Practice Quiz

NAEP Science Grade 12 - Question List

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186.
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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187.
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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188.
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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189.
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.
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190.
One consequence of the redundancy of the genetic code is that: 
  1. Somatic mutations do not affect the germ line.
  2. Nucleotide base deletions may lead to frameshift mutations.
  3. Some point mutations have no effect on phenotypic expression.
  4. Missense mutations may result in translocations.
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