Nucleotide Chemistry and Biochemical Functions Quiz
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Questions and Answers

What are the building units of nucleic acids?

  • Nucleosides and nucleotides (correct)
  • Ribose and deoxyribose
  • Nitrogenous bases and phosphate group
  • Pentose sugar and phosphate group
  • Which nitrogenous base is present in both DNA and RNA?

  • Cytosine
  • Thymine
  • Adenine (correct)
  • Guanine
  • What is the composition of a nucleotide?

  • Adenine, guanine, cytosine, thymine, and uracil
  • Purine base and pyrimidine base
  • Nitrogenous base, phosphate group, and pentose sugar (correct)
  • Ribose sugar, deoxyribose sugar, and phosphate group
  • Which type of nucleic acid contains thymine?

    <p>Deoxyribonucleic acid (DNA)</p> Signup and view all the answers

    What are the two main types of nucleic acids?

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

    Which nitrogenous base is present in RNA but not in DNA?

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

    Which type of nucleotide contains a base, sugar, and phosphate?

    <p>Deoxyguanosine monophosphate</p> Signup and view all the answers

    Which nucleotide serves as the active methyl donor?

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

    What is the function of cAMP and cGMP nucleotides?

    <p>Serve as 2nd messenger for many hormones</p> Signup and view all the answers

    Which base is present in RNA only?

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

    What type of bond links the sugar with the base in a nucleoside?

    <p>Glycosidic bond</p> Signup and view all the answers

    Which type of nucleotide enters the structure of many coenzymes such as NAD, NADP, FAD, and FMN?

    <p>Purine nucleotides</p> Signup and view all the answers

    Which nucleotide serves as the active sulfate donor?

    <p>'3'phosphoadenosine-5'-phosphosulfate</p> Signup and view all the answers

    Which nucleotide regulates the rate of oxidative phosphorylation in mitochondria?

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

    Which nucleotide enters the structure of high energy stores ATP and GTP?

    <p>Deoxyguanosine monophosphate</p> Signup and view all the answers

    What does SAM stand for and what is its function?

    <p>S-adenosyl methionine, serves as an active methyl donor.</p> Signup and view all the answers

    What type of nucleic acid structure contains a single chromosome and non-chromosomal DNA called plasmid?

    <p>Prokaryotic DNA</p> Signup and view all the answers

    What kind of bond links the monomeric nucleotides of DNA together?

    <p>Phosphodiester bond</p> Signup and view all the answers

    In the structure of DNA, which end possesses a 3hydroxyl and which end possesses a 5-phosphate?

    <p>3<code> end possesses 5</code>-phosphate, 5<code> end possesses 3</code>hydroxyl</p> Signup and view all the answers

    What is the favored configuration of the double-stranded DNA molecule?

    <p>Right handed-helix</p> Signup and view all the answers

    What represents the backbone of the axis in the structure of DNA?

    <p>Phosphate ribose molecules</p> Signup and view all the answers

    Which type of nucleotide in DNA has an anti-parallel configuration?

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

    What is the diameter of a single turn of β-DNA?

    <p>2 nm</p> Signup and view all the answers

    How many hydrogen bonds are there between G and C bases in double-stranded DNA?

    <p>3</p> Signup and view all the answers

    What is the function of the template strand in DNA?

    <p>It is copied during nucleic acid synthesis</p> Signup and view all the answers

    What is the source of information for the synthesis of all protein molecules?

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

    What type of bond links the sugar with the base in a nucleoside?

    <p>Covalent bond</p> Signup and view all the answers

    Which form of double-stranded DNA is the commonest under physiological conditions?

    <p>B-form</p> Signup and view all the answers

    How many forms does double-stranded DNA exist in?

    <p>6</p> Signup and view all the answers

    What does replication of DNA involve?

    <p>Formation of new DNA from parent DNA</p> Signup and view all the answers

    What is the width (diameter) of a single turn of β-DNA?

    <p>2 nm</p> Signup and view all the answers

    What serves as a template in the synthesis of nucleic acids?

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

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