Nucleic Acids and Nucleotides Quiz
12 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the main difference between the sugar molecules found in DNA and RNA?

  • The type of pentose sugar molecule (correct)
  • The type of nitrogenous base
  • The presence of a phosphate group
  • The presence of a hydroxyl group
  • Who is credited with identifying DNA as the carrier of genetic information?

  • Albrecht Kossel
  • Rosalind Franklin and Maurice Wilkins
  • Friedrich Miescher
  • Oswald Avery, Colin Macleod, and Maclyn McCarty (correct)
  • What is the term for the sequence of sugar-phosphate groups that form the backbone of a nucleic acid molecule?

  • Sugar-phosphate ladder
  • Nitrogenous base sequence
  • Nucleic acid backbone (correct)
  • Double helix
  • What is the name of the image that was obtained through X-ray diffraction techniques and showed the double helix structure of DNA?

    <p>Photo 51</p> Signup and view all the answers

    What is the term for the ring-shaped molecules that contain elements other than carbon and are found in nucleic acid molecules?

    <p>Heterocyclic bases</p> Signup and view all the answers

    Who is credited with discovering DNA in 1869?

    <p>Friedrich Miescher</p> Signup and view all the answers

    What is the primary function of histone proteins in the structure of chromosomes?

    <p>To provide a scaffold for the coiling of DNA</p> Signup and view all the answers

    Which type of RNA is responsible for carrying genetic information from the DNA to the site of protein synthesis?

    <p>Messenger RNA (mRNA)</p> Signup and view all the answers

    What is the term for the process by which the genetic information contained in DNA is transferred to RNA molecules and then expressed in the structure of synthesized proteins?

    <p>Central Dogma of Molecular Biology</p> Signup and view all the answers

    What is the term for the three-base sequence on a tRNA molecule that allows it to bind to mRNA during protein synthesis?

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

    What is the term for the structure composed of nucleosome coils that is approximately 30 nm in diameter?

    <p>Chromatin fiber</p> Signup and view all the answers

    Which of the following types of viruses is characterized by its helical morphology?

    <p>Helical virus</p> Signup and view all the answers

    Study Notes

    Nucleic Acids

    • Unbranched polymers containing monomer units called nucleotides
    • Types: Deoxyribonucleic acid (DNA) and Ribonucleic acid (RNA)

    Nucleotides

    • A three-subunit molecule consisting of:
      • A pentose sugar
      • A phosphate group
      • A nitrogen-containing heterocyclic base
    • Heterocyclic bases:
      • Purine: Adenine (A) and Guanine (G)
      • Pyrimidine: Cytosine (C), Thymine (T), and Uracil (U)

    Sugar

    • A pentose ring that may or may not lose a hydroxyl group
    • Types:
      • D-ribose (in RNA)
      • D-deoxyribose (in DNA)

    Phosphate

    • Derived from phosphoric acid (H3PO4)

    History of Nucleic Acids

    • 1869: Friedrich Miescher discovered DNA in pus of discarded surgical bandages and named it "nuclein"
    • 1878: Albrecht Kossel isolated pure nucleic acid
    • 1943: Oswald Avery, Colin Macleod, and Maclyn McCarty identified DNA as the carrier of genetic information

    DNA Structure

    • A double helix consisting of two complementary nucleic acid strands coiled around a common axis
    • Developed by James Watson and Francis Crick in 1953
    • Nucleic acid backbone on the outside, heterocyclic bases on the inside
    • Chains run in opposite directions
    • Specific base pairing: Adenine (A) pairs with Thymine (T), and Guanine (G) pairs with Cytosine (C)

    Chromatin Structure

    • Nucleosome: made up of histone proteins and DNA strand wrapped twice around it
    • 30 nm chromatin fiber: composed of nucleosome coils
    • Chromosome: packed DNA commonly seen during M phase

    RNA

    • A long unbranched polymer consisting of nucleotides joined by 3’ to 5’ phosphodiester bonds
    • Some RNA strands can form intramolecular base pairing
    • Kinds of RNA:
      • Messenger RNA (mRNA): carrier of genetic information
      • Ribosomal RNA (rRNA): main component of ribosomes
      • Transfer RNA (tRNA): delivers individual amino acids to the site of protein synthesis

    Viruses

    • Acellular infectious particles
    • Virion: an intact and infective virus particle
    • Types based on morphology:
      • Helical
      • Polyhedral
      • Envelope
      • Complex

    Central Dogma of Molecular Biology

    • The genetic information contained in DNA is transferred to RNA molecules and then expressed in the structure of synthesized proteins

    Genes

    • Segments of DNA that contain the information needed for the synthesis of proteins

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Test your knowledge on nucleic acids, nucleotides, and heterocyclic bases with this quiz. Learn about the structure and types of nucleic acids such as DNA and RNA, as well as the components of nucleotides.

    More Like This

    Use Quizgecko on...
    Browser
    Browser