#Question id: 4152
#Section 3: Genetics, Cellular and Molecular Biology
The pathway for polypeptides exported from E. coli includes the following steps, which occur in what order for correct export?
1. A chaperone, SecA, binds to the polypeptide.
2. A chaperone, SecB, binds to the polypeptide.
3. ATP is hydrolyzed by Sec A.
4. SecA pushes 20 amino acids of the polypeptide into the translocation complex.
#Question id: 4153
#Section 3: Genetics, Cellular and Molecular Biology
Ubiquitin-mediated protein degradation is a complex process, and many of the signals remain unknown. One known signal involves recognition of amino acids in a processed protein that are either stabilizing (Ala, Gly, Met, Ser, etc.) or destabilizing (Arg, Asp, Leu, Lys, Phe, etc.), and are located at:
#Question id: 4155
#Section 3: Genetics, Cellular and Molecular Biology
Of all the possible triplet codons, __ do not code for an amino acid.
#Question id: 4156
#Section 3: Genetics, Cellular and Molecular Biology
The reading frame of DNA is fixed by
#Question id: 4157
#Section 3: Genetics, Cellular and Molecular Biology
At the ribosome, the codon and anticodon associate by __.
#Question id: 4158
#Section 3: Genetics, Cellular and Molecular Biology
What is a reasonable number of nucleotides in a tRNA molecule?