11. Which of the following is the smallest of the RNAs?
A. Messenger RNA
B. Transfer RNAs
C. Ribosomal RNAs
D. All of these
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
13. What is the average size (in bp) of a mature tRNA?
A. 80 bp
B. 100 bp
C. 120 bp
D. 140 bp
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
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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