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11. Which of the following is the smallest of the RNAs?

A. Messenger RNA
B. Transfer RNAs
C. Ribosomal RNAs
D. All of these

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12. The mRNA from which of the following would contain a poly-A tail?

A. A restriction endonuclease from E. coli
B. Bacterial alpha-amylase
C. Human insulin
D. Bacteriophage DNA ligase

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13. What is the average size (in bp) of a mature tRNA?

A. 80 bp
B. 100 bp
C. 120 bp
D. 140 bp

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14. What modified base is at the 5′ extremity of a capped eukaryotic mRNA?

A. 1-methyl-adenosine
B. 2′-O-methyl-guanosine
C. 7-methyl-guanosine
D. 1-methyl-guanosine

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15. What is the function of messenger RNA?

A. It carries amino acids
B. It is a component of the ribosomes
C. It is a direct copy of a gene
D. It is the genetic material of some organisms

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