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60 questions
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  • Q1
    A section of a nucleic acid is shown below The process represented in the diagram produces a molecule that is complementary to the template strand of DNA. What type of molecule is produced?
    Question Image
    Messenger RNA
    Carbohydrate
    Polypeptide
    New DNA
    60s
    BIOL.6c
  • Q2
    If several pea plants with the genotype T TYy are crossed with pea plants with the genotype Ttyy, what percentage of the offspring will be expected to have the T TYy allele combination?
    50%
    40%
    25%
    75%
    60s
    BIOL.6f
  • Q3
    A model of a DNA molecule is shown below. The arrow indicates -
    Question Image
    the bond between adjacent phosphate and deoxyribose molecules
    the hydrogen bond between complementary nucleotides
    the junction of introns and exons in the sense strand of DNA
    the junction of a codon and a DNA triplet
    60s
    BIOL.6a
  • Q4
    A codon chart is shown below. Which of these changes to the DNA triplet 3' GCT 5' will affect the protein produced?
    Question Image
    GCA
    TCC
    GTT
    TCT
    60s
    BIOL.6e
  • Q5
    Crossing-over between nonsister chromatids during meiosis is significant in heredity. This process most likely leads to an increase in which of the following?
    The occurrence of polyploidy
    Genetic variation
    The expression of dominant traits
    Number of gametes
    60s
    BIOL.6g
  • Q6
    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?
    Deoxyribose sugars
    Phosphate groups
    Nitrogenous bases
    Hydrogen bonds
    60s
    BIOL.6a
  • Q7
    In cocker spaniels the allele for a black coat color (B) is dominant over the allele for a brown coat color (b). If a brown cocker spaniel is crossed with a heterozygous black cocker spaniel, which of the following genotypic ratios can be expected?
    2 BB: 0 Bb: 2 bb
    1 BB: 2 Bb: 1 bb
    2 BB: 1 Bb: 0 bb
    0 BB: 2 Bb: 2 bb
    60s
    BIOL.6f
  • Q8
    How does DNA in cells determine an organism's complex traits?
    DNA folds into the nucleus of each of the cells of an organism
    DNA produces the energy an organism needs in order to grow
    DNA contains codes for proteins, which are necessary for the growth and functioning of an organism
    DNA separates into long single strands that make up each part of an organism
    60s
    BIOL.6a
  • Q9
    The fact that a strain of yeast with a certain defective gene can use the human version of the gene to repair itself is evidence that yeast and humans -
    both have eukaryotic cells
    depend on the same food supply
    have identical genomes
    share a genetic code
    60s
    BIOL.6b
  • Q10
    A mutation that occurs in the gametes of an organism will most likely be transferred to which of the following?
    The offspring of the organism
    The siblings of the organism
    The mating partner of the organism
    The other organisms living nearby
    60s
    BIOL.6e
  • Q11
    Early-onset Alzheimer's disease affects people under the age of 65. Less than five percent of people who are diagnosed with Alzheimer's disease have this type. Many cases of early-onset Alzheimer's disease are inherited, a type known as familial Alzheimer's disease (FAD). Which statement is best supported by this information?
    Natural selection will continue to reduce the incidence of FAD.
    FAD affects only the genes of middle-aged people.
    Deletion of one amino acid causes FAD.
    FAD is the result of a genetic change in one or more chromosomes.
    60s
    BIOL.6e
  • Q12
    Sexual reproduction in animals depends on the production of gametes. Which of these processes produces gametes in animals?
    Fertilization
    Mitosis
    Binary fission
    Meiosis
    60s
    BIOL.6g
  • Q13
    The sequence of nitrogenous bases in DNA varies widely. The sequence of the bases in DNA is most important for which of the following?
    Preventing mutations from occurring during DNA replication
    Allowing the DNA to have the shape necessary for replication
    Helping form the sugar-phosphate backbone of DNA molecules
    Providing the instructions for the traits of an organism
    60s
    BIOL.6a
  • Q14
    Four different types of cells are shown below. Which characteristic is shared by all four cells?
    Question Image
    Genetic material composed of DNA
    A mechanism for transforming sunlight into energy
    Membrane-bound organelles that transport substances
    Self-locomotion
    60s
    BIOL.6b
  • Q15
    In the 1860s Gregor Mendel performed numerous dihybrid crosses between pea plants. Dihybrid crosses involve the study of the inheritance patterns related to two different traits. In guinea pigs the allele for black fur (B) is dominant over the allele for brown fur (b), and the allele for short fur (F) is dominant over the allele for long fur (f). What percentage of the offspring from a BbFf x bbff cross would be expected to be heterozygous for both traits?
    50%
    0%
    100%
    25%
    60s
    BIOL.6f

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