Competitive Exams: Medical Science MCQs (Practice-Test 9 of 135)

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