Molecular Basis of Inheritance

Topics in this chapter

• DNA Structure, Replication and Packaging
• Genetic Material Experiments and DNA Analysis
• Transcription and mRNA Processing
• Lac Operon and Gene Regulation
• Genetic Code and Translation

Cheat sheet

Practice questions

1. Question 1Q-6DF1B6

   Which of the following chemical components is completely absent in a standard RNA molecule?

   1. A.Adenine
   2. B.Thymine
   3. C.Uracil
   4. D.Ribose sugar
   See the answer and solution
2. Question 2Q-EF56D6

   In the Meselson and Stahl experiment, $^{15}N$ was incorporated into E. coli DNA by growing them for many generations in a medium containing:

   1. A.$^{15}NH_4Cl$
   2. B.$Na^{15}NO_3$
   3. C.$^{15}N_2$ gas
   4. D.Choline-$^{15}N$
   See the answer and solution
3. Question 3Q-B6E853

   During DNA replication, the discontinuously synthesized fragments on the lagging strand are eventually joined together by which enzyme?

   1. A.DNA polymerase I
   2. B.RNA primase
   3. C.DNA ligase
   4. D.Helicase
   See the answer and solution
4. Question 4Q-F3572E

   In the lac operon of E. coli, the z gene codes for which of the following enzymes?

   1. A.Permease
   2. B.beta-galactosidase
   3. C.Transacetylase
   4. D.RNA polymerase
   See the answer and solution
5. Question 5Q-E45AE3

   Which of the following features of the genetic code indicates that a single amino acid can be coded by multiple codons?

   1. A.Ambiguous
   2. B.Degenerate
   3. C.Universal
   4. D.Non-overlapping
   See the answer and solution