USMLE USMLE Exam
United States Medical Licensing Examination (Page 6 )

Updated On: 7-Feb-2026

Which of the following is the mRNA start codon in most cases?

  1. UAA
  2. AGU
  3. AUG
  4. UGA

Answer(s): C



Which of the types of RNA is the smallest?

  1. mRNA
  2. tRNA
  3. rRNA

Answer(s): B



Which of the following is not considered a pyrimidine?

  1. C
  2. T
  3. U
  4. G

Answer(s): D



Which of the following is paired correctly?

  1. A-G
  2. C-G
  3. A-U
  4. G-T

Answer(s): B



Which of the following characterizes a Western blot?

  1. Antibody/protein hybridization
  2. DNA/RNA combination
  3. RNA transcription
  4. Polymerase chain reaction

Answer(s): A






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