DNA Nucleotide Structure Quiz Questions

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| By Will Dorsey
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Will Dorsey
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Quizzes Created: 2 | Total Attempts: 3,121
Questions: 7 | Attempts: 2,424

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Structure Of DNA Quizzes & Trivia

Questions and Answers
  • 1. 

    How many DNA molecules are in a human cell?

    • A.

      46

    • B.

      23

    • C.

      2

    • D.

      52

    Correct Answer
    A. 46
    Explanation
    In a human cell, there are 46 DNA molecules. This is because humans have 23 pairs of chromosomes, and each chromosome contains a DNA molecule. Therefore, when you add up the DNA molecules from each pair of chromosomes, you get a total of 46 DNA molecules in a human cell.

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  • 2. 

    The backbone of a DNA molecule is made up of:

    • A.

      Sugars and phosphates

    • B.

      Base-pairs

    • C.

      Adenosine triphosphate

    • D.

      Enzymes

    Correct Answer
    A. Sugars and phosphates
    Explanation
    The backbone of a DNA molecule is made up of sugars and phosphates. These sugars are called deoxyribose, and they are connected together by phosphate groups. The sugar-phosphate backbone forms a strong, stable structure that runs along the outside of the DNA molecule. The base pairs, on the other hand, are located in the interior of the DNA molecule and are responsible for carrying the genetic information. Adenosine triphosphate (ATP) and enzymes are not part of the backbone structure of DNA.

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  • 3. 

    In a DNA molecule, none of the following base-pairs are possible, EXCEPT:

    • A.

      Cytosine - Adenine

    • B.

      Guanine - Cytosine

    • C.

      Thymine - Uracil

    • D.

      Adenine - Guanine

    Correct Answer
    B. Guanine - Cytosine
    Explanation
    The base pairs in a DNA molecule are Adenine (A) with Thymine (T) and Guanine (G) with Cytosine (C). Therefore, the only base pair that is not possible is Thymine (T) with Uracil (U), as Uracil is found in RNA molecules instead of Thymine.

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  • 4. 

    Where is DNA found?

    • A.

      In the nucleus

    • B.

      In the cytoplasm

    • C.

      In endoplasmic reticulum

    • D.

      In the Golgi Apparatus

    Correct Answer
    A. In the nucleus
    Explanation
    DNA is found in the nucleus of a cell. The nucleus is the control center of the cell and contains the genetic material, including DNA. DNA is responsible for carrying the genetic instructions that determine the characteristics and functions of living organisms. It is located within the nucleus to protect it from potential damage and to ensure that it is readily available for replication and transcription processes. DNA is not found in the cytoplasm, endoplasmic reticulum, or Golgi Apparatus, as these organelles have different functions within the cell.

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  • 5. 

    All of the following are part of a DNA nucleotide, EXCEPT:

    • A.

      A ribose sugar

    • B.

      A deoxyribose sugar

    • C.

      A nitrogenous base

    • D.

      A phosphate group

    Correct Answer
    A. A ribose sugar
    Explanation
    A DNA nucleotide consists of three components: a nitrogenous base, a phosphate group, and a sugar. In DNA, the sugar is deoxyribose, not ribose. Therefore, the correct answer is a ribose sugar, which is not a part of a DNA nucleotide.

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  • 6. 

    The building blocks of nucleic acids are called:

    • A.

      Nucleotides

    • B.

      Nucleosomes

    • C.

      Nucleozymes

    • D.

      Nucleoforms

    Correct Answer
    A. Nucleotides
    Explanation
    Nucleic acids are composed of smaller units called nucleotides. These nucleotides consist of a sugar molecule, a phosphate group, and a nitrogenous base. They are the fundamental building blocks of DNA and RNA, which play crucial roles in storing and transmitting genetic information in living organisms. Nucleosomes, nucleozymes, and nucleoforms are not the correct terms for the building blocks of nucleic acids.

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  • 7. 

    Alleles are different forms of a gene. Which of the following explains how alleles differ?

    • A.

      The sequence of bases is slightly different.

    • B.

      The number of bases is slightly different.

    • C.

      The base pairs bond slightly differently.

    • D.

      The bases are attached to phosphates, not sugars.

    Correct Answer
    A. The sequence of bases is slightly different.
    Explanation
    Alleles are different forms of a gene, and they differ from each other in terms of the sequence of bases. This means that the order of the nucleotide bases (adenine, thymine, cytosine, and guanine) within the allele's DNA is slightly different. This variation in the sequence of bases is what distinguishes one allele from another and can result in different traits or characteristics being expressed.

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  • Current Version
  • Oct 12, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 14, 2014
    Quiz Created by
    Will Dorsey
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