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Biomolecules Test - 22

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Biomolecules Test - 22
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The variable portion of DNA molecule is ___________.
    Solution
    The DNA molecule is a polymer of nucleotides. Each nucleotide is composed of a nitrogenous base, a five-carbon sugar (deoxyribose), and a phosphate group. There are four nitrogenous bases in DNA
  • Question 2
    1 / -0
    The complimentary base pairing in RNA molecules is seen between uracil and 
    Solution
    According to complementary base pairing, adenine makes two hydrogen bonds with thymine and guanine makes three hydrogen bonds with cytosine. RNA has uracil in place of thymine, so, adenine pairs with uracil in RNA. 
    So, the correct answer is option D.
  • Question 3
    1 / -0
    A nucleotide base present in RNA but absent in DNA is
    Solution
    There are two types of nitrogenous bases, namely purines and pyrimidines. Adenine and guanine are the purines while thymine, uracil, and cytosine are the pyrimidines. Adenine, guanine, and cytosine are common to both DNA and RNA. The thymine base of DNA is replaced with uracil in RNA. So, the correct answer is A.
  • Question 4
    1 / -0
    Which of the following options represent the building blocks of DNA?
    Solution
    option 'B' is correct.

    DNA is made up of nucleotides which are the chemical building blocks. 

    These building blocks are made up of these parts:-

    1. a phosphate group

    2. a sugar group

    3. four nitrogenous bases 
  • Question 5
    1 / -0
    Guanine in RNA is replaced by
    Solution

  • Question 6
    1 / -0
    The purine that binds with two hydrogen atoms and is found in both nucleic acids is ___________.
    Solution
    The purine bases of one nucleotide chain form hydrogen bonds with the pyrimidine bases present directly opposite them on the other chain. The hydrogen bonds are formed in the polar aqueous environment. The adenine base pairs with thymine with two hydrogen bonds and guanine base pairs with cytosine with three hydrogen bonds.
    So, the correct answer is option A.
  • Question 7
    1 / -0
    Dark reaction is a
    Solution
    The anabolic processes are the reactions in which the smaller organic molecules are used for the production of the large complex molecules. The carbon dioxide molecule is fixed in the dark reactions for the formation of the glucose molecule. Six molecules of CO$$_2$$ are fixed to form one molecule of glucose in which the energy is stored. 
    Thus, the correct answer is option A. 
  • Question 8
    1 / -0
    The most abundant molecule of protoplast is
    Solution
    The cellular fluid present inside the nucleus is known as nucleoplasm. The cellular fluid present between the nuclear membrane and the cell membrane is known as cytoplasm. The combination of cytoplasm and nucleoplasm is known as protoplasm. These are composed of proteins which combine with glucose to form glycoproteins, fats to form lipoproteins and nucleic acids to form nucleoproteins.
    So, the correct answer is option A.
  • Question 9
    1 / -0
    Cellular micromolecules are
    Solution
    • The cellular micromolecules are small in size and have low molecular weights which is less than 1000 daltons. 
    • They have a simple molecular structure and often high solubility in the intracellular fluid. 
    • These include inorganic compounds such as water, mineral salts, and gases as well as organic compounds such as sugars, lipids, amino acids, and nucleotides. 
    • The small molecules are the substrates and products of metabolism in the cell. These act as building blocks for the macromolecules. 
    • Glycogen and nucleic acids are macromolecules.

    Thus, the correct answer is option A. 
  • Question 10
    1 / -0
    Big four elements are
    Solution
    Oxygen is the most abundant element for the living organism. It is used for respiration. The oxygen inhaled supports the oxidation of food and releases energy. It plays an important role in the oxidative phosphorylation occurring in the mitochondria. The process produces energy in form of ATP. 
    Nitrogen is important component of the amino acids which is a monomer of protein.
    Carbon and hydrogen is a important constituent of carbohydrates which is a instant source of energy.
    So, the correct answer is option D.
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