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Biomolecules Test - 41

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Biomolecules Test - 41
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  • Question 1
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    Proteins which is present in protoplasm are very important because
    Solution
    Proteins are the most versatile biomolecules. They have a variety of structural and functional roles. The most important functional role of proteins is biocatalysis. The biocatalytic proteins are called enzymes. Enzymes catalyse biological reactions and are indispensable for metabolism of living beings. 
  • Question 2
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    The example of phosphoprotein is
    Solution
    Phosphoproteins are conjugate proteins, post-translationally modified by the attachment of phosphate group. Common examples of naturally occurring phosphoproteins are milk protein casein and ovo-vitellin of egg yolk.
  • Question 3
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    Which of following base pair is wrong?
    Solution
    In nucleic acids, Purines pairs with the pyrimidines. Adenine base pairs with thymine or uracil with the help of two hydrogen bonds and guanine base pairs with cytosine with the help of a triple hydrogen bond.
    So, the correct answer is option C.
  • Question 4
    1 / -0
    Which of the following is the most structural part of the body?
    Solution
    Carbohydrates, proteins, lipids and nucleic acids are the biomolecules of living systems. Carbohydrates, proteins and nucleic acids are macromolecular formed of multiple units of monomers whereas lipids are not macromolecules. Carbohydrates can also occur in monomer which is single unit form. Carbohydrates provide energy. Proteins are body building molecules, lipids act as long term storage of energy, formation of hormones, forming membrane lipids etc. Nucleic acids are repository of genetic information.
  • Question 5
    1 / -0
    The antibodies are
    Solution
    The antibodies are $$\gamma$$-globulins. An antibody, also known as an immunoglobulin, is a large Y-shape protein produced by plasma cells that is used by the immune system to identify and neutralize foreign objects such as bacteria and viruses. The antibody recognizes a unique part of the foreign target, called an antigen. $$\gamma$$-globulins are a class of globulins, identified by their position after serum protein electrophoresis. The most significant gamma globulins are immunoglobulins, a subclass of which are antibodies.
  • Question 6
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    Which of the following sugar is found in ATP?
    Solution
    ATP denotes adenosine triphosphate. ATP is a ribonucleotide made up of phosphoric acid and ribonucleosides. The ribonucleoside used in the formation of ATP is adenosine. The adenosine is made up of adenine base and ribose sugar.
    So, the correct answer is option B.
  • Question 7
    1 / -0
    Substance common in DNA and RNA is
    Solution
    DNA and RNA both are nucleic acids made up of deoxyribonucleotides and ribonucleotides respectively. Deoxyribonucleotides are made up phosphoric acid and deoxyribonucleosides. Ribonucleotides are made up of phosphoric acid and ribonucleosides. The deoxyribonucleosides and ribonucleosides differ in the sugar present in them as well as the nitrogenous bases present are different. In both deoxyribonucleotides and ribonucleotides, the phosphoric acid is the common component.
    So, the correct answer is option D.
  • Question 8
    1 / -0
    Nucleic acids are found in which of the following?
    Solution
    Nucleic acids in an organism consist of both DNA and RNA. Deoxyribonucleic acid (DNA) is found mainly in the nucleus of the cell, while Ribonucleic acid (RNA) is found mainly in the cytoplasm of the cell although it is usually synthesized in the nucleolus. The DNA is present as the extrachromosomal material in the organelle like mitochondria and chloroplast which are present in the cytoplasm.
    So, the correct answer is option C.
  • Question 9
    1 / -0
    Nucleic acid (DNA) is not found in
    Solution
    A eukaryotic cell has DNA in the nucleus as well as cell organelles like mitochondria and chloroplasts. The DNA in cell organelles resembles prokaryotic DNA. Ribosomes are naked ribonucleoprotein particles made up of RNA and proteins. Peroxisomes are microbodies having enzymes for peroxide biosynthesis. and peroxide destroying catalase enzyme.
    So, the correct answer is option B.
  • Question 10
    1 / -0
    The number of H bonds between guanine and cytosine are
    Solution
    The number of H-bonds between guanine and cytosine are three. In a DNA double helix, each type of nucleobase on one strand bonds with just one type of nucleobase on the other strand. This is called complementary base pairing. Here, purines form hydrogen bonds to pyrimidines, with adenine bonding only to thymine in two hydrogen bonds, and cytosine bonding only to the guanine in three hydrogen bonds. This arrangement of two nucleotides binding together across the double helix is called a base pair. As hydrogen bonds are not covalent, they can be broken and rejoined relatively easily. 
    So, the correct answer is option C.
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