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Biomolecules Test - 21

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Biomolecules Test - 21
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  • Question 1
    1 / -0
    Which of the following binds with three hydrogen bonds?
    Solution
    Nitrogenous bases are adenine, guanine, cytosine, and thymine in DNA. One of the chemical differences between DNA and RNA is that in RNA, the nitrogenous base uracil is used instead of thymine. 
    Nitrogenous bases can form hydrogen bonds. Adenine, thymine, and uracil can form two hydrogen bonds. Guanine and cytosine can form three hydrogen bonds. In nucleic acids (DNA and RNA), nitrogenous bases can bind to each other by hydrogen bonding. Guanine binds to cytosine, and cytosine bonds to guanine. In DNA, adenine binds to thymine. In RNA, adenine binds to uracil.
    So option B is correct. 
  • Question 2
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    Which of the following store proteins?
    Solution
    Aleuroplast is a leucoplast type of plastid that is involved in the storage of proteins. Chromoplasts are plastids, heterogeneous organelles responsible for pigment synthesis and storage in specific photosynthetic eukaryotes. 
    Amyloplasts are non-pigmented organelles found in some plant cells. They are responsible for the synthesis and storage of starch granules, through the polymerization of glucose. Elaioplasts are a type of leucoplast that is specialized for the storage of lipids in plants. 
    Therefore, the correct answer is option B.
  • Question 3
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    The source of protein is
    Solution
    Egg is a source of protein, rest all are sources of carbohydrates.
  • Question 4
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    All of the given nitrogenous bases are found in DNA except __________.
    Solution
    DNA is a polymer of deoxyribonucleotides. The deoxyribonucleotides are made up of phosphoric acid and deoxyribonucleosides. The deoxyribonucleosides are made up of deoxyribose sugars and nitrogenous bases. The nitrogenous bases present in DNA are purine (adenine or guanine) and pyrimidine (cytosine or thymine). Uracil is absent from DNA. Uracil is present as pyrimidine base in ribonucleotides which are components of RNA.
    So, the correct answer is option E.
  • Question 5
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    The pyrimidine in which bonding takes place through three hydrogen bonds
    Solution
    Cytosine forms three hydrogen bonds with guanine, and adenine forms two hydrogen bonds with thymine. 
    These hydrogen-bonded nitrogenous bases are often referred to as base pairs.
  • Question 6
    1 / -0
    Nitrogen is an important element in
    Solution
    Nitrogen is a component of amino acids and urea. Amino acids are the building blocks of all proteins. Proteins comprise not only structural components such as muscle, tissue and organs, but also enzymes and hormones essential for the functioning of all living things.
  • Question 7
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    Which one of the following is a catabolic process? 
    Solution
    Metabolism refers to series of reactions in which product of one reaction becomes reactant for the next one. It includes catabolism (degradative pathways) and anabolism (synthetic pathways). Digestion is the process in which complex compounds are broken down into the simpler form. Hence, option C is the correct answer. 
  • Question 8
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    Which of the following are essential for body growth and formation of new cells?
    Solution
    A balanced diet, consisting of all the constituents of food, is necessary for the body but for growth and new cell formation, proteins also known as building blocks are essential.
  • Question 9
    1 / -0
    Which of these is essential to synthesise proteins?
    Solution
    Proteins are biomolecules that are made of monomers called amino acids. Each amino acid has a variable side chain, an amino group and a carboxylic acid group in its general structure. The amino group shows nitrogen. Hence nitrogen carbon and hydrogen are elements required to make the basic structure. Thus the correct answer is option A.

  • Question 10
    1 / -0
    Which of the following complementary base pairing does not exist?
    Solution
    Option 'B' is correct.
    A DNA adenine to an RNA thymine complementary base pairing does not exist because it is RNA, The base thymine is not present: Instead of thymine uracil is present which consists of a very similar structure like thymine.
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