6. Which stop codon has been found to encode selenocysteine?

A. UAA
B. UAG
C. UGA
D. AGA

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7. Which of the following is a nontranslated sequence located between the transcription and the translation start site?

A. Ending frame
B. Leader sequence
C. Trailer sequence
D. Reading frame

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8. Which phage always carries a small piece of E.coli genome?

A. Lambda
B. Mu
C. T4
D. T3

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9. The final step of gene expression is protein synthesis, which is also known as

A. replication
B. translation
C. transcription
D. none of these

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10. What is the maximum number of different amino acids in a polypeptide chain coded by the synthetic polyribonucleotides (UCAG)5?

A. One
B. Two
C. Three
D. Four

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