Nucleic Acids and DNA Structure Quiz
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Questions and Answers

What type of linkage joins the monosaccharide units in starch?

  • Phosphodiester linkage
  • C1–C6 glycosidic linkage
  • Peptide linkage
  • C1–C4 glycosidic linkage (correct)
  • Which component of starch is water-soluble and constitutes about 15-20% of starch?

  • Cellulose
  • Amylopectin
  • Glycogen
  • Amylose (correct)
  • What is the main storage polysaccharide in plants?

  • Chitin
  • Cellulose
  • Starch (correct)
  • Glycogen
  • Which type of glucose units make up cellulose?

    <p>b-D-glucose units</p> Signup and view all the answers

    What type of glycosidic linkage forms branching in amylopectin?

    <p>C1–C6 glycosidic linkage</p> Signup and view all the answers

    What is the primary structure of a protein?

    <p>The sequence of amino acids in a polypeptide chain</p> Signup and view all the answers

    Which polysaccharide serves as a predominant constituent of the cell wall of plant cells?

    <p>Cellulose</p> Signup and view all the answers

    Which type of structure results from the folding of the backbone of a polypeptide chain?

    <p>Tertiary structure</p> Signup and view all the answers

    What creates different proteins from each other?

    <p>Primary structure differences</p> Signup and view all the answers

    Which type of bonding is responsible for the a-Helix structure of a polypeptide chain?

    <p>Hydrogen bonding</p> Signup and view all the answers

    In which level of protein structure do proteins have one or more polypeptide chains?

    <p>Primary structure</p> Signup and view all the answers

    Which term describes the shape in which a long polypeptide chain can exist?

    <p>Secondary structure</p> Signup and view all the answers

    What is the primary structure of a nucleic acid?

    <p>Sequence of nucleotides</p> Signup and view all the answers

    Who proposed the double-strand helix structure for DNA?

    <p>Francis Crick</p> Signup and view all the answers

    What type of bonds hold the two nucleic acid chains together in the double helix structure of DNA?

    <p>Hydrogen bonds between pairs of bases</p> Signup and view all the answers

    Which nucleotide forms hydrogen bonds with cytosine in DNA?

    <p>Thymine</p> Signup and view all the answers

    What are the three types of RNA molecules mentioned?

    <p>Messenger RNA, transfer RNA, ribosomal RNA</p> Signup and view all the answers

    Where did Har Gobind Khorana obtain his M.Sc. degree from?

    <p>Punjab University in Lahore</p> Signup and view all the answers

    Which type of carbohydrates provide optically active polyhydroxy aldehydes or ketones upon hydrolysis?

    <p>Monosaccharides</p> Signup and view all the answers

    What is the most important source of energy for mammals obtained by the digestion of starch?

    <p>Glucose</p> Signup and view all the answers

    Why are ten amino acids referred to as essential amino acids?

    <p>They must be provided through diet</p> Signup and view all the answers

    What happens to the secondary or tertiary structure of proteins when there is a change in pH or temperature?

    <p>They get denatured</p> Signup and view all the answers

    Which biomolecules speed up reactions in biosystems and are very specific and selective in their action?

    <p>Proteins</p> Signup and view all the answers

    How are vitamins classified based on their solubility?

    <p>Based on their solubility</p> Signup and view all the answers

    What did Dr Khorana share the Nobel Prize for Medicine and Physiology for in 1968?

    <p>Cracking the genetic code</p> Signup and view all the answers

    Why are DNA fingerprints considered unique for each individual?

    <p>Because the sequence of bases on DNA is unique</p> Signup and view all the answers

    In which scenario can DNA fingerprinting be altered?

    <p>Through known treatments</p> Signup and view all the answers

    What is the primary function of DNA according to the text?

    <p>Maintaining identity of different species of organisms</p> Signup and view all the answers

    Which process involves transferring identical DNA strands to daughter cells?

    <p>Cell division</p> Signup and view all the answers

    What is responsible for synthesizing proteins in the cell according to the text?

    <p>RNA molecules</p> Signup and view all the answers

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