Practice Quiz

IB Biology Exam Prep - Question List

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121.
In humans, the allele for red-green colorblindness is sex-linked and recessive. For a colorblind female, which of the following statements must be true?
  1. Her mother is colorblind.
  2. Both parents carry the allele for colorblindness.
  3. Her father has normal vision.
  4. Her mother has normal vision, but is a carrier for colorblindness.
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122.
Polyploidy in an organism is most likely to result from a:
  1. Frameshift mutation that deletes a termination codon.
  2. Low level of helicase activity during DNA replication.
  3. Reciprocal exchange of material between nonsister chromatids.
  4. Chromosomal nondisjunction during meiosis.
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123.
During which phase of meiosis is crossing over most likely to occur?
  1. Prophase I
  2. Prophase II
  3. Metaphase I
  4. Metaphase II
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124.
Upon reaching a ribosome, a tRNA molecule will:
  1. Match an anticodon to the complementary mRNA codon.
  2. Attach an amino acid to the growing polypeptide chain.
  3. Eliminate introns from the mRNA sequence.
  4. Terminate the growing polypeptide chain.
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125.
Which of the following best describes an operator in prokaryotic gene expression?
  1. It is a specific nucleotide sequence that indicates where DNA replication begins.
  2. It controls access of RNA polymerase to the genes in a transcription unit.
  3. It is a transposable genetic element that activates an operon.
  4. It controls access of RNA polymerase to the genes in a transcription unit.
  5. None of the above
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