given by

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

  1. Sutherland

  2. Bloor

  3. Altmann

  4. Berzelius

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Correct Option: B
Explanation:

Lipids are fatty acids esters of alcohols. They are insoluble in water but get dissolved in an inorganic solvent like acetone, chloroform ether etc. lipid was termed by Bloor in 1943. Altman discovered mitochondria. Berzelius discovered chemical elements selenium, throium, cerium and silicon and Sutherland discovers the epinephrine. Thus, the correct option is B.

Hydrolysis of lipid yields

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

  1. Fats

  2. Fatty acids and glycerol

  3. Mannose and glycerol

  4. Maltose and fatty acid

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Correct Option: B
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.

The other name of fats is

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

  1. Lipids

  2. Proteins

  3. Carbohydrates

  4. Nucleic acids

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Correct Option: A
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.

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

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

  1. Linoleic acid

  2. Oleic acid

  3. Arachidonic acid

  4. None of the above

Show answer
Correct Option: A
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'.

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

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

  1. Ether

  2. Water

  3. Chloroform

  4. Benzene

Show answer
Correct Option: B
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.