Competitive Exams: Medical Science MCQs (Practice_Test 9 of 135)

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1. Which of the following is the mRNA start codon in most cases?
   1. UAA
   2. AGU
   3. AUG
   4. UGA

   Answer: c

2. Which of the types of RNA is the smallest?
   1. mRNA
   2. tRNA
   3. rRNA

   Answer: b

3. Which of the following is not considered a pyrimidine?
   1. C
   2. T
   3. U
   4. G

   Answer: d

4. Which of the following is paired correctly?
   1. A-G
   2. C-G
   3. A-U
   4. G-T

   Answer: b

5. Which of the following characterizes a Western blot?
   1. Antibody/protein hybridization
   2. DNA/RNA combination
   3. RNA transcription
   4. Polymerase chain reaction

   Answer: a

6. Which of the following is the approximate prevalence ratio for cystic fibrosis?
   1. 1: 25,000
   2. 1: 5,000
   3. 1: 2,000
   4. 1: 800

   Answer: c

7. Which of the following divisions of cell growth precedes Mitosis in the cell cycle?
   1. G
   2. G
   3. S
   4. G0

   Answer: a

8. Down syndrome is directly linked to a genetic abnormality of chromosome?
   1. XXII
   2. XXI
   3. XIIX
   4. XV

   Answer: b

9. Which of the following is a characteristic of the Hardy-Weinberg law?
   1. Mating between species occurs at a set rate.
   2. Migration is a considerable factor.
   3. Mutation occurs at the locus
   4. Genotype selection does not occur at the locus

   Answer: d

10. Which of the following is not a characteristic of Hurler՚s syndrome?
    1. Autosomal recessive condition
    2. Associated with delayed mental development
    3. Spasticity
    4. Corneal deficits

    Answer: c