Lab 4: Duchenne Muscular Dystrophy

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Questions and Answers

What is the name of the protein that is lacking in Duchenne muscular dystrophy?

  • Dystrophin (correct)
  • Hassan
  • Duchenne
  • Rasha

Why are Duchenne muscular dystrophy and Becker muscular dystrophy X-linked recessive disorders?

  • Because the gene is on a mitochondrial chromosome
  • Because the gene is on the Y chromosome
  • Because the gene is on a non-sex chromosome
  • Because the gene is on the X chromosome (correct)

At what age does Duchenne muscular dystrophy typically start showing symptoms?

  • In adulthood, around age 20
  • In infancy
  • In late childhood, around age 10
  • In early childhood, usually between ages 2 and 3 (correct)

What percentage of patients with DMD or BMD have a deletion of one or more exons?

<p>60% (B)</p> Signup and view all the answers

How many exons can be amplified simultaneously using multiplex PCR?

<p>9 (B)</p> Signup and view all the answers

What is the purpose of agarose gel electrophoresis in the diagnosis of DMD/BMD?

<p>To identify deletions in DNA (B)</p> Signup and view all the answers

What is the initial temperature set for the thermal cycler?

<p>95°C (C)</p> Signup and view all the answers

How many cycles are performed in the PCR reaction?

<p>25 cycles (D)</p> Signup and view all the answers

What is the purpose of the negative control in the PCR reaction?

<p>To check for contamination (A)</p> Signup and view all the answers

What is the concentration of ethidium bromide in the TBE running buffer?

<p>0.2 μg/mL (A)</p> Signup and view all the answers

What is the purpose of the final extension period in the PCR reaction?

<p>To allow the polymerase to fully extend the DNA (D)</p> Signup and view all the answers

How long does the electrophoresis take to complete?

<p>2 hours (B)</p> Signup and view all the answers

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