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

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

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

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

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

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

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