22. There are 20 amino acids and 64 possible codons. Which of the following is closer to the actual number of different tRNA molecules in a cell?
A. 4
B. 16
C. 20
D. 61
E. 64
23. There are 20 amino acids and 64 possible codons. How many different eukaryotic aminoacyltRNA synthetases are there? A. 1
B. 16
C. 20
D. 61
E. 64
24. Which way are the amino acid and tRNA attached in a charged tRNA?
A. Amino acid-5'tRNA3'-AMP B
. Amino acid-AMP-3'tRNA
C. AMP-amino acid-3'tRNA
D. Amino acid-3'tRNA5'-AMP
E. Amino acid-AMP-5'tRNA
25. The anticodon that recognizes the initiation codon in translation is
A. 5' AUG 3'
B. 3' AUG 5'
C. 5' ACU 3'
D. 5' UAC 3'
E. 3' UAC 5'
26. The first amino acid incorporated into a growing polypeptide
A. In bacteria is methionine and it is also methionine in eukaryotes
B. In bacteria is tryptophan, while it is methionine in eukaryotes
C. In bacteria is N-formyl methionine, while it is methionine in eukaryotes
D. In bacteria is N-formyl methionine and it is also N-formyl methionine in eukaryotes
E. In bacteria is methionine, while it is N-formyl methionine in eukaryotes
27. In E. coli the IF3 forces tRNAf Met to bind with
A. The A site of the ribosome
B. The P site of the ribosome
C. The E site of the ribosome
D. IF1
E. IF2