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10 questions
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  • Q1
    A model of a DNA molecule is shown here. The arrow indicates-
    Question Image
    the hydrogen bond between complementary nucleotides
    the junction of entrons and exons in the sense strand of DNA
    the junction of a codon and a DNA triplet
    the bond between adjacent phosphate and deoxyribose molecules
  • Q2
    Characteristics such as a widow’s peak or attached earlobes are determined by the genetic code. Which components of DNA are referred to as the genetic code?
    Phosphate groups
    Deoxyribose sugars
    Nitrogenous bases
    Hydrogen bonds
  • Q3
    How does DNA in cells determine an organism’s complex traits?
    DNA produces the energy an organism needs in order to grow.
    DNA separates into long single strands that make up each part of an organism.
    DNA contains codes for proteins, which are necessary for the growth and functioning of an organism.
    DNA folds into the nucleus of each of the cells of an organism.
  • Q4
    The sequence of nitrogenous bases in DNA varies widely. The sequence of the bases in DNA is most important for which of the following?
    Helping form the sugar-phosphate backbone of DNA molecules
    Providing the instructions for the traits of an organism
    Preventing mutations from occurring during DNA replication
    Allowing the DNA to have the shape necessary for replication
  • Q5
    In 1952 Rosalind Franklin took the x-ray photograph shown below, which gave the world its first look at DNA. By studying this photograph, scientists gained knowledge about the-
    Question Image
    role of DNA in protein synthesis
    sequence of DNA that makes up the human genome
    double-helix structure of DNA
    mutation of nucleotide sequences in DNA
  • Q6
    A segment of DNA is represented in the illustration. How is information for a specific protein carried on the DNA molecule?
    Question Image
    As a sequence of nucleotides
    In the ratio of adenines to thymines
    In the double-helix shape of the condensed chromosome
    As a pattern of phosphates and sugars
  • Q7
    Human bone, muscle, and nerve cells all contain the same number of chromosomes with the same complement of genes. What enables these cells to perform specialized activities?
    The mutation of genes within each cell type
    The use of different methods of cell division
    The ability of some cells to remove unnecessary DNA sequences
    The regulation of gene expression within each cell type
  • Q8
    Nitrogenous bases are located on both strands of the DNA double helix. What is the significance of the nitrogenous bases?
    The amount of thymine and guanine in the DNA molecules determines the length of the genes.
    The order of nitrogenous bases determines the order of amino acids in the proteins synthesized.
    The type of hydrogen bonding between the nitrogenous bases determines which amino acid will be added to the peptide chain.
    The number of adenines and cytosines determines the type of RNA that will be produced.
  • Q9
    Eight components present in nucleic acids are listed in the box. Which components bond with adenine in a section of double-stranded DNA?
    Question Image
    2 and 4 only
    3, 4, 7, and 8 only
    1, 3, 5 and 6 only
    3 an 5 only
  • Q10
    A segment of a DNA strand is shown. 3' AGGTCAGGT 5' Which of these is the correct complementary DNA strand for the segment shown?
    5' AGGTCAGGT 3'
    5' TCCAGTCCA 3'
    5' TGGACTGGA 3'
    5' ACCUGAGGU 3'

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