Practice Quiz

MTEL Biology Practice Exam - Question List

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61.
Which of the following best describes how muscle fibers contract?
  1. Actin filaments shorten during the early phase of contraction, and myosin filaments shorten during the later phase of contraction.
  2. Actin filaments shorten during the early phase of contraction, and myosin filaments shorten during the later phase of contraction.
  3. Actin and myosin filaments wind tightly around each other during contraction, which shortens their lengths.
  4. Actin filaments shorten during contraction, while myosin fibers stretch.
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62.
The stratum corneum tissue of human skin consists mainly of dead cells that are continuously sloughed off and replaced by new cells migrating from underlying layers. This characteristic of the stratum corneum is most directly related to the skin’s ability to:
  1. Maintain elasticity and tone in underlying muscle and connective tissue.
  2. Provide a continuous supply of leukocytes as part of the innate immune response.
  3. Replenish worn and damaged sensors of the peripheral nervous system.
  4. Protect against injury and serve as a barrier against the entry of pathogens.
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63.
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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64.
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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65.
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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