1. A nicked RNA molecule can be ligated by

A. T4 RNA ligase
B. DNA polymerase
C. T4 DNA ligase
D. all of these

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2. The tertiary structure of yeast tRNA

A. involves extensive base stacking interactions
B. resembles the 3-dimensional structure of other tRNAs
C. is maintained mostly by non-Watson-Crick base pairing
D. all of the above

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3. Which of the following RNA characteristically contains unusual purines and pyrimidines?

A. rRNA
B. nRNA
C. mRNA
D. tRNA

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4. The anticodon is a structure on

A. mRNA.
B. tRNA.
C. aribosome.
D. rRNA.

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5. The genetic material of retroviruses such as HIV is

A. DNA
B. RNA
C. protein
D. all of these

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